High dam large reservoir desilting ratio calculation method and device, computer equipment and storage medium

Abstract

The invention provides a high dam large reservoir desilting ratio calculation method and device, computer equipment and a storage medium. The method comprises the steps that a flood season reservoir desilting ratio theoretical value and a non-flood season reservoir desilting ratio theoretical value are calculated; correcting the theoretical value of the reservoir desilting ratio in the flood season and the theoretical value of the reservoir desilting ratio in the non-flood season by using the correction parameter of the annual reservoir-in / out sand content coefficient to obtain a corrected value of the reservoir desilting ratio in the flood season and a corrected value of the reservoir desilting ratio in the non-flood season; and weighting the reservoir desilting ratio correction value by using the flood season desilting ratio weight coefficient and the non-flood season desilting ratio weight coefficient, and calculating to obtain the annual reservoir desilting ratio of the reservoir. The reservoir desilting ratio is corrected by correcting the reservoir in-out reservoir desilting ratio coefficient, the reliability of the reservoir desilting ratio can be guaranteed, and the calculation process of the reservoir desilting ratio is simplified; weighted calculation is carried out on the reservoir desilting ratio in the flood season and the reservoir desilting ratio in the non-flood season, and the influence of the operation modes of the reservoirs in the flood season and the non-flood season on the inter-annual desilting effect is revealed.

Description

Technical Field

[0001] The invention relates to the technical field of reservoir dam sediment discharge ratio calculation, and in particular to a high dam and large reservoir sediment discharge ratio calculation method, device, computer equipment and storage medium. Background Art

[0002] The sediment discharge ratio of a reservoir is a key indicator to measure the sediment interception effect of reservoir operation, and it has important guiding significance for reservoir siltation evaluation and sediment control. The sediment discharge ratio of a reservoir is defined as the ratio of the amount of sediment discharged from the reservoir to the amount of sediment entered during the same period of time. In order to analyze the sediment discharge ratio of a reservoir under different scenarios, it is urgent to establish a quantitative relationship between the reservoir sediment discharge ratio and various influencing factors. The influencing factors of the reservoir sediment discharge ratio include: geographical conditions of the reservoir area, water and sediment conditions entering the reservoir, and reservoir operation mode. The geographical conditions of the reservoir area include: basin area, basin erosion modulus, river channel gradient, etc.; the water and sediment conditions entering the reservoir include: inflow water volume, flow, sand volume, sediment content, sediment coefficient, suspended sediment particle size, etc.; the reservoir operation mode conditions include: reservoir capacity, water level changes in front of the dam, backwater length of the reservoir area, outflow flow, backwater operation time, flood discharge duration, etc. Due to the large number of influencing factors of the reservoir sediment discharge ratio, the empirical expressions of the reservoir sediment discharge ratio vary greatly under different basins, time scales, and reservoir operation conditions.

[15] .

[0003] The variation patterns of reservoir sediment discharge ratio at interannual, flood season and non-flood season scales are summarized respectively. Existing studies have shown that: at the multi-year scale, the reservoir operates in a mode of storing clear water and discharging turbid water, and the reservoir sediment discharge ratio is mainly related to the detention time (the ratio of reservoir storage capacity to inflow water volume) and the inflow and outflow water volume coefficient (the ratio of outflow water volume to inflow water volume); at the flood season and non-flood season scale, the reservoir sediment discharge methods include surface and middle hole sediment discharge, and bottom hole sediment discharge. When the surface and middle holes are discharged, the reservoir sediment discharge ratio is only a function of the detention time, while when the bottom holes are discharged, the main influencing factors of the reservoir sediment discharge ratio are the detention time, the inflow and outflow flow coefficient, and the river gradient of the reservoir area. [16-18] For high dams and large reservoirs, the sediment discharge method is surface and middle holes. Therefore, the expression of reservoir sediment discharge ratio between the year, flood season and non-flood season is a function of the retention time and the coefficient of water volume in and out of the reservoir.

[0004]

[0005] η is the sediment discharge ratio of the reservoir, Q out is the outflow water volume (billion m 3 ), Q in is the amount of water entering the reservoir (billion m 3 ), V is the total storage capacity of the reservoir (billion m 3 ). Existing studies have used residence time (V / Q in ) represents the reservoir's ability to intercept and store incoming sediment, and the inflow and outflow water coefficient (Q out / Q in) characterizes the reservoir’s discharge and sediment removal capacity, but it does not take into account the impact of the reservoir’s effective storage capacity reduction under long-term operation conditions, which leads to an increase in the reservoir’s sediment removal capacity and thus affects the reservoir’s sediment removal ratio.

[0006] Because the reservoir sediment discharge ratio is closely related to many influencing factors under different time scales, and the physical connection between the reservoir sediment discharge ratio and the retention time and the inflow and outflow water coefficient is still unclear, the empirical expression of the reservoir sediment discharge ratio lacks a unified formula form. In addition, current research has rarely considered the impact of the dynamic change of reservoir storage capacity on the reservoir sediment discharge ratio, resulting in poor calculation accuracy of the empirical formula of the reservoir sediment discharge ratio on a multi-year scale. Summary of the invention

[0007] Based on this, it is necessary to provide a method, device, computer equipment and storage medium for calculating the sediment discharge ratio of a high dam and a large reservoir in response to the above-mentioned technical problems.

[0008] In a first aspect, the present disclosure provides a method for calculating the sediment discharge ratio of a high dam and a large reservoir, comprising:

[0009] Obtain the water volume coefficients for inflow and outflow during the flood season, the water volume coefficients for inflow and outflow during the non-flood season, the sediment content coefficients for inflow and outflow during the flood season, and the sediment content coefficients for inflow and outflow during the non-flood season;

[0010] According to the flood season inflow and outflow water coefficient, the non-flood season inflow and outflow water coefficient, the flood season inflow and outflow sediment content coefficient and the non-flood season inflow and outflow sediment content coefficient, respectively calculate the flood season reservoir sediment discharge ratio theoretical value and the non-flood season reservoir sediment discharge ratio theoretical value;

[0011] Obtain the correction parameters of the annual inflow and outflow sediment content coefficient;

[0012] The theoretical value of sediment discharge ratio of the reservoir in the flood season and the theoretical value of sediment discharge ratio of the reservoir in the non-flood season are corrected by using the correction parameter of the annual inflow and outflow sediment content coefficient to obtain the corrected value of sediment discharge ratio of the reservoir in the flood season and the corrected value of sediment discharge ratio of the reservoir in the non-flood season;

[0013] Obtain the weight coefficient of sediment discharge ratio in flood season and the weight coefficient of sediment discharge ratio in non-flood season;

[0014] The revised value of the reservoir sediment discharge ratio in the flood season is weighted by the flood season sediment discharge ratio weight coefficient, and the revised value of the reservoir sediment discharge ratio in the non-flood season is weighted by the non-flood season sediment discharge ratio weight coefficient. The annual reservoir sediment discharge ratio of the reservoir is calculated based on the weighted revised value of the reservoir sediment discharge ratio in the flood season and the weighted revised value of the reservoir sediment discharge ratio in the non-flood season.

[0015] In one embodiment, the step of obtaining the correction parameter of the annual inflow and outflow sediment content coefficient includes:

[0016] Obtain the annual inflow and outflow sediment content coefficient;

[0017] Obtain the empirical value of the annual inflow and outflow sediment content coefficient;

[0018] According to the empirical value of the annual in-and-out sediment content coefficient and the annual in-and-out sediment content coefficient, the correction parameter of the annual in-and-out sediment content coefficient is calculated.

[0019] In one embodiment, the step of obtaining the annual inflow and outflow sediment content coefficient includes:

[0020] The theoretical value of the annual sediment discharge ratio of the reservoir is calculated using a one-dimensional water-sediment model;

[0021] The annual sediment discharge ratio theoretical value is converted into the annual in-and-out sediment content coefficient by using the reservoir sediment discharge ratio calculation formula.

[0022] In one embodiment, the step of obtaining the empirical value of the annual inflow and outflow sediment content coefficient includes:

[0023] The empirical value of the annual inflow and outflow sediment content coefficient is calculated using Siyam's empirical formula.

[0024] In one embodiment, the step of using the correction parameter of the annual inflow and outflow sediment content coefficient to correct the theoretical value of the sediment discharge ratio of the flood season reservoir and the theoretical value of the sediment discharge ratio of the non-flood season reservoir to obtain the corrected value of the sediment discharge ratio of the flood season reservoir and the corrected value of the sediment discharge ratio of the non-flood season reservoir includes:

[0025] Obtain correction parameters for the sediment content coefficients of the reservoir in and out during the flood season and the sediment content coefficients of the reservoir in and out during the non-flood season;

[0026] The theoretical value of the reservoir sediment discharge ratio during the flood season is corrected by using the correction parameters of the annual inflow and outflow sediment content coefficient and the correction parameters of the inflow and outflow sediment content coefficient during the flood season to obtain the corrected value of the reservoir sediment discharge ratio during the flood season.

[0027] The theoretical value of the sediment discharge ratio of the reservoir in the non-flood season is corrected by using the correction parameters of the annual inflow and outflow sediment content coefficient and the correction parameters of the inflow and outflow sediment content coefficient in the non-flood season to obtain the correction value of the sediment discharge ratio of the reservoir in the non-flood season.

[0028] In one embodiment, the step of obtaining the weight coefficient of the sediment discharge ratio in the flood season and the weight coefficient of the sediment discharge ratio in the non-flood season comprises:

[0029] Obtain the annual inflow of sediment, the inflow of sediment during the flood season, and the inflow of sediment during the non-flood season;

[0030] The proportion of the inflow of sand in the flood season is calculated based on the inflow of sand in the flood season and the annual inflow of sand, and the proportion of the inflow of sand in the non-flood season is calculated based on the inflow of sand in the non-flood season and the annual inflow of sand;

[0031] The weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the flood season and the sediment content coefficient entering and leaving the reservoir during the flood season, and the weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the non-flood season and the sediment content coefficient entering and leaving the reservoir during the non-flood season.

[0032] In a second aspect, the present disclosure provides a device for calculating sediment discharge ratio of a high dam and a large reservoir, comprising:

[0033] The flood season and non-flood season coefficient acquisition module is used to obtain the flood season in-and-out reservoir water volume coefficient, the non-flood season in-and-out reservoir water volume coefficient, the flood season in-and-out reservoir sediment content coefficient, and the non-flood season in-and-out reservoir sediment content coefficient;

[0034] The flood season and non-flood season sediment discharge ratio calculation module is used to calculate the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season according to the inlet and outlet water volume coefficient and the inlet and outlet sediment content coefficient;

[0035] A correction parameter acquisition module is used to obtain correction parameters of the annual inflow and outflow sediment content coefficient;

[0036] A correction module, used to correct the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season by using the correction parameter of the annual inflow and outflow sediment content coefficient, so as to obtain the corrected value of the sediment discharge ratio of the reservoir in the flood season and the corrected value of the sediment discharge ratio of the reservoir in the non-flood season;

[0037] The weighted coefficient acquisition module is used to obtain the weighted coefficient of the sediment discharge ratio in the flood season and the weighted coefficient of the sediment discharge ratio in the non-flood season;

[0038] The annual reservoir sediment discharge ratio calculation module is used to weight the flood season reservoir sediment discharge ratio correction value using the flood season sediment discharge ratio weight coefficient, and to weight the non-flood season reservoir sediment discharge ratio correction value using the non-flood season sediment discharge ratio weight coefficient to obtain the reservoir's annual reservoir sediment discharge ratio.

[0039] In a third aspect, the present disclosure provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above aspects.

[0040] In a fourth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method described in the above aspects when executed by a processor.

[0041] In a fifth aspect, the present disclosure provides a computer program product, including a computer program, which implements the steps of the method described in the above aspects when executed by a processor.

[0042] The above-mentioned method, device, computer equipment and storage medium for calculating the sediment discharge ratio of high dams and large reservoirs can ensure the reliability of the calculation results of the reservoir sediment discharge ratio and greatly simplify the calculation process of the reservoir sediment discharge ratio by correcting the sediment content coefficient of the reservoir in and out, so as to correct the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season; in addition, based on the conservation relationship between the annual inflow and outflow of water and sediment and the inflow and outflow of water and sediment in the flood season and the non-flood season, it is proposed to perform weighted calculation of the sediment discharge ratio of the reservoir in the flood season and the sediment discharge ratio of the reservoir in the non-flood season, thereby revealing the influence of the operation mode of the reservoir in the flood season and the non-flood season on the inter-annual sediment discharge effect, which can provide a theoretical basis for the efficient sediment discharge of the reservoir, thereby making the calculation result of the sediment discharge ratio more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1A A schematic diagram of a flow chart of a method for calculating a sediment discharge ratio of a high dam and a large reservoir in one embodiment;

[0044] Figure 1B A schematic flow chart of a method for calculating the sediment discharge ratio of a high dam and a large reservoir in another embodiment;

[0045] Figure 2 A schematic diagram of verifying the calculation results of the one-dimensional water-sediment model for the siltation of Xiluodu and Xiangjiaba reservoirs in an embodiment;

[0046] Figure 3 The sedimentation process of the cascade reservoirs in the lower reaches of the Jinsha River in the next 100 years in one embodiment;

[0047] Figure 4 A comparison of the calculation results of sediment discharge ratio of the cascade reservoirs in the lower reaches of the Jinsha River in an embodiment;

[0048] Figure 5 It is a schematic diagram of the variation law of the correction coefficient of the inflow and outflow of the sediment content of the cascade reservoirs in the lower reaches of the Jinsha River from 2021 to 2120 in an embodiment;

[0049] Figure 6 It is a theoretical value of the sediment discharge ratio between the flood season and the non-flood season of the cascade reservoirs in the lower reaches of the Jinsha River in the next 100 years calculated in an embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] Embodiment 1

[0052] In this embodiment, Figure 1A As shown, a method for calculating the sediment discharge ratio of a high dam and a large reservoir is provided, which includes:

[0053] Step 110, obtaining the flood season in-and-out water volume coefficient, the non-flood season in-and-out water volume coefficient, the flood season in-and-out sediment content coefficient, and the non-flood season in-and-out sediment content coefficient.

[0054] In this embodiment, the flood season in-and-out water volume coefficient is the ratio of the flood season out-water volume to the flood season in-water volume, the non-flood season in-and-out water volume coefficient is the ratio of the non-flood season out-water volume to the non-flood season in-water volume, the flood season in-and-out sediment content coefficient is the ratio of the flood season out-water content to the flood season in-water content, and the non-flood season in-and-out sediment content coefficient is the ratio of the non-flood season out-water content to the non-flood season in-water content.

[0055] Step 120, respectively calculating a theoretical value of the sediment discharge ratio of the reservoir in the flood season and a theoretical value of the sediment discharge ratio of the reservoir in the non-flood season according to the flood season inlet and outlet water volume coefficient, the non-flood season inlet and outlet water volume coefficient, the flood season inlet and outlet sediment content coefficient, and the non-flood season inlet and outlet sediment content coefficient.

[0056] Step 130, obtaining correction parameters for the annual inflow and outflow sediment content coefficient.

[0057] Step 140, using the correction parameter of the annual inflow and outflow sediment content coefficient, correct the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season to obtain the corrected value of the sediment discharge ratio of the reservoir in the flood season and the corrected value of the sediment discharge ratio of the reservoir in the non-flood season.

[0058] In this embodiment, the theoretical values ​​of sediment discharge ratios of the reservoir in the flood season and the non-flood season are calculated by combining the inflow and outflow water volume coefficients and the inflow and outflow sediment content coefficients in the flood season and the non-flood season, respectively, and the theoretical values ​​of sediment discharge ratios are corrected using the correction parameters of the annual inflow and outflow sediment content coefficients:

[0059]

[0060] Among them, η1(t) and η2(t) are the theoretical values ​​of sediment discharge ratio in the flood season and the non-flood season of the reservoir in the tth year, respectively. are the water volume entering the reservoir during the flood season and the water volume entering the reservoir during the non-flood season in year t (billion m 3 ), are the water volume discharged from the reservoir in the flood season and the water volume discharged in the non-flood season in year t (billion m 3 ), a and 1-b are correction parameters respectively.

[0061] In the above process, the theoretical value of sediment discharge ratio is corrected by using the correction parameters a and 1-b of the annual inflow and outflow sediment content coefficient to obtain the corrected flood season reservoir sediment discharge ratio correction value η1(t) and the non-flood season reservoir sediment discharge ratio correction value η2(t).

[0062] Step 150, obtaining a weight coefficient of the sediment discharge ratio in the flood season and a weight coefficient of the sediment discharge ratio in the non-flood season.

[0063] In this embodiment, according to the conservation relationship between the annual inflow and outflow of water and sediment and the inflow and outflow of water and sediment during the flood season and the non-flood season, the annual outflow of water and sediment is the sum of the outflow of water and sediment during the flood season and the outflow of water and sediment during the non-flood season, and the annual inflow of water and sediment is the sum of the inflow of water and sediment during the flood season and the inflow of water and sediment during the non-flood season. Therefore, the reservoir operation mode during the flood season and the non-flood season is different, and its impact on the inter-annual sediment discharge effect is also different. Therefore, different weights can be assigned to the flood season and the non-flood season. Therefore, in this embodiment, the weight coefficient of the sediment discharge ratio during the flood season and the weight coefficient of the sediment discharge ratio during the non-flood season are obtained to weight the sediment discharge ratio of the reservoir during the flood season and the sediment discharge ratio of the reservoir during the non-flood season.

[0064] Step 160, weighting the revised value of the reservoir sediment discharge ratio in the flood season by using the weight coefficient of the flood season sediment discharge ratio, weighting the revised value of the reservoir sediment discharge ratio in the non-flood season by using the weight coefficient of the non-flood season sediment discharge ratio, and calculating the reservoir sediment discharge ratio for the whole year according to the weighted revised value of the reservoir sediment discharge ratio in the flood season and the weighted revised value of the reservoir sediment discharge ratio in the non-flood season.

[0065] In this embodiment, the weight coefficient of the sediment discharge ratio in the flood season and the weight coefficient of the sediment discharge ratio in the non-flood season are used to respectively perform correction calculations on the revised sediment discharge ratio correction value of the reservoir in the flood season and the revised sediment discharge ratio correction value of the reservoir in the non-flood season:

[0066]

[0067] Among them, w1 and w2 are the weight coefficients of reservoir sediment discharge ratio in flood season and non-flood season respectively, and η(t) is the annual reservoir sediment discharge ratio of the reservoir in the tth year.

[0068] In the above embodiment, the theoretical values ​​of the sediment discharge ratio of the reservoir in the flood season and the theoretical values ​​of the sediment discharge ratio of the reservoir in the non-flood season are corrected by correcting the sediment content coefficient of the reservoir in and out, which can ensure the reliability of the calculation results of the reservoir sediment discharge ratio and greatly simplify the calculation process of the reservoir sediment discharge ratio; in addition, based on the conservation relationship between the annual inflow and outflow of water and sediment and the inflow and outflow of water and sediment in the flood season and non-flood season, it is proposed to perform weighted calculation of the sediment discharge ratio of the reservoir in the flood season and the sediment discharge ratio of the reservoir in the non-flood season, thereby revealing the influence of the operation mode of the reservoir in the flood season and the non-flood season on the inter-annual sediment discharge effect, which can provide a theoretical basis for the efficient sediment discharge of the reservoir, thereby making the calculation result of the sediment discharge ratio more accurate.

[0069] Embodiment 2

[0070] On the basis of the above embodiment, in this embodiment, the step of obtaining the correction parameter of the annual inflow and outflow sediment content coefficient includes:

[0071] Obtain an annual in-and-out sediment content coefficient; obtain an empirical value of the annual in-and-out sediment content coefficient; and calculate a correction parameter of the annual in-and-out sediment content coefficient based on the empirical value of the annual in-and-out sediment content coefficient and the annual in-and-out sediment content coefficient.

[0072] In this embodiment, since the empirical value of the annual in-and-out sediment content coefficient is calculated by an empirical formula, the calculation process does not take into account the increase in the sediment discharge capacity of the reservoir when the effective storage capacity of the reservoir decreases, resulting in a smaller empirical value of the annual in-and-out sediment content coefficient in the later stage of reservoir operation. Therefore, it is necessary to use the annual in-and-out sediment content coefficient to correct the empirical value of the annual in-and-out sediment content coefficient.

[0073] η(t)=k'×η'(t)

[0074] k' is the correction term for the in-and-out sediment content coefficient, η'(t) is the empirical value of the annual sediment discharge ratio, η(t) is the annual sediment discharge ratio of the annual reservoir, and the correction term for the in-and-out sediment content coefficient is the correction parameter for the annual in-and-out sediment content coefficient. Using the reservoir sediment discharge ratio calculation formula, the annual sediment discharge ratio empirical value can be converted into the annual in-and-out sediment content coefficient empirical value, and the annual sediment discharge ratio can be converted into the annual in-and-out sediment content coefficient. In order to characterize the impact of changes in the effective storage capacity of the reservoir on the in-and-out sediment content coefficient, an adaptive model of the correction term for the in-and-out sediment content coefficient and the theoretical value of the reservoir sediment discharge ratio is established. As the reservoir operation time continues to increase and the effective storage capacity continues to decrease, the closer the reservoir is to the scouring and silting balance condition, the larger the reservoir sediment discharge ratio, and the larger the correction term for the in-and-out sediment content coefficient. Therefore, the correction parameter for the annual in-and-out sediment content coefficient can be obtained:

[0075] k'=a×[η(t)] b (14)

[0076] a and b are dimensionless parameters. After simplification, the modified form of the in-and-out sediment content coefficient is obtained.

[0077] Embodiment 3

[0078] Based on the above embodiment, in this embodiment, the step of obtaining the annual inflow and outflow sediment content coefficient includes:

[0079] The one-dimensional water-sediment model is used to calculate the theoretical value of the annual sediment discharge ratio of the reservoir; the annual sediment discharge ratio theoretical value is converted into the annual in-and-out sediment content coefficient using the reservoir sediment discharge ratio calculation formula.

[0080] In this embodiment, a one-dimensional water-sediment model equation group for reservoir sedimentation calculation is established based on the non-equilibrium unbalanced sediment transport theory, including the water flow continuity equation, the water flow motion equation, the water flow sediment entrainment force equation, the bed load sediment transport rate equation, and the riverbed deformation equation. The water flow continuity equation, the water flow motion equation, the water flow sediment entrainment force equation, the bed load sediment transport rate equation, and the riverbed deformation equation are as follows:

[0081]

[0082] Where q is the flow rate (m 3 / s), x is the longitudinal migration distance of the river channel (m), h is the water level (m), J is the hydraulic gradient, n is the roughness of the river channel, B is the width of the river channel (m), U is the average flow velocity of the river (m / s), S * is the sand-carrying force of the water flow (kg / m 3 ), ω is the sediment settling velocity (m / s), k is the water flow sediment entrainment coefficient, m is the water flow sediment entrainment index, q b is the sediment transport rate of river load (kg / m 3 ), d is the particle size of bedload sediment (m), V b is the friction velocity of the river, K b and m b are the coefficient and exponent of the bed load transport rate formula, S is the suspended sediment content in the river channel (kg / m 3 ), α is the saturation coefficient of suspended sediment along the way.

[0083] The theoretical value of the annual sediment discharge ratio of the reservoir is calculated using the one-dimensional water-sediment model:

[0084]

[0085] S r is the sediment content in the reservoir area (kg / m 3 ), q out is the outbound flow (m 3 / s), S in is the sediment content of the river entering the reservoir (kg / m 3 ), q in is the inflow flow (m 3 / s).

[0086] It should be understood that the water-sediment material conservation relationship shows that the reservoir sediment discharge ratio is the product of the in-and-out water volume coefficient and the in-and-out sediment content coefficient. Therefore, in this embodiment, in combination with the water-sediment material conservation relationship, the reservoir sediment discharge ratio definition formula (reservoir sediment discharge ratio calculation formula) is converted into the product of the in-and-out water volume coefficient and the in-and-out sediment content coefficient:

[0087]

[0088] η(t) is the theoretical value of the reservoir sediment discharge ratio in the tth year, λ1(t) is the water volume coefficient of the reservoir in and out in the tth year, λ2(t) is the sediment content coefficient of the reservoir in and out in the tth year, S out (t) is the sediment content discharged from the reservoir in year t (kg / m 3 ), S in (t) is the sediment content entering the reservoir in year t (kg / m 3 ), Q out (t) is the water volume discharged from the reservoir in year t (billion m 3 ), Q in (t) is the amount of water entering the reservoir in year t (billion m 3). Since the outflow and inflow water volume are equal under annual scale conditions, the inflow and outflow water volume coefficient is 1, and the annual reservoir sediment discharge ratio is the inflow and outflow sediment content coefficient.

[0089] Therefore, using the reservoir sediment discharge ratio calculation formula, the annual sediment discharge ratio theoretical value can be converted into the annual inflow and outflow sediment content coefficient.

[0090] In this embodiment, by analyzing the physical meaning of the reservoir sediment discharge ratio definition formula and correcting the reservoir inlet and outlet sediment content coefficient, the reliability of the reservoir sediment discharge ratio empirical expression can be ensured and the calculation process of the reservoir sediment discharge ratio can be greatly simplified.

[0091] Embodiment 4

[0092] On the basis of the above-mentioned embodiment, in this embodiment, the step of obtaining the empirical value of the annual in-and-out sediment content coefficient includes: using Siyam's empirical formula to calculate and obtain the empirical value of the annual in-and-out sediment content coefficient.

[0093] In this embodiment, the Siyam empirical formula is used to calculate the empirical value of the annual inflow and outflow sediment content coefficient in combination with the inflow water volume and the effective storage capacity of the reservoir:

[0094]

[0095] V e (t) = V e (t-1)-S in (t-1)×Q in (t-1)×[1-η'(t-1)] / ρ'

[0096] η'(t) is the empirical value of reservoir sediment discharge ratio in year t, η'(t-1) is the empirical value of reservoir sediment discharge ratio in year t-1, V e (t) is the effective storage capacity of the reservoir in year t (100 million m3), V e (t-1) is the effective storage capacity of the reservoir in year t-1 (100 million m3), S in (t-1) is the sediment content entering the reservoir in year t (kg / m 3 ), Q in (t-1) is the amount of water entering the reservoir in year t-1 (billion m 3 ), ρ' is the density of sediment deposited in the reservoir area (taken as 1.1×10 3 kg / m 3 ).

[0097] In this embodiment, the empirical value of the sediment discharge ratio of the reservoir is calculated, and according to the definition formula of the sediment discharge ratio of the reservoir, the empirical value of the sediment discharge ratio of the reservoir can be converted into the empirical value of the annual inflow and outflow sediment content coefficient. In this embodiment, the empirical formula of the sediment discharge ratio of the high dam and large reservoir established based on the dynamic change of the reservoir capacity can ensure the accuracy of the formula calculation results under the conditions of long-term operation of the reservoir and continuous reduction of the effective storage capacity.

[0098] Embodiment 5

[0099] On the basis of the above embodiment, in this embodiment, the steps of using the correction parameter of the annual inflow and outflow sediment content coefficient to correct the theoretical value of the sediment discharge ratio of the flood season reservoir and the theoretical value of the sediment discharge ratio of the non-flood season reservoir to obtain the corrected value of the sediment discharge ratio of the flood season reservoir and the corrected value of the sediment discharge ratio of the non-flood season reservoir include:

[0100] Obtain correction parameters for the sediment content coefficients of the reservoir in and out during the flood season and the sediment content coefficients of the reservoir in and out during the non-flood season;

[0101] The theoretical value of the sediment discharge ratio of the reservoir during the flood season is corrected by using the correction parameter of the annual inflow and outflow sediment content coefficient and the correction parameter of the inflow and outflow sediment content coefficient during the flood season to obtain the correction value of the sediment discharge ratio of the reservoir during the flood season;

[0102] The theoretical value of the sediment discharge ratio of the reservoir in the non-flood season is corrected by using the correction parameters of the annual inflow and outflow sediment content coefficient and the correction parameters of the inflow and outflow sediment content coefficient in the non-flood season to obtain the correction value of the sediment discharge ratio of the reservoir in the non-flood season.

[0103] In this embodiment, the correction parameters of the sediment content coefficient of the inflow and outflow during the flood season and the correction parameters of the sediment content coefficient of the inflow and outflow during the non-flood season are used to correct the theoretical value of the sediment discharge ratio of the reservoir during the flood season and the theoretical value of the sediment discharge ratio of the reservoir during the non-flood season respectively:

[0104]

[0105] Among them, η1(t) and η2(t) are the theoretical values ​​of sediment discharge ratio in the flood season and the non-flood season of the reservoir in the tth year, respectively. are the water volume entering the reservoir during the flood season and the water volume entering the reservoir during the non-flood season in year t (billion m 3 ), are the water volume discharged from the reservoir in the flood season and the water volume discharged in the non-flood season in year t (billion m 3 ), a and 1-b are the correction parameters of the annual inflow and outflow sediment content coefficient, μ1 is the correction parameter of the inflow and outflow sediment content coefficient during the flood season, and μ2 is the correction parameter of the inflow and outflow sediment content coefficient during the non-flood season.

[0106] Embodiment 6

[0107] On the basis of the above embodiment, in this embodiment, the step of obtaining the weight coefficient of the sediment discharge ratio in the flood season and the weight coefficient of the sediment discharge ratio in the non-flood season includes:

[0108] Obtain the annual inflow of sediment, the inflow of sediment during the flood season, and the inflow of sediment during the non-flood season;

[0109] The proportion of the inflow of sand in the flood season is calculated based on the inflow of sand in the flood season and the annual inflow of sand, and the proportion of the inflow of sand in the non-flood season is calculated based on the inflow of sand in the non-flood season and the annual inflow of sand;

[0110] The weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the flood season and the sediment content coefficient entering and leaving the reservoir during the flood season, and the weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the non-flood season and the sediment content coefficient entering and leaving the reservoir during the non-flood season.

[0111] In this embodiment, according to the conservation of sufficient matter, the annual inflow and outflow of water and sediment in the reservoir is equal to the sum of the inflow and outflow of water and sediment in the flood season and the inflow and outflow of water and sediment in the non-flood season:

[0112]

[0113] Among them, Q out (t) is the water volume discharged from the reservoir in year t (billion m 3 ), Q in (t) is the amount of water entering the reservoir in year t (billion m 3 ), are the water volume entering the reservoir during the flood season and the water volume entering the reservoir during the non-flood season in year t (billion m 3 ), are the water volume discharged from the reservoir in the flood season and the water volume discharged in the non-flood season in year t (billion m 3 ), S out (t) is the sediment content discharged from the reservoir in year t (kg / m 3 ), S in (t) is the sediment content entering the reservoir in year t (kg / m 3 ), S 1 out (t), S 2 out (t) are the sediment content discharged from the reservoir in the flood season and the sediment content discharged from the reservoir in the non-flood season in the tth year, S 1 in (t), S 2 in (t) are the sediment content entering the reservoir during the flood season and the sediment content entering the reservoir during the non-flood season in year t respectively.

[0114] Substituting the above calculation formula into the definition of reservoir sediment discharge ratio, we can get:

[0115]

[0116] Substitute the theoretical expressions of reservoir sediment discharge ratio in flood season and non-flood season into the above formula for calculation:

[0117]

[0118] η(t)=c1×η1(t)+c2×η2(t)

[0119]

[0120] c1 and c2 are the proportion of sand entering the reservoir during the flood season and the proportion of sand entering the reservoir during the non-flood season, that is, the ratio of the sand entering the reservoir during the flood season and the non-flood season to the annual sand entering the reservoir.

[0121] According to the relationship between the annual reservoir sediment discharge ratio, the revised value of the reservoir sediment discharge ratio during the flood season, and the revised value of the reservoir sediment discharge ratio during the non-flood season, we can get:

[0122]

[0123] w1=c1×μ1

[0124] w2=c2×μ2

[0125] w1 and w2 are the weight coefficients of reservoir sediment discharge ratio in flood season and non-flood season respectively.

[0126] It can be obtained that the flood season sediment discharge weight coefficient w1 can be calculated using the proportion of sediment entering the reservoir during the flood season c1 and the correction parameter μ1 of the sediment content coefficient entering and leaving the reservoir during the flood season, and the flood season sediment discharge weight coefficient w2 can be calculated using the proportion of sediment entering the reservoir during the non-flood season c2 and the correction parameter μ2 of the sediment content coefficient entering and leaving the reservoir during the non-flood season.

[0127] It should be understood that although Figure 1A The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1A At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0128] Embodiment 7

[0129] Based on the above embodiments, this embodiment provides an application example.

[0130] In response to the above problems, this embodiment proposes a method for calculating the sediment discharge ratio of high dams and large reservoirs that takes into account the dynamic changes in reservoir capacity. The empirical formula for the reservoir sediment discharge ratio is improved based on the physical meaning of the reservoir sediment discharge ratio and the one-dimensional water-sediment model. The reservoir sediment discharge ratio of high dams and large reservoirs under different operating stages and operating conditions can be calculated, and the calculation accuracy of the empirical formula for the reservoir sediment discharge ratio can be effectively improved. Starting from the physical meaning of the reservoir sediment discharge ratio, the present invention clarifies the physical connection between the reservoir sediment discharge ratio and the retention time and the inlet and outlet flow coefficient. The one-dimensional water-sediment model is used to calculate the siltation process of the reservoir under long-term operating conditions, and the annual scale inlet and outlet sediment content coefficient is corrected by calculating the theoretical value of the reservoir sediment discharge ratio in the flood season and the non-flood season, and combining the water-sediment conservation relationship between the years, the flood season and the non-flood season, a weighted relationship between the annual sediment discharge ratio and the reservoir sediment discharge ratio in the flood season and the non-flood season is established. Figure 1B , the specific calculation steps are as follows:

[0131] (1) One-dimensional water-sediment model to calculate the annual sediment discharge ratio of the reservoir

[0132] Based on the non-equilibrium and unbalanced sediment transport theory, a one-dimensional water-sediment model equation group for reservoir sedimentation calculation is established, including the water flow continuity equation, water flow motion equation, water flow sediment entrainment equation, bed load sediment transport rate equation, and riverbed deformation equation. [21-23] .

[0133]

[0134] q is the flow rate (m 3 / s), x is the longitudinal migration distance of the river channel (m), h is the water level (m), J is the hydraulic gradient, n is the roughness of the river channel, B is the width of the river channel (m), U is the average flow velocity of the river (m / s), S * is the sand-carrying force of the water flow (kg / m 3 ), ω is the sediment settling velocity (m / s), k is the water flow sediment entrainment coefficient, m is the water flow sediment entrainment index, q b is the sediment transport rate of river load (kg / m 3 ), d is the particle size of bedload sediment (m), V b is the friction velocity of the river, K b and m b are the coefficient and exponent of the bed load transport rate formula, S is the suspended sediment content in the river channel (kg / m 3 ), α is the saturation coefficient of suspended sediment along the way.

[0135] The theoretical value of the annual sediment discharge ratio of the reservoir is calculated using a one-dimensional water-sediment model.

[0136]

[0137] S r is the sediment content in the reservoir area (kg / m 3 ), q outis the outbound flow (m 3 / s), S in is the sediment content of the river entering the reservoir (kg / m 3 ), q in is the inflow flow (m 3 / s).

[0138] (2) Definition of reservoir sediment discharge ratio to calculate annual sediment content coefficient in and out of the reservoir

[0139] Combined with the conservation relationship of water and sediment, the definition of reservoir sediment discharge ratio is converted into the product of inlet and outlet water volume coefficient and inlet and outlet sediment content coefficient.

[0140]

[0141] η(t) is the theoretical value of the reservoir sediment discharge ratio in the tth year, λ1(t) is the water volume coefficient of the reservoir in and out in the tth year, λ2(t) is the sediment content coefficient of the reservoir in and out in the tth year, S out (t) is the sediment content discharged from the reservoir in year t (kg / m 3 ), S in (t) is the sediment content entering the reservoir in year t (kg / m 3 ), Q out (t) is the water volume discharged from the reservoir in year t (billion m 3 ), Q in (t) is the amount of water entering the reservoir in year t (billion m 3 ). Since the outflow and inflow water volume are equal under annual scale conditions, the inflow and outflow water volume coefficient is 1, and the annual reservoir sediment discharge ratio is the inflow and outflow sediment content coefficient.

[0142] (3) Calculation of annual sediment content coefficient using Siyam's empirical formula

[0143] Combined with the amount of water entering the reservoir and the effective storage capacity of the reservoir, the Siyam empirical formula is used

[24] Calculate the annual inflow and outflow sediment content coefficient.

[0144]

[0145] V e (t) = V e (t-1)-S in (t-1)×Q in (t-1)×[1-η'(t-1)] / ρ' (12)

[0146] η'(t) is the empirical value of reservoir sediment discharge ratio in year t, η'(t-1) is the empirical value of reservoir sediment discharge ratio in year t-1, V e (t) is the effective storage capacity of the reservoir in year t (100 million m3), V e (t-1) is the effective storage capacity of the reservoir in year t-1 (100 million m3), S in(t-1) is the sediment content entering the reservoir in year t (kg / m 3 ), Q in (t-1) is the amount of water entering the reservoir in year t-1 (billion m 3 ), ρ' is the density of sediment deposited in the reservoir area (taken as 1.1×10 3 kg / m 3 ).

[0147] (4) Correction of sediment content coefficient in and out of the reservoir

[0148] Since the Siyam formula does not take into account the enhanced sediment discharge capacity of the reservoir when the effective storage capacity of the reservoir decreases, the calculation results of the Siyam formula in the later stage of reservoir operation are too small. Based on the calculation results of the inlet and outlet sediment content coefficient of the one-dimensional water-sediment model, the inlet and outlet sediment content coefficient of the Siyam empirical formula is corrected.

[0149] η(t)=k'×η'(t) (13)

[0150] k' is the correction term of the in-and-out sediment content coefficient in the Siyam formula. In order to characterize the influence of the change of the effective storage capacity of the reservoir on the in-and-out sediment content coefficient, an adaptive model of the correction term of the in-and-out sediment content coefficient and the theoretical value of the reservoir sediment discharge ratio is established. As the reservoir operation time continues to increase, the effective storage capacity continues to decrease, the closer the reservoir is to the erosion and siltation balance condition, the greater the reservoir sediment discharge ratio, and the greater the correction term of the in-and-out sediment content coefficient.

[0151] k'=a×[η(t)] b (14)

[0152] a and b are dimensionless parameters. Substituting equation (14) into equation (13), the modified form of the inlet and outlet sediment content coefficient is obtained after simplification.

[0153]

[0154] (5) Definition of reservoir sediment discharge ratio to calculate the theoretical value of reservoir sediment discharge ratio during flood season and non-flood season

[0155] Combined with the inlet and outlet water volume coefficient and the corrected inlet and outlet sediment content coefficient, the theoretical values ​​of the reservoir sediment discharge ratio during the flood season and the non-flood season are calculated respectively.

[0156]

[0157] η1(t) and η2(t) are the sediment discharge ratios of the reservoir in the flood season and the non-flood season in the tth year. is the amount of water entering the reservoir during the flood season and non-flood season in year t (billion m 3 ), is the water discharge from the reservoir during the flood season and non-flood season in year t (billion m 3), μ1 and μ2 are the correction items of the sediment content coefficients of inflow and outflow in the flood season and non-flood season and the annual sediment content coefficients of inflow and outflow.

[0158] (6) Weighted relationship between the annual sediment discharge ratio of a reservoir and the sediment discharge ratios during the flood season and the non-flood season

[0159] The annual amount of water and sediment flowing in and out of the reservoir and the amount of water and sediment flowing in and out during the flood season and non-flood season satisfy the law of conservation of matter.

[0160]

[0161] Substitute equations (20, 21) into the definition equation (8) of reservoir sediment discharge ratio to simplify it.

[0162]

[0163] Substitute the theoretical expressions (16, 17) of reservoir sediment discharge ratio in flood season and non-flood season into equation (22) for calculation.

[0164]

[0165] η(t)=c1×η1(t)+c2×η2(t)(24)

[0166]

[0167] c1 and c2 are the proportions of sediment entering the reservoir during the flood season and the non-flood season, that is, the ratio of the sediment entering the reservoir during the flood season and the non-flood season to the annual sediment entering the reservoir. Substituting equations (16 and 17) into equation (24) can be simplified as follows:

[0168]

[0169] w1=c1×μ1(28)

[0170] w2=c2×μ2 (29)

[0171] w1 and w2 are the weight coefficients of reservoir sediment discharge ratio in flood season and non-flood season respectively.

[0172] Embodiment 8

[0173] Based on the above embodiments, this embodiment provides an example.

[0174] In this embodiment, an empirical expression for the sediment discharge ratio of high dams and large reservoirs under the condition of dynamic changes in reservoir capacity is proposed to calculate the change process of the sediment discharge ratio of the cascade reservoirs in the lower reaches of the Jinsha River. The four cascade reservoirs in the lower reaches of the Jinsha River are Wudongde, Baihetan, Xiluodu, and Xiangjiaba Hydropower Stations, all of which are typical high dams and large reservoirs. In 2012 and 2013, the Xiangjiaba Reservoir and the Xiluodu Reservoir were successively put into operation, and relatively complete water and sediment data in and out of the reservoirs were available. Therefore, the operating data of the two reservoirs from 2013 to 2020 were used to verify the one-dimensional water and sediment model. The calculation results are shown as follows: Figure 2 The model calculation results of the average annual sedimentation of Xiluodu and Xiangjiaba reservoirs from 2013 to 2020 are 105 million tons and 2.5257 million tons, respectively. The measured values ​​of the average annual sedimentation are 108 million tons and 2.3057 million tons, respectively. The linear fit between the calculated sedimentation results and the observed values ​​of the two reservoirs is 0.97, indicating that the model has high calculation accuracy and can be used to calculate the future sedimentation of cascade reservoirs.

[0175] The calibrated one-dimensional water-sediment model was used to calculate the sedimentation process of the cascade reservoirs in the lower reaches of the Jinsha River in the next 100 years. The results are as follows: Figure 3 From 2021 to 2120, the cumulative sedimentation of the cascade reservoirs in the lower reaches of the Jinsha River is 13.014 billion tons, and the total reservoir capacity sedimentation rate is 25.79%. Among them, the average annual sedimentation of the Wudongde Reservoir is 37.123 million tons, and the reservoir capacity sedimentation rate is 45.29%; the average annual sedimentation of the Baihetan Reservoir is 54.3448 million tons, and the reservoir capacity sedimentation rate is 23.66%; the average annual sedimentation of the Xiluodu Reservoir is 36.3076 million tons, and the reservoir capacity sedimentation rate is 25.86%; the average annual sedimentation of the Xiangjiaba Reservoir is 3.5683 million tons, and the reservoir capacity sedimentation rate is 6.18%.

[0176] The Siyam formula is used to calculate the sediment discharge ratio of cascade reservoirs in the next 100 years and compared with the calculation results of the one-dimensional water-sediment model. The results are as follows: Figure 4 As shown in the figure. In the first 60 years of operation of the cascade reservoirs, the empirical formula of the reservoir sediment discharge ratio and the calculation results of the one-dimensional water-sediment model are generally consistent, indicating that the prediction results of siltation of the cascade reservoirs are relatively reliable; when the cascade reservoirs are in operation for 60 to 100 years, the one-dimensional water-sediment model calculation results of the sediment discharge ratio of the Wudongde and Xiluodu reservoirs are significantly greater than the Siyam formula calculation results. The main reason is that the retention time of the two reservoirs is long, the reservoir siltation process is fast, and the effective storage capacity is reduced, resulting in a significant increase in the sediment discharge capacity of the reservoir. When the operation is 0 to 60 years, the theoretical values ​​of the annual sediment discharge ratio of the cascade reservoirs (calculated by the one-dimensional water-sediment model) are 0.14, 0.04, 0.07, and 0.19, respectively; when the operation is 61 to 100 years, the theoretical values ​​of the annual sediment discharge ratio of the cascade reservoirs are 0.35, 0.04, 0.11, and 0.23, respectively, and the empirical formula calculation results are 0.18, 0.05, 0.10, and 0.19, respectively.

[0177] The correction coefficient of sediment content in and out of the cascade reservoirs on the lower reaches of the Jinsha River is calculated by formula (13), and the relationship between the correction coefficient of sediment content in and out of the reservoir and the theoretical value of the sediment discharge ratio of the reservoir is discussed in combination with formula (14). The results are as follows: Figure 5 shown.

[0178] Depend on Figure 5It can be seen that there is an obvious positive correlation between the correction coefficient of sediment content in and out of the reservoir and the theoretical value of the sediment discharge ratio of the reservoir. Formula (15) is used to fit the adaptive model parameters of the correction coefficient of sediment content in and out of the cascade reservoirs in the lower reaches of the Jinsha River. The results are shown in Table 1. The goodness of fit of the correction coefficient formula of sediment discharge ratio of the four cascade reservoirs is 0.95, 0.96, 0.87, and 0.86, respectively, indicating that the formula has high accuracy.

[0179] Table 1 Parameters of adaptive model for correction coefficients of sediment content in and out of cascade reservoirs on the lower reaches of Jinsha River

[0180]

[0181] Combined with the parameters in Table 1, the theoretical values ​​of sediment discharge ratios of the cascade reservoirs in the lower reaches of the Jinsha River in the flood season and non-flood season in the next 100 years are calculated. Figure 6 As shown in the data, the annual average sediment discharge ratios of the four cascade reservoirs (Wudongde-Baihetan-Xiluodu-Xiangjiaba) during the flood season were 0.102, 0.016, 0.022, and 0.045, respectively, and the annual average sediment discharge ratios during the non-flood season were 3.39×10-3, 2.47×10-3, 4.42×10-3, and 5.30×10-4, respectively. The sediment discharge ratios of the cascade reservoirs in the lower reaches of the Jinsha River change in the same pattern during the flood season and the non-flood season. The ratios of the sediment discharge ratios during the non-flood season to the sediment discharge ratios during the flood season of each cascade reservoir are 0.03, 0.13, 0.14, and 0.01, respectively.

[0182] The multivariate linear regression method was used to fit the weight coefficients w1 and w2 of the annual sediment discharge ratio and the sediment discharge ratio in the flood season and non-flood season of the cascade reservoirs in the lower reaches of the Jinsha River. The results are shown in Table 2. The fitting degree of the calculation result of formula (27) and the sediment discharge ratio calculated by the one-dimensional water-sediment model is above 0.85, indicating that the formula fitting accuracy is high.

[0183] Table 2 Weight coefficients of sediment discharge ratios of cascade reservoirs in the lower reaches of the Jinsha River during flood season and non-flood season

[0184]

[0185] This application calculates the sediment discharge ratio of high dams and large reservoirs, which has the following advantages:

[0186] (1) The empirical formula for sediment discharge ratio of high dams and large reservoirs, which is established based on the dynamic change of reservoir capacity, can ensure the accuracy of the calculation results under the conditions of long-term operation of the reservoir and continuous reduction of effective reservoir capacity;

[0187] (2) By analyzing the physical meaning of the reservoir sediment discharge ratio definition formula and correcting the reservoir inlet and outlet sediment content coefficient, the reliability of the reservoir sediment discharge ratio empirical expression can be ensured, and the calculation process of the reservoir sediment discharge ratio can be greatly simplified;

[0188] (3) Based on the conservation relationship between the annual inflow and outflow of water and sediment and the inflow and outflow of water and sediment during the flood and non-flood seasons, a weighted expression for the annual sediment discharge ratio is proposed, which reveals the impact of the reservoir operation mode during the flood and non-flood seasons on the interannual sediment discharge effect and can provide a theoretical basis for efficient sediment discharge from reservoirs.

[0189] Embodiment 9

[0190] In this embodiment, a device for calculating sediment discharge ratio of a high dam and a large reservoir is provided, comprising:

[0191] The flood season and non-flood season coefficient acquisition module is used to obtain the flood season in-and-out reservoir water volume coefficient, the non-flood season in-and-out reservoir water volume coefficient, the flood season in-and-out reservoir sediment content coefficient, and the non-flood season in-and-out reservoir sediment content coefficient;

[0192] The flood season and non-flood season sediment discharge ratio calculation module is used to calculate the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season according to the inlet and outlet water volume coefficient and the inlet and outlet sediment content coefficient;

[0193] A correction parameter acquisition module is used to obtain correction parameters of the annual inflow and outflow sediment content coefficient;

[0194] A correction module, used to correct the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season by using the correction parameter of the annual inflow and outflow sediment content coefficient, so as to obtain the corrected value of the sediment discharge ratio of the reservoir in the flood season and the corrected value of the sediment discharge ratio of the reservoir in the non-flood season;

[0195] A weight coefficient acquisition module is used to obtain a weight coefficient of sediment discharge ratio in flood season and a weight coefficient of sediment discharge ratio in non-flood season;

[0196] The annual reservoir sediment discharge ratio calculation module is used to weight the flood season reservoir sediment discharge ratio correction value using the flood season sediment discharge ratio weight coefficient, and to weight the non-flood season reservoir sediment discharge ratio correction value using the non-flood season sediment discharge ratio weight coefficient to obtain the reservoir's annual reservoir sediment discharge ratio.

[0197] In one embodiment, the correction parameter acquisition module includes:

[0198] The annual in-and-out sediment content coefficient acquisition unit is used to obtain the annual in-and-out sediment content coefficient;

[0199] An annual in-and-out sediment content coefficient empirical value acquisition unit is used to acquire the annual in-and-out sediment content coefficient empirical value;

[0200] The correction parameter calculation unit is used to calculate the correction parameter of the annual inlet and outlet sediment content coefficient according to the annual inlet and outlet sediment content coefficient empirical value and the annual inlet and outlet sediment content coefficient.

[0201] In one embodiment, the annual inflow and outflow sediment content coefficient acquisition unit is also used to calculate the annual sediment discharge ratio theoretical value of the reservoir using a one-dimensional water-sediment model; and convert the annual sediment discharge ratio theoretical value into the annual inflow and outflow sediment content coefficient using the reservoir sediment discharge ratio calculation formula.

[0202] In one embodiment, the annual inflow and outflow sediment content coefficient empirical value acquisition unit is further used to calculate the annual inflow and outflow sediment content coefficient empirical value using Siyam's empirical formula.

[0203] In one embodiment, the correction module includes:

[0204] A correction parameter acquisition unit, used to obtain correction parameters of the sediment content coefficient of the reservoir in and out during the flood season and correction parameters of the sediment content coefficient of the reservoir in and out during the non-flood season;

[0205] The first correction unit is used to correct the theoretical value of the sediment discharge ratio of the reservoir during the flood season by using the correction parameter of the annual inflow and outflow sediment content coefficient and the correction parameter of the inflow and outflow sediment content coefficient during the flood season to obtain the correction value of the sediment discharge ratio of the reservoir during the flood season;

[0206] The second correction unit is used to correct the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season by using the correction parameters of the annual inflow and outflow sediment content coefficient and the correction parameters of the inflow and outflow sediment content coefficient in the non-flood season to obtain the corrected value of the sediment discharge ratio of the reservoir in the non-flood season.

[0207] In one embodiment, the weight coefficient acquisition module includes:

[0208] The sediment volume acquisition unit is used to obtain the annual sediment volume, the sediment volume during the flood season, and the sediment volume during the non-flood season;

[0209] A sediment volume proportion calculation unit, used to calculate the proportion of sediment volume entering the reservoir during the flood season according to the sediment volume entering the reservoir during the flood season and the annual sediment volume entering the reservoir, and to calculate the proportion of sediment volume entering the reservoir during the non-flood season according to the sediment volume entering the reservoir during the non-flood season and the annual sediment volume entering the reservoir;

[0210] The weight calculation unit is used to calculate the weight coefficient of the flood season sediment discharge ratio by using the correction parameters of the proportion of the inflow sediment during the flood season and the sediment content coefficient of the inflow and outflow sediment during the flood season, and to calculate the weight coefficient of the flood season sediment discharge ratio by using the correction parameters of the proportion of the inflow sediment during the non-flood season and the sediment content coefficient of the inflow and outflow sediment during the non-flood season.

[0211] For the specific definition of the high dam and large reservoir sediment discharge ratio calculation device, please refer to the definition of the high dam and large reservoir sediment discharge ratio calculation method mentioned above, which will not be repeated here. Each unit in the above-mentioned high dam and large reservoir sediment discharge ratio calculation device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned units can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned units.

[0212] Embodiment 10

[0213] On the basis of the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0214] In some implementations of this embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the above embodiment are implemented.

[0215] In some implementations of this embodiment, a computer program product is provided, including a computer program, which implements the steps of the method described in the above embodiment when executed by a processor.

[0216] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components to execute the method in the above embodiments.

[0217] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media may include, but are not limited to, for example, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, computer storage media (such as hard disks, floppy disks, solid-state drives, removable disks, Blu-ray disks, etc.).

[0218] The computer-readable storage medium may also store at least one computer executable program, such as a computer-readable instruction. The computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The computer-readable storage medium may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device runs the computer-readable instructions stored on the computer-readable storage medium, the various methods described above may be performed.

[0219] In addition, the computer device may also include (but not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (eg, keyboard, mouse, speaker, etc.), etc.

[0220] The processor may communicate with external devices via an I / O bus via a wired or wireless network.

[0221] In one embodiment, the at least one computer executable instruction may also be compiled into or constitute a software product / computer program product, wherein one or more computer executable instructions are executed by a processor to perform the various functions and / or method steps in the embodiments described in the present technology.

[0222] In the embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0223] It should be noted that in the present disclosure, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0224] Although the embodiments disclosed in the present disclosure are as above, the above contents are only embodiments adopted for facilitating the understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.

Claims

1. A method for calculating the sediment discharge ratio of a high dam and a large reservoir, characterized in that: include: Obtain the water volume coefficients for inflow and outflow during the flood season, the water volume coefficients for inflow and outflow during the non-flood season, the sediment content coefficients for inflow and outflow during the flood season, and the sediment content coefficients for inflow and outflow during the non-flood season; According to the flood season inflow and outflow water coefficient, the non-flood season inflow and outflow water coefficient, the flood season inflow and outflow sediment content coefficient and the non-flood season inflow and outflow sediment content coefficient, respectively calculate the flood season reservoir sediment discharge ratio theoretical value and the non-flood season reservoir sediment discharge ratio theoretical value; Obtain the correction parameters of the annual inflow and outflow sediment content coefficient; The theoretical value of sediment discharge ratio of the reservoir in the flood season and the theoretical value of sediment discharge ratio of the reservoir in the non-flood season are corrected by using the correction parameter of the annual inflow and outflow sediment content coefficient to obtain the corrected value of sediment discharge ratio of the reservoir in the flood season and the corrected value of sediment discharge ratio of the reservoir in the non-flood season; Obtain the weight coefficient of sediment discharge ratio in flood season and the weight coefficient of sediment discharge ratio in non-flood season; The revised value of the reservoir sediment discharge ratio in the flood season is weighted by the flood season sediment discharge ratio weight coefficient, and the revised value of the reservoir sediment discharge ratio in the non-flood season is weighted by the non-flood season sediment discharge ratio weight coefficient. The annual reservoir sediment discharge ratio of the reservoir is calculated based on the weighted revised value of the reservoir sediment discharge ratio in the flood season and the weighted revised value of the reservoir sediment discharge ratio in the non-flood season.

2. The method according to claim 1, characterized in that The step of obtaining the correction parameter of the annual inflow and outflow sediment content coefficient comprises: Obtain the annual inflow and outflow sediment content coefficient; Obtain the empirical value of the annual inflow and outflow sediment content coefficient; According to the empirical value of the annual in-and-out sediment content coefficient and the annual in-and-out sediment content coefficient, the correction parameter of the annual in-and-out sediment content coefficient is calculated.

3. The method according to claim 2, characterized in that The steps of obtaining the annual inflow and outflow sediment content coefficient include: The theoretical value of the annual sediment discharge ratio of the reservoir is calculated using a one-dimensional water-sediment model; The annual sediment discharge ratio theoretical value is converted into the annual in-and-out sediment content coefficient by using the reservoir sediment discharge ratio calculation formula.

4. The method according to claim 2, characterized in that: The steps of obtaining the empirical value of the annual inflow and outflow sediment content coefficient include: The empirical value of the annual inflow and outflow sediment content coefficient is calculated using Siyam's empirical formula.

5. The method according to claim 1, characterized in that The step of using the correction parameter of the annual inflow and outflow sediment content coefficient to correct the theoretical value of the sediment discharge ratio of the flood season reservoir and the theoretical value of the sediment discharge ratio of the non-flood season reservoir to obtain the corrected value of the sediment discharge ratio of the flood season reservoir and the corrected value of the sediment discharge ratio of the non-flood season reservoir comprises: Obtain correction parameters for the sediment content coefficients of the reservoir in and out during the flood season and the sediment content coefficients of the reservoir in and out during the non-flood season; The theoretical value of the sediment discharge ratio of the reservoir during the flood season is corrected by using the correction parameter of the annual inflow and outflow sediment content coefficient and the correction parameter of the inflow and outflow sediment content coefficient during the flood season to obtain the correction value of the sediment discharge ratio of the reservoir during the flood season; The theoretical value of the sediment discharge ratio of the reservoir in the non-flood season is corrected by using the correction parameters of the annual inflow and outflow sediment content coefficient and the correction parameters of the inflow and outflow sediment content coefficient in the non-flood season to obtain the correction value of the sediment discharge ratio of the reservoir in the non-flood season.

6. The method according to claim 5, characterized in that The step of obtaining the weight coefficient of the sediment discharge ratio in the flood season and the weight coefficient of the sediment discharge ratio in the non-flood season comprises: Obtain the annual inflow of sediment, the inflow of sediment during the flood season, and the inflow of sediment during the non-flood season; The proportion of the inflow of sand in the flood season is calculated based on the inflow of sand in the flood season and the annual inflow of sand, and the proportion of the inflow of sand in the non-flood season is calculated based on the inflow of sand in the non-flood season and the annual inflow of sand; The weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the flood season and the sediment content coefficient entering and leaving the reservoir during the flood season, and the weight coefficient of the flood season sediment discharge ratio is calculated using the correction parameters of the proportion of sediment entering the reservoir during the non-flood season and the sediment content coefficient entering and leaving the reservoir during the non-flood season.

7. A device for calculating sediment discharge ratio of a high dam and a large reservoir, characterized in that: include: The flood season and non-flood season coefficient acquisition module is used to obtain the flood season in-and-out reservoir water volume coefficient, the non-flood season in-and-out reservoir water volume coefficient, the flood season in-and-out reservoir sediment content coefficient, and the non-flood season in-and-out reservoir sediment content coefficient; The flood season and non-flood season sediment discharge ratio calculation module is used to calculate the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season according to the inlet and outlet water volume coefficient and the inlet and outlet sediment content coefficient; A correction parameter acquisition module is used to obtain correction parameters of the annual inflow and outflow sediment content coefficient; A correction module, used to correct the theoretical value of the sediment discharge ratio of the reservoir in the flood season and the theoretical value of the sediment discharge ratio of the reservoir in the non-flood season by using the correction parameter of the annual inflow and outflow sediment content coefficient, so as to obtain the corrected value of the sediment discharge ratio of the reservoir in the flood season and the corrected value of the sediment discharge ratio of the reservoir in the non-flood season; The weighted coefficient acquisition module is used to obtain the weighted coefficient of the sediment discharge ratio in the flood season and the weighted coefficient of the sediment discharge ratio in the non-flood season; The annual reservoir sediment discharge ratio calculation module is used to weight the flood season reservoir sediment discharge ratio correction value using the flood season sediment discharge ratio weight coefficient, and to weight the non-flood season reservoir sediment discharge ratio correction value using the non-flood season sediment discharge ratio weight coefficient to obtain the reservoir's annual reservoir sediment discharge ratio.

8. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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