Flood scheduling method suitable for Fucheng river basin based on Xinanjiang river model

Abstract

The invention discloses a Xinanjiang river model-based flood scheduling method suitable for a Fucheng river basin. The scheduling method comprises the following steps of S01, parameter acquisition; s02, flood flow process calculation; s03, calculating the reservoir flow of the Fucheng River; s04, calculating the reservoir capacity of the Fucheng river reservoir at the end of the t period; s05, searching the water level height corresponding to the reservoir capacity of the Fucheng river reservoir in the t time period; s06, judging whether the water level height of the time period t exceeds a reservoir water level threshold value or not; s07, flood discharge treatment: calculating on the basis of the Xinanjiang hydrological model to obtain the flood volume forecast of the Xinanjiang and the Lanjiang, scheduling the reservoir flow of the Fucheng river hydropower station according to the flow relationship between the Fucheng river and the Xinanjiang and the Lanjiang, and controlling the power generation flow of the Xinanjiang river hydropower station. It is ensured that the reservoir inflow of the Fucheng river is within the threshold range, and flood control pressure caused by flood discharge to the downstream of the reservoir and reduction of economic benefits of the hydropower station due to flood discharge are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of flood control operation and water resource utilization, and particularly to a flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model. Background Art

[0002] The Fuchunjiang Hydropower Station is located at the outlet of the Qililong Gorge of the Fuchun River in the middle reaches of the Qiantang River in Zhejiang Province. The upper reaches of the main stream of the Fuchun River, the Qu River, originate from Lianhuajian at the junction of Zhejiang, Jiangxi, and Anhui provinces. Lianhuajian flows eastward to Lanxi and converges with the Jinhua River, which is usually called the Lan River. Then it flows northeastward to the vicinity of Meicheng Town, Jiande County and converges with the Xin'an River. The Lan River and the Xin'an River together flow into the Fuchun River.

[0003] With the development of technology, the energy structure is also developing towards diversity. Especially in the power field, in addition to traditional power generation methods, more and more power generation methods are being applied. Among them, hydropower is a clean energy source that does not produce greenhouse gas emissions, has less impact on the environment, helps to reduce air pollution and greenhouse gas emissions, and conforms to the environmental protection and sustainability of sustainable development. Hydropower does not require fuel, has relatively low operating costs, and hydropower stations can be combined with flood control, irrigation, water supply, shipping, aquaculture and other undertakings to realize the comprehensive utilization of water resources.

[0004] Therefore, hydropower stations have been built in both the Fuchun River Basin and the upper reaches of the Xin'an River. However, in the actual operation process of hydropower stations, in the flood season, considering the maximization of the economic benefits of hydropower stations, generally, it is hoped that the reservoir capacity is below the threshold range, and at the same time, the hydropower stations operate normally to ensure that the water flow in this basin can continuously generate economic benefits. However, in the flood season, when the inflow suddenly increases, the power generation flow of the hydropower station also remains at the maximum flow, and the reservoir capacity exceeds the threshold. At this time, flood discharge is required. The flood discharge process not only threatens the flood control safety downstream of the reservoir, but also the discharged water cannot be used by the hydropower station for power generation, affecting the economic benefits of the reservoir.

[0005] Since hydropower stations have been built in both the Fuchun River Basin and the Xin'an River Basin, a way is needed to establish a connection between the two hydropower stations, control these two hydropower stations to maximize the economic benefits of the power generation of the two hydropower stations, and avoid the economic losses caused by flood discharge. Summary of the Invention

[0006] To overcome the above problems, the object of the present invention is to provide a flood scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model. This flood scheduling method applicable to the Fuchunjiang River Basin calculates the flood volume forecasts of the Xin'anjiang River and the Lanjiang River based on the Xin'anjiang hydrological model. On this basis, according to the flow relationship between the Fuchunjiang River, the Xin'anjiang River, and the Lanjiang River, as well as the hydropower generation of the Fuchunjiang Hydropower Station and the Xin'anjiang Hydropower Station, the inflow of the Fuchunjiang Hydropower Station is scheduled to control the power generation flow of the above-mentioned Xin'anjiang Hydropower Station, ensuring that the inflow of the Fuchunjiang River is within the threshold range and avoiding the flood control pressure on the downstream of the reservoir caused by flood discharge and the reduction of the economic benefits of the hydropower station caused by flood discharge.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A flood scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model, comprising the following steps:

[0009] S01: Parameter acquisition, obtaining the water level storage curve of the Fuchunjiang Reservoir and the power generation flow process curve of the Xin'anjiang Hydropower Station;

[0010] S02: Calculation of the flood flow process, calculating the inflow of the Lanjiang River and the inflow of the Xin'anjiang River respectively based on the existing Xin'anjiang hydrological model to obtain the inflow process curve of the Lanjiang River and the inflow process curve of the Xin'anjiang River;

[0011] S03: Calculation of the inflow of the Fuchunjiang River , calculated according to the geographical location relationship by the following formula:

[0012] ,

[0013] wherein,

[0014] represents the inflow of the Fuchunjiang Reservoir at time t,

[0015] represents the inflow of the Lanjiang River at time t, obtained according to the inflow process curve of the Lanjiang River,

[0016] represents the power generation flow of the Xin'anjiang Power Plant at time t, obtained according to the power generation flow process curve of the Xin'anjiang Power Plant;

[0017] S04: Calculation of the reservoir capacity at the end of the t period of the Fuchunjiang Reservoir:

[0018] ,

[0019] wherein,

[0020] represents the reservoir capacity at the end of a certain period of the Fuchunjiang Reservoir,

[0021] represents the reservoir capacity at the beginning of a certain period of the Fuchunjiang Reservoir. The reservoir capacity at the beginning of a certain period is the same as the reservoir capacity at the end of the previous period of this period.

[0022] represents the power generation flow rate of the Fuchunjiang Power Plant in a certain period.

[0023] S05: Search for the water level height corresponding to the reservoir capacity of the Fuchunjiang Reservoir in period t ;

[0024] S06: Judge the water level height in period t whether it exceeds the reservoir water level threshold ;

[0025] S07: Flood discharge treatment,

[0026] If , then the Fuchunjiang Reservoir is in a state of about to flood, and it is necessary to control the power generation flow rate of the Xin'anjiang Hydropower Station.

[0027] If , then the Fuchunjiang Reservoir is in a safe state, and there is no need to control the power generation flow rate of the Xin'anjiang Hydropower Station.

[0028] As a further description of the present invention, the specific method for the control amount of the power generation flow rate of the Xin'anjiang Hydropower Station in S07 is:

[0029] S071: Calculate the exceeded height of the water level of the Fuchunjiang Reservoir in period t;

[0030] S072: Calculate the exceeded flow rate in period t according to the exceeded height;

[0031] S073: Obtain that the power generation flow rate of the Xin'anjiang Hydropower Station that needs to be controlled in period t is equal to the flow rate obtained in S072, that is:

[0032] ,

[0033] wherein,

[0034] represents the power generation flow rate that needs to be controlled by the Xin'anjiang Hydropower Station in period t,

[0035] represents the flow rate by which the Fuchunjiang Reservoir exceeds the threshold in period t.

[0036] As a further description of the present invention, the calculation formula for the exceeded height of the water level in S071 is:

[0037]

[0038] As a further description of the present invention, the calculation formula of S072 is:

[0039] ,

[0040] wherein,

[0041] represents the cross-sectional area of the Fuchunjiang Reservoir,

[0042] represents the excess height.

[0043] As a further description of the present invention, the water level threshold of the Fuchunjiang Reservoir is 23.5 meters.

[0044] As a further description of the present invention, in the power generation flow control of the Xin'anjiang Hydropower Station in S073, the reduction amount of the power generation flow in the t period needs to be greater than .

[0045] As a further description of the present invention, if the Xin'anjiang inflow in the t period calculated according to the Xin'anjiang model in S02 is greater than the power generation flow of the Xin'anjiang Hydropower Station in the t period that needs to be controlled , then the Fuchunjiang Reservoir needs to be flood-discharged.

[0046] As a further description of the present invention, the upper reaches of the Fuchunjiang River include the Xin'anjiang River and the Lanjiang River. The Xin'anjiang River and the Lanjiang River flow into the Fuchunjiang River together, and hydropower plants are built on both the Xin'anjiang River and the Fuchunjiang River.

[0047] As a further description of the present invention, when calculating the flood flow process in S02, rainfall data, evaporation data, upper and lower layer soil moisture content, initial basin state values, and runoff generation and concentration calculation parameters in the reservoir basin need to be input into the Xin'anjiang model.

[0048] Advantages of the present invention:

[0049] The flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model of the present invention includes the following steps: S01: Parameter acquisition; S02: Calculation of flood flow process; S03: Calculation of the inflow to the Fuchunjiang River; S04: Calculation of the reservoir capacity at the end of the t-th period of the Fuchunjiang Reservoir; S05: Finding the water level corresponding to the reservoir capacity of the Fuchunjiang Reservoir in the t-th period; S06: Judging whether the water level in the t-th period exceeds the reservoir water level threshold; S07: Flood discharge treatment. The flood control scheduling method applicable to the Fuchunjiang River Basin first calculates the flood volume forecasts of the Xin'anjiang River and the Lanjiang River on the basis of the Xin'anjiang hydrological model. On this basis, according to the flow relationship between the Fuchunjiang River, the Xin'anjiang River and the Lanjiang River, as well as the hydropower generation of the Fuchunjiang Hydropower Station and the hydropower generation of the Xin'anjiang River, the inflow to the Fuchunjiang Hydropower Station is scheduled, and the power generation flow of the Xin'anjiang Hydropower Station is controlled to ensure that the inflow to the Fuchunjiang River is within the threshold range, avoiding the flood control pressure on the downstream of the reservoir caused by flood discharge and the reduction of the economic benefits of the hydropower station caused by flood discharge.

[0050] The flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model of the present invention can timely detect flood phenomena and take technical measures of flood discharge or non-flood discharge at the Fuchunjiang Power Station, ensuring the maximization of the economic benefits of the Fuchunjiang Hydropower Station and reducing the harm caused by flood discharge at the same time. Description of the Drawings

[0051] Figure 1 It is a flow chart of the flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model proposed by the present invention;

[0052] Figure 2 It is a calculation flow chart of the Xin'anjiang model of the flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model proposed by the present invention;

[0053] Figure 3 It is a curve diagram of the basin water storage capacity area distribution and the mutual conversion relationship diagram of rainfall and runoff of the flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model proposed by the present invention;

[0054] Figure 4 It is a schematic diagram of the model confluence structure of the flood control scheduling method applicable to the Fuchunjiang River Basin based on the Xin'anjiang model proposed by the present invention. Detailed Embodiments

[0055] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed embodiments of the present invention in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0056] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0057] Secondly, as used herein, an "embodiment" or "embodiments" refer to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other.

[0058] The present invention will be described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of clarity, the cross-sectional views showing the device structure will be enlarged locally in a non-generalized scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0059] Meanwhile, in the description of the present invention, it should be noted that the orientation or positional relationships indicated by terms such as "upper, lower, inner, and outer" are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first, second, or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0060] Unless otherwise clearly defined and limited in the present invention, the terms "mounted, connected, and coupled" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can also be mechanically connected, electrically connected, or directly connected, or indirectly connected through an intermediate medium, or be in communication with each other inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] As Figures 1 to 4 shown, it shows the specific implementation manners of the present invention:

[0062] Embodiment 1

[0063] A flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model, comprising the following steps:

[0064] S01: Parameter acquisition, acquiring the water level - storage capacity curve of the Fuchunjiang Reservoir and the power generation flow process curve of the Xin'anjiang Hydropower Station;

[0065] S02: Calculation of flood flow process. Based on the existing Xin'anjiang hydrological model, calculate the inflow of the Lanjiang River into the reservoir and the inflow of the Xin'anjiang River into the reservoir to obtain the flood flow process curve of the Lanjiang River into the reservoir and the flood flow process curve of the Xin'anjiang River into the reservoir;

[0066] S03: Calculation of the inflow of the Fuchunjiang River into the reservoir is calculated according to the geographical location relationship by the following formula:

[0067] ,

[0068] where

[0069] represents the inflow of the Fuchunjiang River Reservoir at time t,

[0070] represents the inflow of the Lanjiang River at time t, obtained from the flood flow process curve of the Lanjiang River into the reservoir,

[0071] represents the power generation flow of the Xin'anjiang Power Plant at time t, obtained from the power generation flow process curve of the Xin'anjiang Power Plant;

[0072] S04: Calculation of the reservoir capacity at the end of time period t of the Fuchunjiang River Reservoir is calculated as follows:

[0073] ,

[0074] where

[0075] represents the reservoir capacity at the end of a certain time period of the Fuchunjiang River Reservoir,

[0076] represents the reservoir capacity at the beginning of a certain time period of the Fuchunjiang River Reservoir. The reservoir capacity at the beginning of a certain time period is the same as the reservoir capacity at the end of the previous time period of this time period,

[0077] represents the power generation flow of the Fuchunjiang Power Plant in a certain time period,

[0078] S05: Search for the water level corresponding to the reservoir capacity at time t of the Fuchunjiang River Reservoir ;

[0079] S06: Judge whether the water level at time t exceeds the reservoir water level threshold ;

[0080] S07: Flood discharge treatment,

[0081] If , the Fuchunjiang Reservoir is in a state of about to flood, and it is necessary to control the power generation flow of the Xin'anjiang Hydropower Station.

[0082] If , the Fuchunjiang Reservoir is in a safe state, and there is no need to control the power generation flow of the Xin'anjiang Hydropower Station.

[0083] In this embodiment, as Figure 1 shown, the scheduling method includes the following steps: S01: Parameter acquisition; S02: Flood flow process calculation; S03: Calculation of the inflow of the Fuchunjiang River; S04: Calculation of the reservoir capacity at the end of the t-th period of the Fuchunjiang Reservoir; S05: Finding the water level height corresponding to the reservoir capacity of the Fuchunjiang Reservoir in the t-th period; S06: Judging whether the water level height in the t-th period exceeds the reservoir water level threshold; S07: Flood discharge treatment. The flood scheduling method applicable to the Fuchunjiang River Basin first calculates the flood volume forecasts of the Xin'anjiang River and the Lanjiang River on the basis of the Xin'anjiang Hydrological Model. On this basis, according to the flow relationship between the Fuchunjiang River and the Xin'anjiang River and the Lanjiang River, as well as the hydraulic power generation of the Fuchunjiang Hydropower Station and the hydraulic power generation of the Xin'anjiang River, the inflow of the Fuchunjiang Hydropower Station is scheduled to control the power generation flow of the above-mentioned Xin'anjiang Hydropower Station, ensuring that the inflow of the Fuchunjiang River is within the threshold range and avoiding the flood control pressure caused by flood discharge to the downstream of the reservoir and the reduction of the economic benefits of the hydropower station caused by flood discharge.

[0084] Embodiment Two

[0085] On the basis of the above embodiment, this Embodiment Two proposes the specific value of the power generation flow of the Xin'anjiang Hydropower Station that needs to be controlled after the Fuchunjiang Reservoir exceeds the water level threshold.

[0086] As a further description of the present invention, the specific method for controlling the power generation flow of the Xin'anjiang Hydropower Station in S07 is:

[0087] S071: Calculate the exceeded height of the water level of the Fuchunjiang Reservoir in the t-th period;

[0088] S072: Calculate the exceeded flow in the t-th period according to the exceeded height;

[0089] S073: Obtain that the power generation flow that needs to be controlled by the Xin'anjiang Hydropower Station in the t-th period is equal to the flow obtained in S072, that is:

[0090] ,

[0091] where

[0092] represents the power generation flow that needs to be controlled by the Xin'anjiang Hydropower Station in the t-th period,

[0093] represents the flow exceeded the threshold of the Fuchunjiang Reservoir in the t-th period.

[0094] As a further description of the present invention, the calculation formula for the water level exceeding height of S071 is:

[0095]

[0096] As a further description of the present invention, the calculation formula for S072 is:

[0097] ,

[0098] Wherein,

[0099] represents the cross-sectional area of the Fuchunjiang Reservoir,

[0100] represents the exceeding height.

[0101] As a further description of the present invention, the upper reaches of the Fuchunjiang River include the Xin'an River and the Lanjiang River. The Xin'an River and the Lanjiang River converge into the Fuchunjiang River together, and hydropower plants are built on both the Xin'an River and the Fuchunjiang River.

[0102] In this embodiment, since the Xin'anjiang Hydropower Station is located upstream of the Fuchunjiang Hydropower Station, the power generation flow of the Xin'anjiang Hydropower Station becomes a component of the inflow of the Fuchunjiang Reservoir. The Fuchunjiang Reservoir serves as the power source of the Fuchunjiang Hydropower Station. When the water level of the Fuchunjiang Reservoir exceeds the threshold, the power generation flow of the Xin'anjiang Hydropower Station upstream of the Fuchunjiang River Basin can be controlled at this time to control the inflow of the Fuchunjiang Reservoir, so as to maximize the economic benefits of the Fuchunjiang Hydropower Station.

[0103] In this embodiment, the power generation flow of the Xin'anjiang Hydropower Station that needs to be controlled is the flow of the part of the Fuchunjiang Reservoir exceeding the threshold height of the area. By calculating in advance the power generation flow that needs to be controlled, the Xin'anjiang Hydropower Station can be accurately controlled.

[0104] Embodiment Three

[0105] As a further description of the present invention, the water level threshold of the Fuchunjiang Reservoir is 23.5 meters.

[0106] In this embodiment, in combination with the actual threshold situation of the Fuchunjiang Reservoir, its water level threshold is 23.5 meters, which is directly used in the calculation.

[0107] As a further description of the present invention, in the control of the power generation flow of the Xin'anjiang Hydropower Station in S073, the reduction amount of the power generation flow in the t period needs to be greater than .

[0108] In this embodiment, in the control of the power generation flow of the Xin'anjiang Hydropower Station, the reduction amount of the power generation flow in the t period needs to be greater than , which can ensure that the inflow of the Fuchun River is below the threshold range, enabling the rational utilization of water resources and optimizing economic benefits.

[0109] As a further description of the present invention, if the Xin'anjiang inflow at time t calculated according to the Xin'anjiang model in S02 is greater than the power generation flow of the Xin'anjiang Hydropower Station at time t that needs to be controlled , then the Fuchunjiang Reservoir needs to be flood-discharged.

[0110] In this embodiment, the inflow of the Xin'anjiang Hydropower Station also affects its power generation flow, which needs to be considered simultaneously to avoid the flood disasters caused by the too rapid rise of the water level in the Xin'anjiang Reservoir. Therefore, if the Xin'anjiang inflow at time t is greater than the power generation flow of the Xin'anjiang Hydropower Station at time t that needs to be controlled , then the Fuchunjiang Reservoir needs to be flood-discharged, and the flood-discharge can be carried out in stages to avoid the losses of downstream production and life caused by large floods.

[0111] Embodiment Four

[0112] As a further description of the present invention, when calculating the flood flow process in S02, the rainfall data, evaporation data, upper and lower layer soil moisture contents, initial state values of the basin, and runoff generation and concentration calculation parameters in the reservoir basin need to be input into the Xin'anjiang model.

[0113] In this embodiment, when using the Xin'anjiang model to calculate the flood flow process in S02, the hourly data of 48 consecutive hours of the remote rainfall gauges in the basin need to be input into the model, specifically including the rainfall data, evaporation data, upper and lower layer soil moisture contents, initial state values of the basin, and runoff generation and concentration calculation parameters in the reservoir basin.

[0114] In the use of the Xin'anjiang model, its model structure is decentralized, mainly divided into four levels: evapotranspiration calculation, runoff generation calculation, sub-source calculation, and concentration calculation. The evapotranspiration calculation adopts a three-layer evapotranspiration model; the runoff generation calculation adopts the full storage runoff generation; the water source division adopts a free reservoir structure to divide the total runoff into surface runoff, subsurface runoff, and groundwater runoff; the basin concentration adopts the unit hydrograph or linear reservoir method; the channel concentration adopts the Muskingum method and the lag algorithm. The functions of the model's various hierarchical structures, the calculation methods and parameters used are shown in Table 1, and the calculation process of each unit basin is as Figure 2 shown.

[0115] Table 1 Functions, Calculation Methods, and Corresponding Parameters of Each Hierarchical Structure of the Xin'anjiang Model

[0116]

[0117] The first level, the evapotranspiration calculation process is as follows:

[0118] In the Xin'anjiang model, although the basin evapotranspiration method does not consider the uneven distribution of soil moisture content on the surface, it takes into account the uneven vertical distribution of soil moisture content. The three-layer evapotranspiration model considers the soil evaporation amounts in the upper layer, lower layer, and deep layer.

[0119] ,

[0120] ,

[0121] ,

[0122] ,

[0123] In the above formula, is the evaporation amount in the upper layer, in mm; the evaporation amount in the lower layer, in mm; is the evaporation amount in the deep layer, in mm; is the total evaporation amount, is the basin evapotranspiration capacity, in mm; is the soil moisture content in the lower layer, in mm; is the evapotranspiration diffusion coefficient; is the soil water holding capacity in the lower layer, in mm.

[0124] The specific calculation steps are as follows:

[0125] When ,

[0126] Then: ,

[0127] When , if ,

[0128] Then: ,

[0129] If ,

[0130] Then: ,

[0131] If ,

[0132] Then: ,

[0133] In the formula, is the rainfall amount, in mm; is the soil moisture content in the upper layer, in mm.

[0134] At the second level, the runoff generation calculation process is as follows:

[0135] For runoff calculation in the Xin'anjiang model, the full storage runoff model is adopted. No runoff occurs before precipitation satisfies the field capacity, and all precipitation replenishes the soil moisture content. After precipitation satisfies the field capacity, all precipitation generates runoff after deducting the simultaneous evapotranspiration. The full storage runoff calculates the runoff volume using the storage capacity - area distribution curve, considering the uniform spatial distribution of soil moisture content. The basin storage capacity curve is a curve showing the relationship between storage capacity and corresponding area obtained by arranging the storage capacities at various locations in the basin from large to small.

[0136]

[0137] In the above formula, is the runoff area, with the unit of ; is the total basin area, with the unit of ; is the single - point storage capacity of the basin, with the unit of mm; is the maximum single - point storage capacity of the basin, with the unit of mm; is the storage capacity - area distribution curve index.

[0138] The basin storage capacity area distribution curve and its conversion relationship between rainfall and runoff are as Figure 3 shown.

[0139] Figure 3 In it, the two left - hand figures are the basin storage capacity area - distribution curves, and the right - hand side is the relationship between the storage capacity - area distribution curve and rainfall runoff. In the figure, is the average storage capacity of the basin, with the unit of mm; is the runoff volume, with the unit of mm; is the initial soil moisture content; is the rainfall minus evaporation, i.e., the net rainfall, with the unit of mm.

[0140] When , local runoff occurs:

[0141] ,

[0142] When , full - basin runoff occurs:

[0143] .

[0144] At the third level, the calculation process of the water source division is as follows:

[0145] The water source division adopts the free storage reservoir model, considering the vertical storage and regulation function of the vadose zone. The runoff R calculated according to the full storage runoff model is partly formed into surface runoff RS, and the other part enters the free storage reservoir for regulation. The subsurface flow RI is formed from the side outlet of the free reservoir, and the base flow RG is formed from the bottom outlet of the free reservoir. According to the concept of full storage runoff, runoff can only be generated on the runoff area FR, and the runoff area is variable, so FR should be variable.

[0146] The three-water-source division structure uses the free water storage capacity curve to consider the non-uniformity of the free water storage capacity distribution in the basin. The type of the free water storage capacity curve in the basin is:

[0147] ,

[0148] In the above formula, is the free water storage capacity of a single point in the basin, with the unit of mm; is the maximum free water storage capacity of a single point in the basin, with the unit of mm; is the exponent of the free water storage capacity - area distribution curve in the basin.

[0149] ,

[0150] In the above formula, is the initial free water storage in the basin, with the unit of mm; is the initial free water storage of a single point in the basin, with the unit of mm.

[0151] When , , substituting it into the above formula, we can obtain:

[0152] ,

[0153] ,

[0154] In the above formula, is the free water storage capacity in the basin, with the unit of mm.

[0155] The runoff area FR is:

[0156] ,

[0157] When , the surface runoff is:

[0158] ,

[0159] When , the surface runoff is:

[0160] ,

[0161] Subsurface flow and baseflow are as follows:

[0162] ,

[0163] ,

[0164] In the above formula, is the subsurface flow coefficient; the baseflow coefficient.

[0165] The fourth level, the process of flow concentration calculation is as follows:

[0166] Flow concentration is divided into overland flow concentration, mountain river flow concentration and plain river network flow concentration. For areas with relatively complete flood data, the linear reservoir flow concentration model method is used for overland flow concentration calculation; if there are reservoirs in the sub-region, the flow process obtained from overland flow concentration needs to go through the flood routing calculation of the reservoir to calculate the outflow process of the reservoir, and then the Muskingum method is used for river flow concentration calculation to obtain the flood flow process entering the downstream river.

[0167] Nash envisioned that the flow concentration effect of the basin can be replaced by the storage effect of n identical linear reservoirs connected in series, as Figure 4 shown. The flow process at the basin outlet section is the outflow after the basin net rainfall is regulated by these reservoirs. Based on this envision, the mathematical equation of the instantaneous unit hydrograph can be derived:

[0168] ,

[0169] In the above formula, is the number of linear reservoirs; is the gamma function of n; K is the storage coefficient of the linear reservoir, with the unit of time.

[0170] The surface runoff concentration is:

[0171] ,

[0172] In the above formula, QS is the surface runoff, with the unit of ; CS is the surface runoff recession coefficient; RS is the surface runoff, with the unit of mm; U is the unit conversion coefficient.

[0173] The subsurface flow concentration is:

[0174] ,

[0175] In the above formula, QI is the subsurface flow, with the unit of ; CI is the recession coefficient of subsurface flow; RI is the subsurface flow, with the unit of mm; U is the unit conversion coefficient.

[0176] The subsurface runoff concentration is:

[0177] ,

[0178] In the above formula, QG is the subsurface runoff, with the unit of ; CG is the recession coefficient of subsurface runoff; RG is the subsurface runoff, with the unit of mm; U is the unit conversion coefficient.

[0179] The total inflow of the unit area is:

[0180] ,

[0181] For the river network concentration of the unit area, the lag algorithm is adopted.

[0182] ,

[0183] In the above formula, Q is the outlet flow of the unit area, with the unit of ; CR is the recession coefficient of river network storage; L is the lag time. However, for a smaller unit area and a shorter river course, the river network regulation effect is small, and its regulation effect can be considered in the linear reservoir regulation effect of the hillslope runoff concentration. The error caused by doing so is very small and can be ignored.

[0184] For the river channel runoff concentration of the unit area, the Muskingum segment continuous algorithm is adopted.

[0185] The parameters are the storage coefficient KE and the discharge ratio coefficient XE, and these two parameters are the same for each unit river reach.

[0186] ,

[0187] Wherein:

[0188] ,

[0189] ,

[0190] ,

[0191] In the formula, Q and I are the outflow and inflow respectively, with the unit of .

[0192] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

[0193] Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model, characterized in that It includes the following steps: S01: Parameter acquisition, acquiring the water level - storage capacity curve of the Fuchunjiang Reservoir and the power generation discharge process curve of the Xin'anjiang Hydropower Station; S02: Flood discharge process calculation. Based on the existing Xin'anjiang hydrological model, calculate the inflow to the Lanjiang River and the inflow to the Xin'anjiang River respectively. and the inflow to the Xin'anjiang River to obtain the flood discharge process curve of the Lanjiang River and the flood discharge process curve of the Xin'anjiang River. S03: Inflow to the Fuchun River Reservoir is calculated according to the geographical location relationship using the following formula: ， 。 2. Among them, Denote the inflow at time t of the Fuchunjiang Reservoir, represents the inflow at time t of the Lanjiang River, obtained from the inflow process curve of the Lanjiang River It represents the power generation flow rate at time t of Xin'anjiang Power Plant and is obtained based on the power generation flow rate process curve of Xin'anjiang Power Plant; S04: Storage capacity of the Fuchunjiang Reservoir at the end of period t Calculation: ， Among them, represents the reservoir capacity at the end of a certain period of the Fuchunjiang Reservoir, It represents the reservoir capacity at the beginning of a certain period of the Fuchunjiang Reservoir. The reservoir capacity at the beginning of a certain period is the same as the reservoir capacity at the end of the previous period of that period. Indicates the power generation flow of Fuchunjiang Power Plant at a certain period of time, S05: Find the water level corresponding to the reservoir capacity of the Fuchunjiang Reservoir at time t ; S06: Determine the water level height during period t whether it exceeds the reservoir water level threshold ; S07: Flood discharge treatment, If , the Fuchunjiang Reservoir is about to release flood, and it is necessary to control the power generation flow of the Xin'anjiang Hydropower Station. If , the Fuchunjiang Reservoir is in a safe state and there is no need to control the power generation flow of the Xin'anjiang Hydropower Station.

3. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 1, characterized in that The specific method for the control quantity of the power generation discharge of the Xin'anjiang Hydropower Station in S07 is as follows: S071: Calculate the water level exceeding height of the Fuchunjiang Reservoir at time t; S072: Calculate the exceeding discharge at time t according to the exceeding height; S073: Obtain that the power generation discharge of the Xin'anjiang Hydropower Station to be controlled at time t is equal to the discharge obtained in S072, that is: ， Among them, represents the generating discharge that needs to be controlled at time t of Xin'anjiang Hydropower Station, Indicates the flow rate of the Fuchunjiang Reservoir exceeding the threshold during period t.

4. The flood control scheduling method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 2, characterized in that The calculation formula for the water level exceeding height in S071 is: 。 5. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 2, characterized in that, The calculation formula for S072 is: , Among them, represents the cross-sectional area of the Fuchunjiang Reservoir, Indicates exceeding the height.

6. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 1, characterized in that, The water level threshold of the Fuchunjiang Reservoir is 23.5 meters.

7. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 2, characterized in that In the power generation flow control of Xin'anjiang Hydropower Station in S073, the reduction in the power generation flow during the t period needs to be greater than .

8. The flood control scheduling method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 6, characterized in that, If the Xin'anjiang reservoir inflow at time t calculated according to the Xin'anjiang model in the said SO2 is greater than the power generation flow of the Xin'anjiang Hydropower Station at time t that needs to be controlled , then flood discharge needs to be carried out for the Fuchunjiang Reservoir.

9. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 1, characterized in that The upper - reaches river of the Fuchunjiang includes the Xin'anjiang and the Lanjiang. The Xin'anjiang and the Lanjiang flow into the Fuchunjiang together, and hydropower plants are built on both the Xin'anjiang and the Fuchunjiang.

10. The flood control operation method applicable to the Fuchun River Basin based on the Xin'anjiang model according to claim 1, characterized in that, When calculating the flood discharge process in S02, rainfall data, evaporation data, soil moisture content of upper and lower layers, initial state values of the basin, and runoff - generating and confluence calculation parameters in the reservoir basin input in the Xin'anjiang model are required.

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