A method, device, medium, and product for determining flood diversion strategies in flood storage and detention areas based on a balance perspective.

Abstract

This invention discloses a method, device, medium, and product for determining flood diversion strategies for flood storage and detention areas based on a balance perspective, relating to the field of flood diversion management technology. The method includes: determining the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in each river section after the operation of the reservoir group scheduling in a preset period; constructing a correlation graph between the flood diversion volume and the reduction value of the flood diversion flood level under each set combination of flood diversion parameters; determining the utilization priority and flood diversion volume of all flood storage and detention areas in all river sections; determining the cumulative flood diversion volume of each flood storage and detention area according to the order of utilization priority; constructing a knowledge graph of flood storage and detention area utilization based on the correlation graph and each cumulative flood diversion volume, and determining multiple flood diversion schemes; and selecting one flood diversion scheme as the target scheme from among the flood diversion schemes based on the objective function and constraints to achieve flood diversion. This method can support the timely and appropriate scheduling and utilization of flood storage and detention areas, meet the rapid decision-making needs of key indicators for the utilization of flood storage and detention areas, and reduce flood disaster losses.

Description

Technical Field

[0001] This invention relates to the field of flood diversion management technology, and in particular to a method, device, medium and product for determining flood diversion strategies for flood storage and detention areas based on a balance perspective. Background Technology

[0002] Under the dual impacts of global climate change and human activities, the frequency, intensity, duration, and scope of extreme rainfall events have increased significantly, further raising the probability of catastrophic floods. To defend against major floods, after more than 70 years of construction, China has established a basin-wide flood control engineering system that combines dikes as the foundation, reservoirs as the backbone, flood storage and detention areas with river regulation, and flood diversion through embankments with soil and water conservation. Reservoirs, dikes, and flood storage and detention areas respectively undertake the tasks of flood interception, flood diversion, and flood distribution, and their spatial relationships are as follows: Figure 2 As shown, floodwaters are first impounded by upstream reservoirs, and excess floodwaters are then safely discharged into the sea through dikes. If the flood volume is too large, exceeding the safe discharge capacity of the dikes, the remaining excess floodwaters are stored in flood storage and detention areas. Therefore, flood storage and detention areas are an important component of the basin's flood control engineering system and serve as the last resort—the "trump card"—to ensure the basin's flood control safety. With rapid socio-economic development, the inundation losses caused by the activation of flood storage and detention areas are increasing, making their use increasingly difficult. The decision-making process is primarily based on prioritizing the overall situation and weighing the lesser of two evils; essentially, it is a measure to alleviate flood control pressure along the entire river channel while sacrificing local resources for key areas. Currently, there is no advanced and applicable method for quickly determining the timing of flood storage and detention area deployment, deciding on the order of deployment, determining the number of days of use, and calculating the scheduling effect during major floods. Commonly used hydrodynamic model methods suffer from low computational efficiency, numerous input parameters, and high requirements for terrain accuracy, impacting valuable flood control assessment time.

[0003] The development of all things, large and small, in nature and society is a process of balance-conflict-the formation of a new balance. In the operation of flood storage and detention areas, the issue of how to allocate excess floodwater across different river sections often arises. This involves balancing the responsibility and loss sharing among the excess floodwater, operating water level, and the timing, quantity, order, and duration of the activation of flood storage and detention areas in the river section where the flood protection zone is located. To achieve this balance, the medium is the decision-making method; through scheme comparison, a balance of gains and losses for all parties is reached. Whether the flood storage and detention area operation scheme is reasonable is crucial to the balance of gains and losses among all parties. An unreasonable scheme not only fails to balance the gains and losses of all parties but may even exacerbate the existing imbalance, intensifying the conflict. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, medium, and product for determining flood diversion strategies in flood storage and detention areas based on a balance perspective, supporting the timely and appropriate scheduling and use of flood storage and detention areas, meeting the rapid decision-making needs for key indicators of flood storage and detention area use, and reducing flood disaster losses.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for determining flood diversion strategies in flood storage and detention areas based on a balance perspective includes:

[0007] Determine the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in the preset time period after the reservoir group scheduling and operation of each river section;

[0008] Construct a correlation graph between flood diversion volume and flood level reduction under various combinations of flood diversion parameters;

[0009] Determine the utilization priority and flood diversion volume of all flood storage and detention areas in all river sections;

[0010] The cumulative flood diversion volume of each flood storage and detention area is determined according to the order of application priority; the cumulative flood diversion volume of any current flood storage and detention area is the sum of the flood diversion volumes of all flood storage and detention areas with higher application priority than the current flood storage and detention area and the current flood storage and detention area.

[0011] Based on the aforementioned relationship graph and the cumulative flood diversion volume of each flood storage and detention area, a knowledge graph of the use of flood storage and detention areas is constructed.

[0012] Based on the knowledge graph of the flood storage and detention area, multiple flood diversion schemes are determined; the flood diversion schemes include the number of flood storage and detention areas used and the number of days each flood storage and detention area is used.

[0013] Based on the objective function and constraints, one flood diversion scheme is selected from the various flood diversion schemes as the objective scheme to achieve flood diversion; the objective function is to minimize the comprehensive disaster loss of the flood storage and detention area; the constraints are determined based on the excess flood volume, the excess flood peak, and the water level after flood diversion.

[0014] Optionally, the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in each river section after the reservoir group operation is scheduled for a preset period are determined, including:

[0015] Select any reservoir in any group of reservoirs in any current river segment as the current reservoir; determine any moment in the preset time period as the current moment;

[0016] Determine the inflow rate of the uncontrolled section of the reservoir and the measured flow rate at the reservoir control station at the current moment;

[0017] Based on the inflow rate of the uncontrolled section and the measured flow rate at the inflow control station at the current moment, determine the inflow flood volume of the reservoir at the current moment;

[0018] Based on the inflow flood volume of the reservoir at the current moment, the outflow flood volume of the reservoir at the current moment is determined using the reservoir group flood regulation model;

[0019] Based on the outflow of floodwater from all reservoirs in the current river section at the current moment, determine the inflow boundary at the current moment;

[0020] Based on the current inflow boundary, determine the pre-flood diversion water level and pre-flood diversion flow of the main control station in the current river section at the current moment;

[0021] Obtain the safe discharge capacity for the current river section;

[0022] Based on the safe discharge and the pre-diversion flow at each moment in the preset time period of the main control station of the current river section, calculate the excess flood peak and excess flood volume of the current river section in the preset time period.

[0023] Optionally, a correlation graph is constructed between the flood diversion volume and the decrease in flood level under various combinations of set flood diversion parameters, including:

[0024] Multiple combinations of flood diversion parameters are determined; the combinations of flood diversion parameters include: a set flood diversion flow rate, a set number of flood diversion dates, and a set flood diversion duration for each flood diversion date;

[0025] Determine the flood diversion volume and the flood level reduction value under each set flood diversion parameter combination; the flood level reduction value is the water level reduction value before and after flood diversion using the flood diversion volume under each set flood diversion parameter combination.

[0026] Based on all the set flood diversion parameter combinations and the corresponding flood diversion volume and flood level reduction values, a correlation map between the flood diversion volume and flood level reduction values ​​under each set flood diversion parameter combination is constructed.

[0027] Optionally, the flood diversion volume and the reduction in flood level under each set combination of flood diversion parameters are determined, including:

[0028] Based on the set flood diversion flow, the number of set flood diversion dates, and the set flood diversion duration for each set flood diversion parameter combination, calculate the flood diversion volume under the corresponding set flood diversion parameter combination;

[0029] The flood diversion volume under each set flood diversion parameter combination is used to determine the corresponding flood level reduction value under that set flood diversion parameter combination.

[0030] Optionally, the constraints include:

[0031] In the flood diversion plan, the cumulative flood diversion volume of the flood storage and detention areas used is greater than or equal to the excess flood volume in the preset period.

[0032] In the flood diversion scheme, the flood diversion capacity of the gates in the flood storage and detention areas used is greater than or equal to the excess flood peak during the preset period;

[0033] And the water level after flood diversion using the flood diversion scheme is lower than the guaranteed water level.

[0034] Optionally, after selecting a flood diversion scheme as the target scheme from among the various flood diversion schemes based on the objective function and constraints, and implementing the flood diversion, the process includes:

[0035] The reduction in flood level under the target flood diversion scheme is calculated based on the water level after the flood diversion using the target scheme and the water level before the flood diversion using the target scheme.

[0036] A computer device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the method for determining flood diversion strategies based on a balance perspective as described in any of the preceding claims.

[0037] A computer-readable storage medium having a computer program stored thereon, characterized in that, when executed by a processor, the computer program implements the steps of the method for determining flood diversion strategies for flood storage and detention areas based on a balance perspective as described above.

[0038] A computer program product includes a computer program, characterized in that, when executed by a processor, the computer program implements the steps of the method for determining flood diversion strategies based on a balance perspective for flood storage and detention areas as described in any of the preceding claims.

[0039] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0040] This invention discloses a method, device, medium, and product for determining flood diversion strategies for flood storage and detention areas based on a balanced perspective. By using a knowledge graph of flood storage and detention area utilization, it integrates different flood diversion timings, utilization priorities, utilization days, and scheduling effects onto a single graph. This visually demonstrates the flood diversion effects of different flood storage and detention area utilization schemes, balancing the relationship between flood diversion demand and the flood diversion capacity of flood storage and detention areas. It supports timely and appropriate scheduling and utilization of flood storage and detention areas, facilitates rapid scheme evaluation, adapts to complex flood scenarios, improves computational efficiency for different flood diversion needs, shortens decision-making time during disasters, fully reflects the advanced nature of flood storage and detention area utilization schemes under different flood disasters, maximizes the utilization of flood diversion effects of flood storage and detention areas, and reduces losses caused by inappropriate selection of flood storage and detention areas. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1This is a schematic diagram of the method for determining flood diversion strategies in flood storage and detention areas based on a balance perspective, provided in Embodiment 1 of the present invention.

[0043] Figure 2 A schematic diagram showing the distribution of the flood control engineering system in the basin;

[0044] Figure 3 A schematic diagram of a coupled calculation method for flood diversion timing, deployment order, number of days of use, and scheduling effect based on a balance perspective in flood storage and detention areas;

[0045] Figure 4 A schematic diagram showing the correlation between flood diversion volume and flood level reduction under various combinations of flood diversion parameters in the Chenglingji section of the river.

[0046] Figure 5 A schematic diagram of the correlation curves between the threshold range of flood diversion effect and the feasible region of flood storage capacity in flood storage and detention areas;

[0047] Figure 6 This is a diagram of the internal structure of a computer device. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The purpose of this invention is to provide a method, device, medium, and product for determining flood diversion strategies in flood storage and detention areas based on a balance perspective. This aims to support the timely and appropriate scheduling and utilization of flood storage and detention areas, meet the rapid decision-making needs for key indicators of flood storage and detention area utilization, and reduce flood disaster losses.

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Example 1

[0052] like Figure 1 As shown, the flood diversion strategy determination method based on the balance perspective in this embodiment includes:

[0053] Step 101: Determine the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in the preset time period after the reservoir group is scheduled and operated in each river section.

[0054] As an optional implementation, step 101 includes:

[0055] Step 1011: Select any reservoir in any group of reservoirs in any current river segment as the current reservoir; determine any moment in the preset time period as the current moment.

[0056] Step 1012: Determine the inflow rate of the uncontrolled section of the reservoir and the measured flow rate at the reservoir control station at the current moment.

[0057] Step 1013: Based on the inflow rate of the uncontrolled section and the measured flow rate at the inflow control station at the current moment, determine the inflow flood volume of the reservoir at the current moment.

[0058] Step 1014: Based on the inflow flood volume of the reservoir at the current moment, use the reservoir group flood control model to determine the outflow flood volume of the reservoir at the current moment.

[0059] Step 1015: Determine the inflow boundary at the current moment based on the outflow flood volume of all reservoirs in the current river section at the current moment.

[0060] Step 1016: Determine the pre-flood diversion water level and pre-flood diversion flow of the main control station of the current river section based on the inflow boundary at the current moment.

[0061] Step 1017: Obtain the safe discharge capacity for the current river section.

[0062] Step 1018: Based on the safe discharge and the pre-diversion flow at each moment in the preset time period of the main control station of the current river section, calculate the excess flood peak and excess flood volume of the current river section in the preset time period.

[0063] Step 102: Construct a correlation graph between flood diversion volume and flood level reduction under each set combination of flood diversion parameters.

[0064] As an optional implementation, step 102 includes:

[0065] Step 1021: Determine multiple combinations of flood diversion parameters; the combinations of flood diversion parameters include: setting the flood diversion flow rate, setting the number of flood diversion dates, and setting the flood diversion duration for each flood diversion date.

[0066] Step 1022: Determine the flood diversion volume and the flood level reduction value under each set flood diversion parameter combination; the flood level reduction value is the water level reduction value before and after flood diversion using the flood diversion volume under each set flood diversion parameter combination.

[0067] As an optional implementation, step 1022 includes:

[0068] Step 10221: Based on the set flood diversion flow, the set number of flood diversion dates, and the set flood diversion duration for each flood diversion date in each set flood diversion parameter combination, calculate the flood diversion volume under the corresponding set flood diversion parameter combination.

[0069] Step 10222: Determine the flood level reduction value under each set flood diversion parameter combination based on the flood diversion volume under each set flood diversion parameter combination.

[0070] Step 1023: Based on all the set flood diversion parameter combinations and the corresponding flood diversion volume and flood level reduction values, construct a correlation map between the flood diversion volume and flood level reduction values ​​under each set flood diversion parameter combination.

[0071] Step 103: Determine the utilization priority and flood diversion volume of all flood storage and detention areas in all river sections.

[0072] Step 104: Determine the cumulative flood diversion volume of each flood storage and detention area according to the order of application priority.

[0073] The cumulative flood diversion volume of any current flood storage and detention area is the sum of the flood diversion volumes of all flood storage and detention areas with higher utilization priority than the current flood storage and detention area and the current flood storage and detention area.

[0074] Step 105: Based on the correlation graph and the cumulative flood diversion volume of each flood storage and detention area, construct a knowledge graph of the use of flood storage and detention areas.

[0075] Step 106: Based on the knowledge graph of the flood storage and detention area, determine multiple flood diversion schemes.

[0076] The flood diversion plan includes the number of flood storage and detention areas to be used and the number of days each flood storage and detention area is in operation.

[0077] Step 107: Based on the objective function and constraints, select one flood diversion scheme from among the various flood diversion schemes as the objective scheme to achieve flood diversion.

[0078] The objective function is to minimize the overall disaster loss of the utilized flood storage and detention area. The constraints are determined based on excess flood volume, excess flood peak, and the water level after flood diversion.

[0079] As an optional implementation, the constraints include:

[0080] In the flood diversion plan, the cumulative flood diversion volume of the flood storage and detention areas used is greater than or equal to the excess flood volume for the preset period.

[0081] In the flood diversion plan, the flood diversion capacity of the gates in the flood storage and detention areas used is greater than or equal to the excess flood peak during the preset period.

[0082] And the water level after flood diversion using the flood diversion scheme is lower than the guaranteed water level.

[0083] As an optional implementation, after step 107, the following steps are included:

[0084] The reduction in flood level under the target flood diversion scheme is calculated based on the water level after the flood diversion using the target scheme and the water level before the flood diversion using the target scheme.

[0085] To implement the method in Example 1, such as Figure 3 As shown, a coupled calculation method for flood diversion timing, deployment order, number of days of use, and scheduling effect in flood storage and detention areas based on a balance perspective is also provided, including:

[0086] S1: Calculate the excess flood peak and excess flood volume of the middle and lower reaches of the main stream after the reservoir group is operated and scheduled for each river section, so as to determine the flood diversion demand.

[0087] (1) Calculation of reservoir flood control and river flood.

[0088] ① Calculate the uncontrolled inflow Q of the i-th reservoir at time t (t∈[T1,T2]) using lumped hydrological models such as Xin'anjiang, water tank, NAM, API, unit hydrograph, or improved distributed hydrological models. in2i (t). Among them, the uncontrolled section of the reservoir is the part where there is no hydrological station for flow monitoring, T1 is the initial time of the preset time period [T1, T2], and T2 is the end time of the preset time period [T1, T2].

[0089] ②The measured flow rate Q at the inflow control station of the i-th reservoir at time t. in1i (t) and the inflow rate Q in the uncontrolled area in2i Given (t), the inflow flood volume Q of the i-th reservoir at time t is obtained using the Muskingen piecewise algorithm. ini (t).

[0090] ③ Using Q ini (t) is the input, and the outflow flood Q of the i-th reservoir at time t is calculated based on the reservoir group flood regulation model after flood interception, peak reduction, and peak staggering. outi (t).

[0091] ④ Using Q outi (t) is the input, and the Muskingen piecewise algorithm is used to calculate the flow process from the i-th reservoir to the control section of the main stream and tributary at time t. This serves as the inflow boundary Q at time t for the calculation of the main stream of the middle and lower reaches of the plain. o (t).

[0092] ⑤ Based on Q o (t), the inflow of the middle and lower reaches of the main stream is calculated by using a hydrodynamic model, and the pre-flood level Z(t) and pre-flood flow Q(t) of the main control station at time t are obtained.

[0093] (2) Calculation of excess flood peak and excess flood volume.

[0094] ① Check the guaranteed water level Z of the main stream control stationg and safe discharge Q s If there is no safe leakage Q s Based on the water level-discharge relationship curve or hydrodynamic model, according to Z... g Calculated.

[0095] ②Based on Q(t) and the safe discharge Q s The excess flood peak Q was calculated. c (t1) and excess flood volume Wc are calculated using the following formula:

[0096] Q c (t1)=MAX(Q(t))-Q s , t∈[T1,T2] (1).

[0097] Wc = SUM(Q) j (t2)-Q s (2).

[0098] Among them, Q j (t2) represents the pre-diversion flow rate at each moment in the preset time period [T1, T2] where the pre-diversion flow rate exceeds the safe discharge rate; MAX() is the maximum function; SUM() is the summation function; SUM(Q j (t2)-Q s ) refers to the total water volume exceeding the safe discharge capacity before flood diversion; MAX(Q(t)) is the maximum flow rate in the preset time period [T1, T2], i.e., the peak flow rate; Q c (t1) represents the excess flood peak corresponding to the maximum flow rate at time t1 in the preset time period [T1, T2].

[0099] S2: Analyze the flood diversion volume and flood diversion effect (i.e., the reduction value of flood diversion water level) under different assumed flood diversion flow and flood diversion duration (i.e., set flood diversion parameter combinations), construct the relationship map between flood diversion state elements and flood discharge state elements (i.e., the correlation map between flood diversion volume and flood diversion water level reduction value), and determine the threshold range of flood diversion effect.

[0100] (1) Calculation of flood diversion volume under different assumed flood diversion flow and flood diversion duration.

[0101] Flood diversion volume W under different assumed flood diversion flow rates and durations n The calculation formula is as follows:

[0102]

[0103] Where Q1 is the assumed flood diversion flow; n is the assumed number of flood diversion days (i.e., the set number of flood diversion dates), and t n Let W be the assumed flood diversion duration on day n. It can be seen that the larger the flood diversion flow, the larger the flood diversion volume W. nThe more floodwaters diverted, the longer the flood diversion period; the greater the amount of floodwater diverted.

[0104] (2) Calculation of flood diversion effect under different assumed flood diversion flow and flood diversion duration.

[0105] Based on the flood diversion volume under different assumed flood diversion flows and durations, and combined with hydrodynamic models or water level-discharge relationship curves, the water level reduction value of each river section's flood control station (i.e., the flood level reduction value under the corresponding set flood diversion parameter combination) is obtained. The calculation formula for the flood level reduction value under any assumed flood diversion flow and duration is as follows:

[0106] ΔZ y =Z by -Z ay (4).

[0107] Among them, Z by Z represents the water level at the y-th flood control station before flood diversion, determined based on the excess flood volume before diversion; ay Let ΔZ be the water level after flood diversion at the y-th flood control station, determined based on the excess flood volume after diversion; y Let y be the water level drop value of the y-th flood control station.

[0108] (3) Construction of the relationship map between flood diversion state elements and flood discharge state elements.

[0109] An Excel spreadsheet was used to construct a correlation graph between flood diversion status elements (represented by flood diversion flow, flood diversion duration (including assumed number of diversion days and assumed diversion duration for each diversion date), and flood diversion volume) and flood discharge status elements (represented by water level drop). This graph yielded the corresponding flood diversion volume and water level changes under different flood diversion flows and durations. The results showed that, for the same flood diversion duration or number of days of flood storage and detention area operation, a larger flood diversion flow resulted in a faster diversion speed, a greater cumulative flood diversion volume, and a larger drop in water level at the flood control station in the affected river section. Conversely, for the same flood diversion flow, a longer diversion duration resulted in a greater cumulative flood diversion volume and a larger drop in water level at the flood control station.

[0110] S3: Based on the flood storage and detention area operation regulations, formulate the order of use of flood storage and detention areas in different river sections, calculate the cumulative flood diversion volume of flood storage and detention areas in sequence, and determine the feasible area of ​​flood storage capacity of flood storage and detention areas (i.e., cumulative flood diversion volume).

[0111] (1) Determining the order of use of flood storage and detention areas in different river sections.

[0112] ① The flood storage and detention areas are classified according to the river section they are located in, and are divided into flood storage and detention area groups such as river section A, river section B, and river section C. The flood storage and detention area groups are activated in sequence from upstream to downstream of the river section.

[0113] ② Based on the probability of activation and the importance of the protected objects, flood storage and detention areas are divided into three categories: important flood storage and detention areas, general flood storage and detention areas, and flood storage and detention reserve areas. Important flood storage and detention areas have a higher probability of use, generally for floods with a return period of less than once in 20 years; general flood storage and detention areas are used to defend against floods within the standard range; and flood storage and detention reserve areas are used to defend against floods exceeding the standard range or catastrophic floods. The classification of flood storage and detention areas as "important," "general," and "reserved" is determined according to the flood storage and detention area dispatching regulations and the national flood storage and detention area construction plan.

[0114] ③ Prioritize the use of important flood storage and detention areas, then use general flood storage and detention areas. If the excess water level still cannot be reduced to below the guaranteed water level, then finally use flood storage and detention reserve areas.

[0115] ④ The final order of use of flood storage and detention areas is as follows: first, important flood storage and detention areas in the upstream flood storage and detention area group; then, general flood storage and detention areas in the upstream flood storage and detention area group; and finally, flood storage and detention reserve areas in the upstream flood storage and detention area group. Then, the downstream flood storage and detention area group is activated in sequence according to the location of the river section. The order of use of each flood storage and detention area, k, starts from the number 1 and is numbered by natural numbers from small to large, with the largest number being q.

[0116] (2) Calculation of the cumulative flood diversion volume of the flood storage and detention area.

[0117] ① First, based on topographic data, calculate the water level-area-volume relationship of each flood storage and detention area, and determine the flood diversion volume V of the kth flood storage and detention area. a (k) size, and arrange them according to the order of use of each flood storage and detention area.

[0118] ②According to the order of use of the flood storage and detention areas, starting from serial number 1 to serial number q, the cumulative flood diversion volume V corresponding to the use of the kth flood storage and detention area is obtained. A (k), the recursive formula is as follows:

[0119] V A (k)=V A (k-1)+V a (k), k>1 (5).

[0120] V A (1) = V a (1), k = 1 (6).

[0121] Among them, V A (k) represents the cumulative flood diversion volume from the 1st to the kth flood storage and detention area, i.e., the cumulative flood diversion volume corresponding to the operation of the kth flood storage and detention area; V A (1) is the cumulative flood diversion volume corresponding to the first flood storage and detention area in operation; V a (1) The flood diversion volume of the first flood storage and detention area.

[0122] ③ Finally, the maximum cumulative flood diversion volume V is obtained. A (q) represents the maximum volume of flood diversion that can be achieved when all flood storage and detention areas are in use, thus determining the maximum limit and feasible range of flood storage capacity of the flood storage and detention areas.

[0123] S4: Construct a knowledge graph of the flood diversion effect threshold range (i.e., the water level reduction value before and after flood diversion under various set flood diversion parameter combinations) and the feasible domain of flood storage capacity (i.e., the knowledge graph of flood storage and detention area application), formulate flood storage and detention area application schemes based on the balance perspective, and evaluate the flood diversion effect under different schemes.

[0124] (1) Construction of the knowledge graph of the threshold range of flood storage and detention area and the feasible domain of flood storage capacity.

[0125] A cluster of correlation curves between the flood control effect threshold range and the feasible region of flood storage capacity in flood storage and detention areas was constructed using an Excel spreadsheet, serving as a knowledge graph for the application of flood storage and detention areas.

[0126] (2) Formulating a flood storage and detention area operation plan based on the balance perspective.

[0127] ① Determine the number of flood storage and detention areas to be activated based on the relative size of the excess flood volume in the river section and the flood storage capacity of the flood storage and detention area.

[0128] When the excess flood volume Wc in a river section reaches a certain value, this method can provide various application schemes for flood storage and detention areas, and can allocate different flood storage volumes V of different flood storage and detention areas. am By combining these parameters, we obtain the cumulative flood diversion capacity V. A The number of flood storage and detention areas to be activated is determined based on the relationship between the excess flood volume Wc and its magnitude, using the following formula:

[0129]

[0130] The following constraints must be met:

[0131] V A (m)≥Wc (8).

[0132] Where m represents the number of flood storage and detention areas in use.

[0133] When the excess flood volume in a river section exceeds the original flood storage capacity of the flood detention area, the number of flood detention areas should be increased so that the flood storage capacity of the flood detention area is greater than the excess flood volume in the river section. However, the principle of using as few flood detention areas as possible should be followed.

[0134] ② Determine the number of flood storage and detention areas to be activated based on the relative size of the excess flood peak and the flood diversion capacity of the flood storage and detention areas.

[0135] When the excess flood peak Q c The flood diversion capacity Q of the gates in the flood storage and detention areas is greater than that of the flood detention gates. capIn such cases, measures typically include increasing the number of flood storage and detention areas in operation or increasing the flood diversion flow by blasting the flood diversion gates of the flood storage and detention areas' dikes, so that excess flood peaks can be discharged into the flood storage and detention areas as quickly as possible. Therefore, when selecting flood storage and detention areas, the design flow capacity Q of the flood diversion gates and flood diversion gates of each flood storage and detention area should be consulted. cap To incorporate this factor, the following constraints must be met:

[0136] Q cap ≥Q c (t1) (9).

[0137] Without damaging water conservancy structures, eliminate from existing plans schemes those where the excess flood peak exceeds the design flow capacity of the flood storage and detention area.

[0138] ③Based on a balanced perspective, comprehensively assess the number of flood storage and detention areas to be activated.

[0139] When using the flood storage and detention areas according to the operational sequence k, the increase in the number of flood storage and detention areas leads to an increase in the assumed flood diversion flow Q1 for each scheme, ΔZ. y Increase, Z ay Lowering the water level below the guaranteed level allows for a locally optimal flood diversion effect, from which the disaster loss f at this point can be calculated. b As the number of flood storage and detention areas activated increases, the flood diversion losses increase, and the additional disaster losses f at this time can be calculated accordingly. ar (n).

[0140] With the constraints of the excess flood volume in the river section being less than the flood storage capacity of the flood detention area and the excess flood peak being less than the design flow capacity, and with the objective function of minimizing the comprehensive disaster loss F(r) of the activated flood detention areas, an optimization algorithm is used to balance the gains and losses of all parties to determine the final number of flood detention areas that need to be activated. The calculation formula is as follows:

[0141] F(r) = MIN(f) ar (n)+f b (10).

[0142] Where r is the r-th scheme to be implemented; MIN() is the minimum value function; MIN(f ar (n)+f b (n) represents the minimum disaster loss during the implementation of scheme r; n represents the number of flood storage and detention areas used in the r-th scheme; f ar (n) represents the additional disaster losses after implementing the r-th plan; f b The existing disaster losses before the implementation of the r-th plan.

[0143] (3) Evaluation of the flood diversion effect under different schemes.

[0144] ① Based on the above steps, the water level reduction value ΔZ at the flood control station of each river section can be calculated.i The ultimate goal of flood diversion is to achieve the following water level Z at each flood control station after implementing the r-th plan: ay (r) is below the guaranteed water level Z g As shown in the following formula:

[0145] Z ay (r)≥Z g (11).

[0146] Among them, Z ay (r) represents the water level at the y-th flood control station after the implementation of the r-th scheme.

[0147] ②This invention evaluates the scheduling effect of different schemes based on the water level difference of the main river section before and after flood diversion in flood storage and detention areas. The greater the water level reduction, the better the flood diversion effect.

[0148] ③Evaluate the scheduling effect of flood storage and detention areas after their use, based on different combinations of flood diversion timing, deployment order, and number of days of operation, i.e., under the premise of achieving the flood diversion target, the water level difference ΔZ at the main stream control station. y The larger the diameter, the better the flood diversion effect.

[0149] In summary, the final constraints include formulas (8), (9), and (11).

[0150] The present invention will now be described in detail using the example of a flood diversion scheme for flood storage and detention areas in the middle and lower reaches of the Yangtze River. This invention also has guiding significance for the formulation of application schemes for other flood storage and detention areas.

[0151] (1) Calculate the excess flood peak and excess flood volume of the middle and lower reaches of the river after the reservoir group is scheduled and operated, and determine the flood diversion demand.

[0152] In the event of a once-in-300-year flood in 1935, the storage capacity of the Three Gorges Dam and its upstream reservoirs is shown in Table 1 below, according to the current dispatching regulations.

[0153] Table 1. Current Operating Conditions and Storage Capacity of Upstream Reservoirs

[0154]

[0155] To analyze the excess flood volume in the middle and lower reaches, the flood diversion control water level scheme of Shashi Station 45.0m, Chenglingji Station 34.4m, Hankou Station 29.5m, and Hukou Station 22.5m was used for calculation. The calculation results of the excess flood volume of the 300-year flood in 1935 are shown in Table 2.

[0156] Table 2. Excess Flood Volume in the Middle and Lower Reaches of the Yangtze River under Current Operating Conditions

[0157]

[0158] As can be seen from Table 2, the excess flood volume was mainly concentrated in the river section near Chenglingji.

[0159] (2) Analyze the flood diversion volume and flood diversion effect under different assumed flood diversion flow and flood diversion duration, construct the relationship map between flood diversion state elements and flood discharge state elements, and determine the threshold range of flood diversion effect.

[0160] Taking Lianhuatang, the flood control station in the Chenglingji section of the Yangtze River, as a representative station, the flood diversion volume and effect under each scheme were calculated based on different assumed flood diversion flows and durations (using the water level reduction at Lianhuatang station on the main stream of the Yangtze River as a representation), as shown in Tables 3 and 4. The unit of flood diversion volume is 100 million cubic meters. 3 The unit for flood diversion effect is m.

[0161] Table 3. Flood diversion volume and diversion effect under the first group of assumed flood diversion flow and flood diversion duration.

[0162]

[0163] Table 4. Flood diversion volume and diversion effect under the assumed flood diversion flow and flood diversion duration in Group 2.

[0164]

[0165]

[0166] A correlation map was constructed between flood diversion state elements and flood discharge state elements (represented by the water level drop at Lianhuatang Station) in the Chenglingji section of the river. Figure 4 As shown.

[0167] (3) Based on the flood storage and detention area dispatching regulations, formulate the order of use of flood storage and detention areas in different river sections, calculate the cumulative flood diversion volume of flood storage and detention areas in sequence, and determine the feasible area of ​​flood storage capacity of flood storage and detention areas.

[0168] Based on the probability of activation of flood storage and detention areas and the importance of the protected objects, the order of use of flood storage and detention areas in the Chenglingji River section and the cumulative flood diversion volume are determined, as shown in Table 5.

[0169] Table 5. Feasible Regions for Flood Storage Capacity of Flood Detention Areas

[0170]

[0171]

[0172] (4) Construct a knowledge graph of the threshold range of flood diversion effect and the feasible domain of flood storage capacity in flood storage and detention areas, formulate flood diversion schemes based on the balance perspective, and evaluate the flood diversion effect under different schemes.

[0173] Construct a cluster of correlation curves between the flood diversion effect threshold range of flood storage and detention areas and the feasible region of flood storage capacity, as a basis for... Figure 5The flood storage and detention area shown utilizes a knowledge graph. From... Figure 5 It can be seen that as the excess flood volume increases, the number of flood storage and detention areas that need to be put into operation also increases. When the excess flood volume is 2 billion cubic meters... 3 At that time, only the Qianlianghu dike needs to be activated; when the excess flood volume increases to 20 billion cubic meters... 3 At that time, the flood storage and detention areas that needed to be put into operation successively included Qianlianghu embankment (important flood storage and detention area), Gongshuangcha embankment (important flood storage and detention area), Datonghu East embankment (important flood storage and detention area), Chengxi embankment (important flood storage and detention area), Minzhu embankment (important flood storage and detention area), Weidihu embankment (important flood storage and detention area), Xiguan embankment (important flood storage and detention area), Linan embankment (important flood storage and detention area), Honghu East sub-block (important flood storage and detention area), and Honghu Central sub-block (general flood storage and detention area). Simultaneously, with the increase of flood diversion flow (i.e., the flow capacity of the flood diversion gates), the flood storage and detention areas could be quickly filled, even with an excess flood volume of 4 billion cubic meters. 3 If the Qianlianghu and Gongshuangcha dikes are used for flood diversion, but the flood diversion flow is 4000 m³ / h... 3 If the flood diversion rate is / s, then the number of days for flood diversion operation needs to reach 11 days. If the flood diversion flow rate increases sequentially to 6000 m³ / s, then the number of days for flood diversion operation needs to reach 11 days. 3 / s, 8000m 3 / s, 10000m 3 / s, 12000m 3 / s, 16000m 3 / s、20000m 3 / s, then the number of days for flood diversion is reduced to 8 days, 6 days, 5 days, 4 days, 3 days, and 2 days respectively. Therefore, this map can be used to determine the timing, order of deployment, and number of days for flood diversion in flood storage and detention areas, in conjunction with the flood forecast period, the length of time for flood control decision-making, the volume of flood storage and detention areas, and the size of the outlets. The scheduling effect after the use of flood storage and detention areas can also be evaluated, that is, the reduction in water level at the main stream control station under the premise of achieving the flood diversion target, such as when the excess flood volume is less than 2 billion m³. 3 At that time, only Qianlianghu embankment needs to be activated, based on 1000m 3 During flood diversion at a scale of / s, the water level of Lianhua Pond decreased by 0.02m and 0.1m respectively after 1 day and 12 days of diversion. (Based on a 10000m...) 3 During flood diversion at a scale of / s, the water level of Lianhua Pond decreased by 0.24m and 1m after 1 day and 12 days, respectively. Decision-makers can use this information to determine the gate opening and closing method. If the gate's flow capacity is insufficient, they can choose whether to use blasting flood diversion to increase the flood diversion flow.

[0174] Example 2

[0175] A computer device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for determining flood diversion strategies based on a balance perspective in Embodiment 1.

[0176] Example 3

[0177] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for determining flood diversion strategies based on a balance perspective in Example 1.

[0178] Example 4

[0179] A computer program product includes a computer program that, when executed by a processor, implements the steps of the method for determining flood diversion strategies for flood storage and detention areas based on a balance perspective in Embodiment 1.

[0180] Example 5

[0181] A computer device, which may be a database, may have an internal structure diagram as shown below. Figure 6 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores pending transactions. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements the flood diversion strategy determination method based on a balance perspective in Embodiment 1.

[0182] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this invention are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0183] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided by this invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided by this invention may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided by this invention may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0184] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0185] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for determining flood diversion strategies in flood storage and detention areas based on a balance perspective, characterized in that, The method includes: Determine the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in the preset time period after the reservoir group scheduling and operation of each river section; Constructing a correlation graph between flood diversion volume and flood level reduction under various set flood diversion parameter combinations includes: determining multiple set flood diversion parameter combinations; the set flood diversion parameter combinations include: set flood diversion flow rate, set number of flood diversion dates, and set flood diversion duration for each flood diversion date; determining the flood diversion volume and flood level reduction under each set flood diversion parameter combination; the flood level reduction is the water level reduction before and after flood diversion using the flood diversion volume under each set flood diversion parameter combination; and constructing a correlation graph between the flood diversion volume and flood level reduction under each set flood diversion parameter combination based on all set flood diversion parameter combinations and their corresponding flood diversion volumes and flood level reductions. Determine the utilization priority and flood diversion volume of all flood storage and detention areas in all river sections; The cumulative flood diversion volume of each flood storage and detention area is determined according to the order of application priority; the cumulative flood diversion volume of any current flood storage and detention area is the sum of the flood diversion volumes of all flood storage and detention areas with higher application priority than the current flood storage and detention area and the current flood storage and detention area. Based on the aforementioned relationship graph and the cumulative flood diversion volume of each flood storage and detention area, a knowledge graph of the use of flood storage and detention areas is constructed. Based on the knowledge graph of the flood storage and detention area, multiple flood diversion schemes are determined; the flood diversion schemes include the number of flood storage and detention areas used and the number of days each flood storage and detention area is used. Based on the objective function and constraints, one flood diversion scheme is selected from the various flood diversion schemes as the objective scheme to achieve flood diversion; the objective function is to minimize the comprehensive disaster loss of the flood storage and detention area being used; the constraints are determined based on the excess flood volume, the excess flood peak, and the water level after flood diversion. F(r)=MIN(f ar (n)+f b ); Where F(r) represents the comprehensive disaster loss of the activated flood storage and detention area; r is the r-th scheme implemented; MIN() is the minimum value function; n is the number of flood storage and detention areas used in the r-th scheme; f ar (n) represents the additional disaster losses after implementing the r-th plan; f b The existing disaster losses before the implementation of the r-th plan; The constraints include: In the flood diversion plan, the cumulative flood diversion volume of the flood storage and detention areas used is greater than or equal to the excess flood volume in the preset period. Among them, V A (m) represents the cumulative flood diversion capacity, m represents the number of flood storage and detention areas in use, Wc represents the excess flood volume, and V a (k) represents the flood diversion volume of the kth flood storage and detention area, and q represents the total number of flood storage and detention areas; In the flood diversion plan, the flood diversion capacity of the gates in the flood storage and detention areas is greater than or equal to the excess flood peak during the preset period; Q cap ≥Q c (t1), where Q cap Q represents the flood diversion capacity of the gates in the various flood storage and detention areas. c (t1) represents the excess flood peak when the maximum flow exists at time t1 in the preset time period [T1, T2]; And the water level after flood diversion using the flood diversion scheme is lower than the guaranteed water level; Z ay (r)≥Z g Among them, Z ay (r) represents the water level at the y-th flood control station after the implementation of the r-th scheme, Z. g To maintain water levels; The final order of use of flood storage and detention areas is as follows: first, important flood storage and detention areas in the upstream flood storage and detention area group; then, general flood storage and detention areas in the upstream flood storage and detention area group; and finally, flood storage and detention reserve areas in the upstream flood storage and detention area group. Then, the downstream flood storage and detention area group will be activated in sequence according to the location of the river section. Determine the excess flood peak and excess flood volume of the middle and lower reaches of the main stream in each river section after the reservoir group operation is scheduled, including: Select any reservoir in any group of reservoirs in any current river segment as the current reservoir; determine any moment in the preset time period as the current moment; Determine the inflow rate of the uncontrolled section of the reservoir and the measured flow rate at the reservoir control station at the current time; wherein, using a lumped hydrological model or an improved distributed hydrological model, calculate the inflow rate Q of the uncontrolled section of the i-th reservoir at time t (t∈[T1,T2]). in2i (t), where T1 is the initial time of the preset time period [T1, T2], and T2 is the end time of the preset time period [T1, T2]. Based on the inflow rate in the uncontrolled section and the measured flow rate at the inflow control station at the current moment, determine the inflow flood volume of the reservoir at the current moment; where Q is the measured flow rate Q of the inflow control station of the i-th reservoir at time t. in1i (t) and the inflow rate Q in the uncontrolled area in2i Given (t), the inflow flood volume Q of the i-th reservoir at time t is obtained using the Muskingen piecewise algorithm. ini (t); Based on the inflow flood volume to the reservoir at the current moment, the outflow flood volume to the reservoir at the current moment is determined using a reservoir group flood control model; where Q is the inflow flood volume to the reservoir at the current moment. ini (t) is the input, and the outflow flood Q of the i-th reservoir at time t is calculated based on the reservoir group flood regulation model after flood interception, peak reduction, and peak staggering. outi (t); Based on the current outflow flood volume of all reservoirs in the current river segment, determine the current inflow boundary; where Q is the threshold. outi (t) is the input, and the Muskingen piecewise algorithm is used to calculate the flow process from the i-th reservoir to the control section of the main stream and tributary at time t. This serves as the inflow boundary Q at time t for the calculation of the main stream of the middle and lower reaches of the plain. o (t); Based on the current inflow boundary, determine the pre-flood diversion water level and pre-flood diversion flow rate of the main control stations in the current river section; where, based on Q... o (t), the inflow of the middle and lower reaches of the main stream is calculated by using a hydrodynamic model, and the pre-flood level Z(t) and pre-flood flow Q(t) of the main control station at time t are obtained; Obtain the safe discharge capacity for the current river section; Based on the safe discharge and the pre-diversion flow at each moment during the preset time period of the main control station in the current river section, calculate the excess flood peak and excess flood volume of the current river section during the preset time period; wherein, according to Q(t) and the safe discharge Q s The excess flood peak Q was calculated. c (t1) and excess flood volume Wc are calculated using the following formulas: Q c (t1)=MAX(Q(t))-Q s ,t∈[T1,T2]; Wc=SUM(Q j (t2)-Q s ); Among them, Q j (t2) represents the pre-diversion flow rate at each moment in the preset time period [T1, T2] where the pre-diversion flow rate exceeds the safe discharge rate; MAX() is the maximum function; SUM() is the summation function; SUM(Q j (t2)-Q s This refers to the total volume of water exceeding the safe discharge capacity before flood diversion. MAX(Q(t)) is the maximum flow rate within the preset time period [T1, T2], i.e., the peak flow rate; Q c (t1) represents the excess flood peak corresponding to the maximum flow rate at time t1 in the preset time period [T1, T2].

2. The method for determining flood diversion strategies in flood storage and detention areas based on a balance perspective as described in claim 1, characterized in that, Determine the flood diversion volume and flood level reduction under each set combination of flood diversion parameters, including: Based on the set flood diversion flow, the number of set flood diversion dates, and the set flood diversion duration for each set flood diversion parameter combination, calculate the flood diversion volume under the corresponding set flood diversion parameter combination; The flood diversion volume under each set flood diversion parameter combination is used to determine the corresponding flood level reduction value under that set flood diversion parameter combination.

3. The method for determining flood diversion strategies in flood storage and detention areas based on a balance perspective as described in claim 1, characterized in that, Based on the objective function and constraints, a flood diversion scheme is selected as the objective scheme from the various flood diversion schemes. After the flood diversion is implemented, the following steps are included: The reduction in flood level under the target flood diversion scheme is calculated based on the water level after the flood diversion using the target scheme and the water level before the flood diversion using the target scheme.

4. A computer device, comprising: The memory and processor contain a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the method for determining flood diversion strategies based on a balance perspective as described in any one of claims 1-3.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method for determining flood diversion strategies based on a balance perspective for flood storage and detention areas as described in any one of claims 1-3.

6. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method for determining flood diversion strategies based on a balance perspective for flood storage and detention areas as described in any one of claims 1-3.

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