Method and device for improving flood discharge capacity of river channel in plain river network area

Abstract

The invention relates to the technical field of river channel flood discharge, and discloses a river channel flood discharge capacity improving method and device for a plain river network district, and the method comprises the steps: obtaining the upstream and downstream water surface ratio drop, the overflowing flow, the water level of regions on both banks and the submerging condition of both banks of a target flood discharge river channel in the plain river network district in a historical flood discharge period; the upstream and downstream water surface gradient, the overflowing flow, the water levels of the areas on the two banks and the submerging conditions of the two banks are analyzed, and the flood discharge level of the target flood discharge river channel is determined; if the flood discharge level of the target flood discharge river channel does not conform to the flood discharge capacity of the flood discharge river channel design, the pump station design flow and the pump station stage number are obtained, and a multi-stage relay water lifting pump station arrangement scheme is determined based on the pump station design flow and the pump station stage number; and the pump stations in the target flood discharge river channel are scheduled and operated by using the multi-stage relay water lifting pump station layout scheme. The flood discharge capacity of the river channel in the plain river network area is improved, and flood disaster loss and influence are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of river flood discharge, in particular to a river flood discharge capacity improvement method and device for plain river network areas. BACKGROUND

[0002] The river channel gradient in plain river network areas is small, the water power is weak, the water flow is reciprocating and uncertain, the drainage is not smooth, and the flood drainage capacity is poor. In particular, under the influence of typhoon and rainstorm weather, when the large-scale plain river channel along the river is simultaneously subjected to the top support of downstream tidal water level, the flood discharge is not smooth, and water disaster events such as external flood and internal waterlogging are more likely to occur, causing great economic losses and social impacts.

[0003] The river flood discharge capacity is often related to water power. At present, the measures to improve the flood discharge capacity are often river dredging, widening the river channel, and reducing the riverbed. However, widening the river channel is constrained by the use of land, and increasing the river channel gradient is not feasible in plain river network areas, resulting in poor river flood discharge capacity in plain river network areas, and great flood disaster losses and impacts. SUMMARY

[0004] Therefore, the present application provides a river flood discharge capacity improvement method and device for plain river network areas, which artificially adjusts the water level difference of each section of the river channel to solve the problem of poor river flood discharge capacity in plain river network areas and great flood disaster losses and impacts.

[0005] In a first aspect, the present application provides a river flood discharge capacity improvement method for plain river network areas, which comprises:

[0006] Obtaining the upstream and downstream water surface gradients, flow discharge, water level of both banks, and inundation of both banks of the target flood discharge river channel in the plain river network area during the historical flood discharge period;

[0007] Analyzing the upstream and downstream water surface gradients, flow discharge, water level of both banks, and inundation of both banks to determine the flood discharge level of the target flood discharge river channel;

[0008] If the flood discharge level of the target flood discharge river channel does not meet the design flood discharge capacity of the flood discharge river channel, obtaining the design flow of the pump station and the number of stages of the pump station, and determining a multi-stage relay water lifting pump station layout scheme based on the design flow of the pump station and the number of stages of the pump station;

[0009] Scheduling and operating the pump stations in the target flood discharge river channel using the multi-stage relay water lifting pump station layout scheme.

[0010] The method for improving the flood discharge capacity of a river channel in a plain river network region provided in this embodiment improves the flood discharge capacity of a river channel in a plain river network region, reduces flood disaster losses and influences by evaluating the flood discharge level of a target flood discharge river channel, determining a multi-stage relay water pumping station layout scheme for the target flood discharge river channel based on the flood discharge level of the target flood discharge river channel, and scheduling and operating the pump stations in the target flood discharge river channel based on the multi-stage relay water pumping station layout scheme.

[0011] In an optional implementation, the upstream and downstream water surface gradients, the flow discharge, the water levels on both banks, and the submergence on both banks are analyzed to determine the flood discharge level of the target flood discharge river channel, including:

[0012] The water surface gradient threshold is obtained, and the upstream and downstream water surface gradients are compared with the water surface gradient threshold;

[0013] The flood discharge channel design flow is obtained, and the flow discharge is compared with the flood discharge channel design flow;

[0014] The flood discharge channel two-bank water level threshold is obtained, and the water levels on both banks are compared with the flood discharge channel two-bank water level threshold;

[0015] The flood discharge channel two-bank submergence threshold is obtained, and the submergence on both banks is compared with the flood discharge channel two-bank submergence threshold;

[0016] If the upstream and downstream water surface gradients are less than the water surface gradient threshold, the flow discharge is less than the flood discharge channel design flow, the water levels on both banks are greater than the flood discharge channel two-bank water level threshold, and the submergence on both banks is greater than the flood discharge channel two-bank submergence threshold, then the flood discharge level of the target flood discharge river channel does not meet the design flood discharge capacity of the flood discharge river channel.

[0017] The method for improving the flood discharge capacity of a river channel in a plain river network region provided in this embodiment determines the flood discharge level of the target flood discharge river channel based on the upstream and downstream water surface gradients, the flow discharge, the water levels on both banks, and the submergence on both banks, thereby achieving comprehensive evaluation of the flood discharge level of the target flood discharge river channel and laying a foundation for subsequent improvement of the flood discharge capacity of the river channel.

[0018] In an optional implementation, if the flood discharge level of the target flood discharge river channel does not meet the design flood discharge capacity of the flood discharge river channel, the pump station design flow and the pump station stage number are obtained, and a multi-stage relay water pumping station layout scheme is determined based on the pump station design flow and the pump station stage number, including:

[0019] If the flood discharge level of the target flood discharge river channel does not meet the design flood discharge capacity of the flood discharge river channel, the design flow of the target flood discharge river channel in a free flow state is obtained, and the pump station design flow is determined based on the design flow of the target flood discharge river channel in the free flow state;

[0020] The river channel data of the target flood discharge river channel is obtained, and a one-dimensional Saint-Venant equation set is established based on the river channel data;

[0021] solving the one-dimensional Saint-Venant equation set, water level and flow data at different spatial positions of the river channel are obtained;

[0022] determining the number of pump stations based on the water level and flow data at different spatial positions of the river channel;

[0023] determining the multi-stage relay water pumping station layout scheme based on the design flow of the pump station and the number of pump stations.

[0024] The river channel flood discharge capacity improvement method provided in the embodiment accurately describes the river network flow movement through the one-dimensional Saint-Venant equation set, and accurately calculates the water level and flow process at different spatial positions in the flood discharge river channel by solving the one-dimensional Saint-Venant equation set, thereby determining the number of pump stations based on the water level and flow data at different spatial positions of the river channel, and determining the multi-stage relay water pumping station layout scheme based on the design flow of the pump station and the number of pump stations, so that the multi-stage relay water pumping station layout scheme is more in line with the actual situation, and the optimized river channel flood discharge capacity is improved, and the loss and influence of flood disasters are reduced.

[0025] In an optional implementation, the one-dimensional Saint-Venant equation set is established based on the river channel data, wherein the expression of the one-dimensional Saint-Venant equation set is:

[0026]

[0027] wherein A represents the shape of the river channel section, Q represents the section flow, t represents time, x represents spatial coordinates determined by the length of the river channel, g represents gravitational acceleration, h represents the section water level, R represents the hydraulic radius, N represents the roughness, q represents the lateral inflow per unit width, and a represents the momentum correction coefficient.

[0028] In an optional implementation, the multi-stage relay water pumping station layout scheme is determined based on the design flow of the pump station and the number of pump stations; wherein the multi-stage relay water pumping station layout scheme is that based on the design flow of the pump station and the number of pump stations, a plurality of pump stations are arranged at a predetermined interval from upstream to downstream in the target flood discharge river channel, forming a multi-stage relay and series pump station device.

[0029] In an optional implementation, the multi-stage relay water pumping station layout scheme is used to schedule and operate the pump stations in the target flood discharge river channel, including:

[0030] obtaining the current water flow of the target flood discharge river channel, and if the current water flow of the target flood discharge river channel is less than the predetermined water flow, the pump stations in the target flood discharge river channel are opened step by step.

[0031] The method for improving the river flood discharge capacity in the plain river network region provided by the embodiment utilizes the multi-stage relay water pumping station layout scheme to schedule and operate the pump stations in the target river for flood discharge, and through the way of gradually increasing the kinetic energy and water level difference, the water power field of the weak power river network region in the plain is reshaped, and the river flood discharge capacity of the plain river network region is improved.

[0032] In the second aspect, the present application provides a device for improving the river flood discharge capacity in the plain river network region, and the device comprises:

[0033] The acquisition module is configured to acquire the upstream and downstream water surface gradients, the flow discharge, the water levels of the two banks, and the inundation of the two banks of the target river for flood discharge in the plain river network region during the historical flood discharge.

[0034] The analysis module is configured to analyze the upstream and downstream water surface gradients, the flow discharge, the water levels of the two banks, and the inundation of the two banks, and determine the flood discharge level of the target river for flood discharge.

[0035] The determination module is configured to, if the flood discharge level of the target river for flood discharge does not meet the design flood discharge capacity of the river for flood discharge, acquire the pump station design flow and the pump station stage number, and determine the multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number.

[0036] The scheduling module is configured to utilize the multi-stage relay water pumping station layout scheme to schedule and operate the pump stations in the target river for flood discharge.

[0037] In the third aspect, the present application provides a computer device, which comprises a memory and a processor, the memory and the processor are communicatively connected with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method for improving the river flood discharge capacity in the plain river network region according to the first aspect or any one of the corresponding embodiments thereof.

[0038] In the fourth aspect, the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make the computer perform the method for improving the river flood discharge capacity in the plain river network region according to the first aspect or any one of the corresponding embodiments thereof.

[0039] In the fifth aspect, the present application provides a computer program product, which comprises computer instructions, and the computer instructions are used to make the computer perform the method for improving the river flood discharge capacity in the plain river network region according to the first aspect or any one of the corresponding embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 is a flowchart of a river flood-carrying capacity improvement method in a plain river network area according to an embodiment of the present application;

[0042] Figure 2 is a flowchart of another river flood-carrying capacity improvement method in a plain river network area according to an embodiment of the present application;

[0043] Figure 3 is a flowchart of still another river flood-carrying capacity improvement method in a plain river network area according to an embodiment of the present application;

[0044] Figure 4 is a difference calculation grid diagram of a one-dimensional Saint-Venant equation set according to an embodiment of the present application;

[0045] Figure 5 is a schematic diagram of a multi-stage relay water pumping station layout scheme according to an embodiment of the present application;

[0046] Figure 6 is a structural block diagram of a river flood-carrying capacity improvement device in a plain river network area according to an embodiment of the present application;

[0047] Figure 7 is a hardware structure diagram of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0049] The embodiment of the present application provides a river flood discharge capacity improvement method for a plain river network area, and it is to be noted that the execution subject of the river flood discharge capacity improvement method for the plain river network area provided by the embodiment of the present application can be a river flood discharge capacity improvement device for the plain river network area, and the river flood discharge capacity improvement device for the plain river network area can be realized as part or all of an electronic device in a software, hardware or software and hardware combined manner, wherein the electronic device can be a server or a terminal, wherein the server in the embodiment of the present application can be a server, or a server cluster composed of multiple servers, and the terminal in the embodiment of the present application can be a smart phone, a personal computer, a tablet computer, a wearable device, a smart robot and other smart hardware devices. In the following method embodiment, the execution subject is taken as an example of the electronic device.

[0050] The embodiment of the present application provides a river flood discharge capacity improvement method for a plain river network area, and it is to be noted that the execution subject of the river flood discharge capacity improvement method for the plain river network area provided by the embodiment of the present application can be a river flood discharge capacity improvement device for the plain river network area, and the river flood discharge capacity improvement device for the plain river network area can be realized as part or all of an electronic device in a software, hardware or software and hardware combined manner, wherein the electronic device can be a server or a terminal, wherein the server in the embodiment of the present application can be a server, or a server cluster composed of multiple servers, and the terminal in the embodiment of the present application can be a smart phone, a personal computer, a tablet computer, a wearable device, a smart robot and other smart hardware devices. In the following method embodiment, the execution subject is taken as an example of the electronic device.

[0051] According to the embodiment of the present application, a river flood discharge capacity improvement method for a plain river network area is provided, and it is to be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0052] In the embodiment, a river flood discharge capacity improvement method for a plain river network area is provided, which can be used for the above-mentioned electronic device, Figure 1 is a flowchart of a river flood discharge capacity improvement method for a plain river network area according to the embodiment of the present application, as Figure 1 shown, the flowchart includes the following steps:

[0053] In step S101, the upstream and downstream water surface gradients, flow discharge, water level of both banks and inundation of both banks of the target flood discharge river in the plain river network area during the historical flood discharge period are obtained.

[0054] In step S102, the upstream and downstream water surface gradients, flow discharge, water level of both banks and inundation of both banks are analyzed to determine the flood discharge level of the target flood discharge river.

[0055] Step S103, if the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river, the design flow of the pump station and the number of stages of the pump station are obtained, and the multi-stage relay water pumping station layout scheme is determined based on the design flow of the pump station and the number of stages of the pump station.

[0056] Step S104, scheduling and running the pump station in the target flood discharge river by using the multi-stage relay water pumping station layout scheme.

[0057] Specifically, the current water flow of the target flood discharge river is obtained, and if the current water flow of the target flood discharge river is less than the preset water flow, the pump stations in the target flood discharge river are opened step by step.

[0058] Further, when the upstream or section of the target flood discharge river experiences heavy rain, the downstream is subjected to tide uplift, the river discharge is not smooth, the water level of the river system on both banks is continuously high, and the regional flooding situation is serious, the implementation of pump station scheduling needs to be considered; if the monitoring flow of the flood discharge river is less than 50% of the design flow (i.e. the preset water flow), the pump stations are opened step by step, and the number of pump stations in operation is controlled by the monitoring water level on both banks not exceeding the flood control control water level.

[0059] The method for improving the river flood discharge capacity in the plain river network area provided in this embodiment improves the river flood discharge capacity in the plain river network area and reduces the loss and influence of flood disasters by evaluating the flood discharge level of the target flood discharge river, determining the multi-stage relay water pumping station layout scheme in the target flood discharge river according to the flood discharge level of the target flood discharge river, and scheduling and running the pump station in the target flood discharge river by using the multi-stage relay water pumping station layout scheme.

[0060] In this embodiment, a method for improving the river flood discharge capacity in the plain river network area is provided, which can be used in the electronic device described above, Figure 2 is a flowchart of a method for improving the river flood discharge capacity in the plain river network area according to an embodiment of the present application, as Figure 2 shown, the flowchart includes the following steps:

[0061] Step S201, obtaining the upstream and downstream water surface gradient, flow rate, water level on both banks and both banks flooding situation of the target flood discharge river in the plain river network area during the historical flood discharge period.

[0062] Specifically, necessary data collection is carried out, the upstream and downstream water surface gradient, flow rate, water level on both banks and both banks flooding situation of the flood discharge river in the plain river network area during the flood discharge period are analyzed based on the historical rainfall, water level and flow rate data.

[0063] Further, the calculation formula of the upstream and downstream water surface gradient S b is as follows:

[0064]

[0065] wherein, ΔZ is the water surface elevation difference between upstream hydrological station 1 and downstream hydrological station 2 of the flood discharge river (unit: meter); L is the horizontal distance along the river between upstream hydrological station 1 and downstream hydrological station 2 of the flood discharge river (unit: meter).

[0066] Further, the flow rate is the flow rate monitoring statistical data of upstream hydrological station 1 of the flood discharge river during the rainstorm flood discharge, including the maximum flow rate Q max , the average flow rate during the rainstorm peak forming period , etc.; the water level of the two-bank area includes the highest water level Z max1 , Z max2 or the maximum one-day water level Z 1d , Z 2d of the representative water level station 1 and water level station 2 of the left bank and right bank area during the rainstorm; the two-bank inundation includes the flood inundation range S, the inundation depth D and the inundation duration T during the rainstorm.

[0067] Step S202, analyzing the upstream and downstream water surface gradient, the flow rate, the water level of the two-bank area and the two-bank inundation to determine the flood discharge level of the target flood discharge river.

[0068] Specifically, the above step S202 includes:

[0069] Step S2021, obtaining the water surface gradient threshold value, and comparing the upstream and downstream water surface gradient with the water surface gradient threshold value.

[0070] Step S2022, obtaining the design flow rate of the flood discharge river, and comparing the flow rate with the design flow rate of the flood discharge river.

[0071] Step S2023, obtaining the water level threshold value of the two-bank area of the flood discharge river, and comparing the water level of the two-bank area with the water level threshold value of the two-bank area of the flood discharge river.

[0072] Step S2024, obtaining the inundation threshold value of the two-bank area of the flood discharge river, and comparing the two-bank inundation with the inundation threshold value of the two-bank area of the flood discharge river.

[0073] Step S2025, if the upstream and downstream water surface gradient is less than the water surface gradient threshold value, the flow rate is less than the design flow rate of the flood discharge river, the water level of the two-bank area is greater than the water level threshold value of the two-bank area of the flood discharge river, and the two-bank inundation is greater than the inundation threshold value of the two-bank area of the flood discharge river, then the flood discharge level of the target flood discharge river does not meet the design capacity of the flood discharge river.

[0074] Specifically, if the upstream and downstream water surface gradient S b is very small (less than the water surface gradient threshold value), the maximum flow rate Q max or the average flow rate Z is the highest water level of the area on both sides of the flood drainage river below the design flow max1 、Z max2 or Z 1d 、Z 2d Large and long time to maintain high water level, both sides of the submerged area, and the water is difficult, indicating that the flood drainage river does not fully play its flood discharge capacity.

[0075] Step S203, if the flood level of the target flood drainage river does not meet the design capacity of the flood drainage river, the design flow of the pump station and the number of pump stations are obtained, and the multi-stage relay water pumping station layout scheme is determined based on the design flow of the pump station and the number of pump stations. For details, please refer to step S103 of the embodiment shown in Figure 1 , which will not be repeated here.

[0076] Step S204, the multi-stage relay water pumping station layout scheme is used to schedule and operate the pump station in the target flood drainage river. For details, please refer to step S104 of the embodiment shown in Figure 1 , which will not be repeated here.

[0077] The river flood drainage capacity improvement method provided in this embodiment can determine the flood level of the target flood drainage river by the upstream and downstream water surface gradient, flow rate, water level of the area on both sides of the river, and the submerged situation on both sides of the river, and realize comprehensive evaluation of the flood level of the target flood drainage river, laying a foundation for subsequent improvement of the river flood drainage capacity.

[0078] In this embodiment, a river flood drainage capacity improvement method for a plain river network area is provided, which can be used in the electronic device described above, Figure 3 is a flow chart of a river flood drainage capacity improvement method for a plain river network area according to an embodiment of the present application, as shown in Figure 3 , which includes the following steps:

[0079] Step S301, the upstream and downstream water surface gradient, flow rate, water level of the area on both sides of the river, and the submerged situation on both sides of the river of the target flood drainage river in the plain river network area during the historical flood drainage period are obtained. For details, please refer to step S201 of the embodiment shown in Figure 2 , which will not be repeated here.

[0080] Step S302, the upstream and downstream water surface gradient, flow rate, water level of the area on both sides of the river, and the submerged situation on both sides of the river are analyzed to determine the flood level of the target flood drainage river. For details, please refer to step S202 of the embodiment shown in Figure 2 , which will not be repeated here.

[0081] Step S303, if the flood level of the target flood drainage river does not meet the design flood drainage capacity of the flood drainage river, the design flow of the pump station and the number of pump stations are obtained, and the multi-stage relay water pumping station layout scheme is determined based on the design flow of the pump station and the number of pump stations.

[0082] Specifically, the step S303 comprises:

[0083] In step S3031, if the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river, the design flow of the target flood discharge river under the self-flow state is obtained, and the design flow of the pump station is determined based on the design flow of the target flood discharge river under the self-flow state.

[0084] Specifically, the design flow of the pump station should be close to the design capacity of the river under the self-flow state.

[0085] In step S3032, the river data of the target flood discharge river is obtained, and a one-dimensional Saint-Venant equation set is established based on the river data.

[0086] Specifically, the river data includes river cross-section shape, river length, cross-section flow, cross-section water level, hydraulic radius and other data of the flood discharge river.

[0087] Specifically, the Saint-Venant equation set (control equation) describes the water flow movement of the river network, including continuity equation and momentum equation, and the expression of the one-dimensional Saint-Venant equation set is:

[0088]

[0089] Wherein, A represents the river cross-section shape, Q represents the cross-section flow, t represents the time, x represents the spatial coordinate, which is determined by the river length, g represents the gravity acceleration, h represents the cross-section water level, R represents the hydraulic radius, N represents the roughness, q represents the single-width side inflow, and a represents the momentum correction coefficient.

[0090] In step S3033, the one-dimensional Saint-Venant equation set is solved to obtain the water level flow data at different river spatial positions.

[0091] Specifically, the simultaneous continuity equation and energy equation is the one-dimensional Saint-Venant equation set, which is discretely solved by Abbott-Ionescu (a kind of discrete method) six-point implicit finite difference format; wherein, as shown in the following formula (1), the discrete format of the Saint-Venant equation set is: Figure 4

[0092] The continuity equation is:

[0093]

[0094] In the above formula, represents the cross-section flow of the j+1th river section in the n+1th time step, represents the cross-section flow of the jth river section in the n+1th time step, C j represents the first recursive coefficient, represents the water level of the j+1th river section in the n+1th time step, ​Dn+1j represents the water level of the jth river section in the nth+1 time step j Dn+1j represents the water level of the jth river section in the nth+1 time step

[0095] wherein C j and D j The calculation formula is as follows:

[0096]

[0097] wherein B represents the water surface width, Δx j represents the spatial step, Δt represents the time step, and θ represents the weight coefficient, Qn+1j+1 represents the cross-sectional flow of the j+1th river section in the nth time step, Qn+1j represents the cross-sectional flow of the jth river section in the nth time step, Dn+1j+1 represents the water level of the j+1th river section in the nth time step, Dn+1j represents the water level of the jth river section in the nth time step.

[0098] The momentum equation is:

[0099]

[0100] In the above formula, E j represents the third recursive coefficient, G j represents the fourth recursive coefficient, F j represents the fifth recursive coefficient, ψ j represents the sixth recursive coefficient.

[0101] wherein the calculation formula of the recursive coefficients E j , G j , F j , ψ j is as follows:

[0102]

[0103]

[0104]

[0105]

[0106] wherein u=Q / A represents the river section flow rate, α represents the momentum correction coefficient, and c represents the Chezy coefficient.

[0107] Further, when the difference is solved, each pump station is divided by a regulating gate, the regulating gate is in the j-1th river section, and the cross-sectional flow before and after the gate is 0; the pump station intake pool is simulated in the j-2th river section, and the design flow q pumpIn the form of concentrated outflow, the pump station outlet pool is simulated in the jth river section, q pump In the form of concentrated inflow, the space step of the inlet pool and the outlet pool should be as small as possible; its expression is as follows:

[0108]

[0109] Wherein, Q j represents the cross-sectional flow in the jth river section, Q j-1 represents the cross-sectional flow in the j-1th river section, q j-2 represents the single-width lateral inflow in the j-2th river section, q j represents the single-width lateral inflow in the jth river section.

[0110] Further, the equation set is combined with the flow and water level initial conditions, the upstream flow boundary condition and the downstream water level boundary condition, and the iterative method is used to solve the flow and water level.

[0111] Step S3034, determining the number of pump stations based on the water level and flow data at different spatial positions of the river.

[0112] Specifically, the number of pump stations is solved by the one-dimensional Saint-Venant equation set controlled by the gate pump to obtain the water level and flow process at different spatial positions of the river, so as to realize the water level and flood discharge of the representative station hydrological station 1 and hydrological station 2, and the water level of the water level station 1 and the water level station 2 meet the local flood control requirements. At the same time, the economy and operation frequency of the pump station construction are considered, and the number of pump stations is comprehensively compared and demonstrated.

[0113] Step S3035, determining the multi-stage relay water lifting pump station layout scheme based on the design flow of the pump station and the number of pump stations.

[0114] Specifically, the multi-stage relay water lifting pump station layout scheme is to arrange multiple pump stations at a preset interval from upstream to downstream in the target flood discharge river based on the design flow of the pump station and the number of pump stations, and form a multi-stage relay and series pump station device.

[0115] Further, if the flood discharge capacity of the flood discharge river is not fully utilized, the following multi-stage relay water lifting pump station layout scheme is adopted for the target flood discharge river: a pump station (in the form of gate pump combination) is arranged every certain distance, multiple pump stations are arranged from upstream to downstream, forming a multi-stage relay and series water lifting pump station, and the water power is gradually distributed from upstream to downstream, the water surface slope is improved in sections, and the water power field of the weak power river network area in the plain is reshaped by gradually increasing the kinetic energy and water head difference, and the flood discharge capacity of the river network area in the plain is improved.

[0116] For example, as shown in Figure 5As shown, in the flood discharge river, from the upstream station 1 to the downstream hydrological station 2, a first-stage pump station P1, a second-stage pump station P2, a third-stage pump station P3,..., a multi-stage relay, series pump station device is formed, the water power and the water surface slope of each river section are gradually lifted, and the purpose of enhancing the flood discharge capacity is achieved.

[0117] Further, the pump station adopts the combination of the gate and the pump, the gate size is as large as possible, the flow capacity of the river itself is not narrowed as much as possible, and the design flow of the pump station should be close to the design capacity of the river in the self-flow state; the number of stages of the pump station is determined comprehensively according to the length of the river section, the water surface slope, the drainage flow during multiple large floods, the flood inundation on both sides, the flood control requirements and the like.

[0118] Step S304, the multi-stage relay water lifting pump station layout scheme is used to schedule and operate the pump station in the target flood discharge river. For details, please refer to Figure 2 Step S204 of the embodiment shown will not be repeated here.

[0119] The river flood discharge capacity improvement method provided in the embodiment accurately describes the river network flow movement through the one-dimensional Saint-Venant equation set, and accurately calculates the water level and flow process at different spatial positions in the flood discharge river by solving the one-dimensional Saint-Venant equation set, and then determines the number of stages of the pump station based on the water level and flow data at different spatial positions of the river, and determines the multi-stage relay water lifting pump station layout scheme based on the design flow of the pump station and the number of stages of the pump station, so that the multi-stage relay water lifting pump station layout scheme is more in line with the actual situation, the optimized river flood discharge capacity is improved, and the loss and influence of the flood disaster are reduced.

[0120] In the embodiment, a river flood discharge capacity improvement device for a plain river network area is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and contemplated.

[0121] The embodiment provides a river flood discharge capacity improvement device for a plain river network area, which comprises Figure 6 As shown, comprising:

[0122] The acquisition module 601 is configured to acquire the upstream and downstream water surface slopes, the flow discharge, the water level of the two banks and the inundation of the two banks of the target flood discharge river in the plain river network area during the historical flood discharge.

[0123] The analysis module 602 is configured to analyze the upstream and downstream water surface slopes, the flow discharge, the water level of the two banks and the inundation of the two banks, and determine the flood discharge level of the target flood discharge river.

[0124] The determination module 603 is configured to acquire the design flow of the pump station and determine the multi-stage relay water pumping station layout scheme based on the design flow of the pump station and the number of stages of the pump station if the flood discharge level of the target flood discharge river does not conform to the design flood discharge capacity of the flood discharge river.

[0125] The scheduling module 604 is configured to schedule and operate the pump stations in the target flood discharge river by using the multi-stage relay water pumping station layout scheme.

[0126] In some optional embodiments, the analysis module 602 includes:

[0127] The first comparison unit is configured to acquire the water surface slope threshold value, and compare the upstream and downstream water surface slopes with the water surface slope threshold value.

[0128] The second comparison unit is configured to acquire the design flow of the flood discharge river, and compare the flow discharge flow with the design flow of the flood discharge river.

[0129] The third comparison unit is configured to acquire the water level threshold value of the two banks of the flood discharge river, and compare the water level of the two banks with the water level threshold value of the two banks of the flood discharge river.

[0130] The fourth comparison unit is configured to acquire the submergence threshold value of the two banks of the flood discharge river, and compare the submergence condition of the two banks with the submergence threshold value of the two banks of the flood discharge river.

[0131] The judgment unit is configured to determine that the flood discharge level of the target flood discharge river does not conform to the design flood discharge capacity of the flood discharge river if the upstream and downstream water surface slopes are less than the water surface slope threshold value, the flow discharge flow is less than the design flow of the flood discharge river, the water level of the two banks is greater than the water level threshold value of the two banks of the flood discharge river, and the submergence condition of the two banks is greater than the submergence threshold value of the two banks of the flood discharge river.

[0132] In some optional embodiments, the determination module 603 includes:

[0133] The first determination unit is configured to acquire the design flow of the target flood discharge river in the self-flow state, and determine the design flow of the pump station based on the design flow of the target flood discharge river in the self-flow state if the flood discharge level of the target flood discharge river does not conform to the design flood discharge capacity of the flood discharge river.

[0134] The establishment unit is configured to acquire the river data of the target flood discharge river, and establish a one-dimensional Saint-Venant equation set based on the river data.

[0135] The solving unit is configured to solve the one-dimensional Saint-Venant equation set to obtain water level flow data at different river spatial positions.

[0136] The second determination unit is configured to determine the number of stages of the pump station based on the water level flow data at different river spatial positions.

[0137] The third determining unit is configured to determine the multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number.

[0138] In some optional embodiments, the expression of the one-dimensional Saint-Venant equation group in the establishing unit is:

[0139]

[0140] Wherein, A represents the river cross section shape, Q represents the cross section flow, t represents time, x represents the space coordinate, which is determined by the river length, g represents the gravity acceleration, h represents the cross section water level, R represents the hydraulic radius, N represents the roughness, q represents the single-width lateral inflow, and a represents the momentum correction coefficient.

[0141] In some optional embodiments, the multi-stage relay water pumping station layout scheme in the third determining unit is that, based on the pump station design flow and the pump station stage number, a plurality of pump stations are arranged at preset intervals from upstream to downstream in the target flood discharge river, forming a multi-stage relay and series pump station device.

[0142] In some optional embodiments, the scheduling module 604 is specifically configured to acquire the current water flow of the target flood discharge river, and if the current water flow of the target flood discharge river is less than the preset water flow, the pump stations in the target flood discharge river are opened step by step.

[0143] Further function descriptions of the above-mentioned various modules and units are the same as those of the above-mentioned corresponding embodiments, and will not be repeated here.

[0144] The river flood discharge capacity improving device in the plain river network area in the embodiment is presented in the form of a functional unit, and the unit herein refers to an ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit) circuit, a processor and a memory executing one or more software or fixed programs, and / or other devices that can provide the above-mentioned functions.

[0145] The embodiment of the present application also provides a computer device with the above-mentioned Figure 6 The river flood discharge capacity improving device in the plain river network area shown in the figure.

[0146] Please refer to Figure 7 , Figure 7 is a structural schematic diagram of a computer device provided by an optional embodiment of the present application, as Figure 7As shown, the computer device includes one or more processors 10, memory 20, and interfaces 30 for the various components to communicate with one another. The various components communicate through one or more buses, and can be mounted on a common motherboard or in other manners as appropriate. The processor 10 can execute instructions, for example, stored in the memory 20 or elsewhere to implement processes that the computer device is designed to perform, for example, the processes described herein. The computer device also includes one or more mass storage devices 40 for storing software Figure 7 The processor 10 is used as an example in the embodiments.

[0147] The processor 10 can be a central processing unit, a network processor, or a combination thereof. The processor 10 can further include a hardware chip. The hardware chip can be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device can be a complex programmable logic device, a field programmable logic device, a general array logic, or any combination thereof.

[0148] The memory 20 stores instructions that are executable by the at least one processor 10, so that the at least one processor 10 performs the method shown in the above embodiments.

[0149] The memory 20 can include a program region and a data region. The program region can store an operating system and application programs required by at least one function. The data region can store data created according to the use of the computer device, and the like. In addition, the memory 20 can include a high-speed random access memory, and can further include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some alternative embodiments, the memory 20 can optionally include a memory disposed remotely with respect to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0150] The memory 20 can include a volatile memory, such as a random access memory, and can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid state disk. The memory 20 can further include a combination of the above-mentioned kinds of memories.

[0151] The computer device further includes a communication interface 30 for the computer device to communicate with other devices or communication networks.

[0152] The embodiments of the present application further provide a computer readable storage medium, and the method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or stored in a remote storage medium or a non-transitory machine readable storage medium and downloaded to a local storage medium through network, so that the method described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can also include a combination of the above-mentioned memories. It can be understood that the computer, the processor, the microprocessor controller, or the programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0153] Part of the present application can be applied as a computer program product, for example, computer program instructions, when executed by a computer, the operation of the computer can invoke or provide the method and / or technical solutions according to the present application. Those skilled in the art should understand that the form of computer program instructions in computer readable medium includes but is not limited to source file, executable file, installation package file, etc. Correspondingly, the way of computer program instructions executed by computer includes but is not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Here, the computer readable medium can be any available computer readable storage medium or communication medium accessible to the computer.

[0154] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A method for improving the flood carrying capacity of a river channel in a plain river network region, characterized in that, The method comprises: obtaining upstream and downstream water surface gradients, flow discharge, water levels on both banks and inundation on both banks of a target flood discharge river in a plain river network area during a historical flood discharge period; analyzing the upstream and downstream water surface gradients, the flow discharge, the water levels on both banks and the inundation on both banks to determine a flood discharge level of the target flood discharge river; if the flood discharge level of the target flood discharge river does not meet a design flood discharge capacity of the flood discharge river, obtaining a pump station design flow and a pump station stage number, and determining a multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number; scheduling and operating the pump stations in the target flood discharge river by using the multi-stage relay water pumping station layout scheme.

2. The method of claim 1, wherein, The analysis of the upstream and downstream water surface gradients, the flow discharge, the water levels on both banks and the inundation on both banks to determine the flood discharge level of the target flood discharge river comprises: obtaining a water surface gradient threshold value, and comparing the upstream and downstream water surface gradients with the water surface gradient threshold value; obtaining a flood discharge river design flow, and comparing the flow discharge with the flood discharge river design flow; obtaining a flood discharge river two-bank water level threshold value, and comparing the water levels on both banks with the flood discharge river two-bank water level threshold value; obtaining a flood discharge river two-bank inundation threshold value, and comparing the inundation on both banks with the flood discharge river two-bank inundation threshold value; if the upstream and downstream water surface gradients are less than the water surface gradient threshold value, the flow discharge is less than the flood discharge river design flow, the water levels on both banks are greater than the flood discharge river two-bank water level threshold value, and the inundation on both banks is greater than the flood discharge river two-bank inundation threshold value, the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river.

3. The method of claim 1, wherein, If the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river, obtaining a pump station design flow and a pump station stage number, and determining a multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number, comprises: if the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river, obtaining a design flow of the target flood discharge river in a free flow state, and determining the pump station design flow based on the design flow of the target flood discharge river in the free flow state; obtaining river data of the target flood discharge river, and establishing a one-dimensional Saint-Venant equation set based on the river data; solving the one-dimensional Saint-Venant equation set to obtain water level and flow data at different river spatial positions; determining the pump station stage number based on the water level and flow data at the different river spatial positions; determining a multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number.

4. The method of claim 3, wherein, The one-dimensional Saint-Venant equation set is established based on the river data, and an expression of the one-dimensional Saint-Venant equation set is: wherein A represents a river cross-section shape, Q represents a cross-section flow, t represents time, x represents a spatial coordinate, g represents gravitational acceleration, h represents a cross-section water level, R represents a hydraulic radius, N represents roughness, q represents a single-width side inflow, and a represents a momentum correction coefficient.

5. The method of claim 3, wherein, The multi-stage relay water pumping station layout scheme is determined based on the pump station design flow and the pump station stage number, and the multi-stage relay water pumping station layout scheme is that, based on the pump station design flow and the pump station stage number, a plurality of pump stations are arranged at a preset interval from upstream to downstream in the target flood discharge river, and a multi-stage relay and series pump station device is formed.

6. The method of claim 1, wherein, The multi-stage relay water pumping station layout scheme is utilized to schedule and operate the pump stations in the target flood discharge river, and the scheduling and operating includes: The current water flow of the target flood discharge river is acquired, and if the current water flow of the target flood discharge river is less than a preset water flow, the pump stations in the target flood discharge river are sequentially started.

7. A device for improving the flood carrying capacity of a river in a plain river network region, characterized in that, The device includes: An acquisition module is configured to acquire the upstream and downstream water surface gradients, the flow discharge, the water levels of the two banks, and the inundation conditions of the two banks of a target flood discharge river in a plain river network area during historical flood discharge. An analysis module is configured to analyze the upstream and downstream water surface gradients, the flow discharge, the water levels of the two banks, and the inundation conditions of the two banks, and determine the flood discharge level of the target flood discharge river. A determination module is configured to acquire a pump station design flow and a pump station stage number if the flood discharge level of the target flood discharge river does not meet the design flood discharge capacity of the flood discharge river, and determine a multi-stage relay water pumping station layout scheme based on the pump station design flow and the pump station stage number. A scheduling module is configured to utilize the multi-stage relay water pumping station layout scheme to schedule and operate the pump stations in the target flood discharge river.

8. A computer device, comprising: It includes: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the river flood discharge capacity improvement method of the plain river network area in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing a computer to perform the river flood discharge capacity improvement method of the plain river network area in any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer instructions are used to cause a computer to perform the river flood discharge capacity improvement method of the plain river network area in any one of claims 1 to 6.

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