Method, device, equipment, storage medium and product for determining urban water surface ratio

Abstract

The present invention discloses a method, device, equipment, storage medium and product for determining the urban water surface ratio. The method includes parameterizing rivers, roads and plots in a target area according to the road network density and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface ratio calculation model; determining the target value of the effective service radius of the river according to the average elevation of the road and the river control water level; calculating the target value of the river width according to the target value of the effective service radius of the river and the river length; and determining the target water surface ratio of the target area according to the target value of the river width and the target value of the effective service radius of the river. It can integrate municipal drainage and water conservancy waterlogging drainage. The water surface ratio calculation process takes into account factors such as vertical elevation, effective service radius of the river, and river control water level, and takes into account the balance of the river network distribution, making the water surface ratio calculation result more scientific and reasonable, and providing a scientific basis for urban planning and construction and water safety governance.

Description

Technical Field

[0001] The present invention relates to the technical field of urban waterlogging prevention, and particularly relates to a method, device, equipment, storage medium and product for determining the urban water surface rate. Background Art

[0002] In the plain river network area, the terrain is flat and low-lying. Due to the backwater effect of the outer river tide level, the waterlogging cannot be drained into the outer river by itself and needs to be stored and regulated by rivers and lakes and then pumped into the outer river by pumping stations. Although "storage" and "drainage" are in a relationship of mutual growth and decline, the river bottom in the plain river network area is basically a flat slope and the water dynamics is poor. Simply increasing the scale of the pumping station cannot effectively solve the problem of the drainage backwater of the inner river high water level on the rainwater pipe network, especially when encountering short-duration heavy rainfall. Therefore, the prevention and control of urban waterlogging in the plain river network area highly depends on the appropriate regulated water surface rate.

[0003] Although the "Code for Urban Water System Planning" puts forward the appropriate water surface rate range according to China's geographical and hydrological characteristics, due to different statistical calibers and water system functions, there is still a lack of standardized guidance for the water surface rates corresponding to the inner rivers and lakes with the actual function of waterlogging prevention. Moreover, urban waterlogging prevention involves two aspects: municipal drainage and water conservancy waterlogging drainage. At present, the water surface rate is mainly calculated based on water conservancy waterlogging drainage, without considering the relevant factors of municipal drainage. Therefore, there are problems of deviation or distortion in the calculated water surface rate results in practical applications. Summary of the Invention

[0004] The present invention provides a method, device, equipment, storage medium and product for determining the urban water surface rate, which combines municipal drainage and water conservancy waterlogging drainage to determine the basic parameters of the water surface rate calculation model, takes the height difference between the vertical elevation and the controlled water level as the constraint condition, calculates the effective service radius of the river channel, and then calculates the river channel width to determine the urban water surface rate.

[0005] To achieve the above object, an embodiment of the present invention provides a method for determining the urban water surface rate, including:

[0006] Parametrize the river channels, roads and plots in the target area according to the road network density and the number density of rainwater discharge outlets per unit river channel length to obtain the basic parameters of the water surface rate calculation model; wherein, the basic parameters include: river channel length, river channel width, and effective service radius of the river channel;

[0007] Determine the target value of the effective service radius of the river channel according to the average elevation of the road and the controlled water level of the river channel;

[0008] Calculate the target value of the river channel width according to the target value of the effective service radius of the river channel and the river channel length;

[0009] Determine the target water surface rate of the target area according to the target value of the river channel width and the target value of the effective service radius of the river channel.

[0010] As an improvement to the above solution, parameterize the rivers, roads, and plots within the target area according to the road network density and the density of the number of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface ratio calculation model, including:

[0011] Obtain the vector map of the land use plan and the drainage engineering plan within the target area;

[0012] According to the vector map of the land use plan, obtain the road network density and the comprehensive runoff coefficient within the target area;

[0013] According to the drainage engineering plan, obtain the density of the number of rainwater discharge outlets per unit river length within the target area;

[0014] According to the road network density, the comprehensive runoff coefficient, and the density of the number of rainwater discharge outlets per unit river length, parameterize the rivers, roads, and plots within the target area to obtain the basic parameters of the water surface ratio calculation model.

[0015] As an improvement to the above solution, determining the target value of the effective service radius of the river according to the average road elevation and the river control water level includes:

[0016] Set the initial value of the effective service radius of the river; according to the initial value, calculate the head loss of the pipeline corresponding to the return period of waterlogging prevention;

[0017] If the elevation difference between the average road elevation and the river control water level is greater than the head loss of the pipeline, increment the effective service radius of the river;

[0018] According to the value of the effective service radius of the river after increment, calculate the head loss of the pipeline after increment until the elevation difference is equal to the head loss of the pipeline after increment, and obtain the target value of the effective service radius of the river.

[0019] As an improvement to the above solution, calculating the target value of the river width according to the target value of the effective service radius of the river and the river length includes:

[0020] Calculate the inflow discharge of the river according to the target value of the effective service radius of the river;

[0021] Determine the required storage volume of the river according to the inflow discharge of the river and the discharge of the drainage pumping station;

[0022] Calculate the target value of the river width according to the required storage volume of the river and the river length.

[0023] As an improvement to the above solution, calculating the inflow discharge of the river according to the target value of the effective service radius of the river includes:

[0024] According to the target value of the effective service radius of the river channel, determine the catchment area of the stormwater pipe network, and use the SWMM model to simulate the outflow of the stormwater pipe network discharge outlet;

[0025] According to the outflow of the stormwater pipe network discharge outlet, obtain the inflow of the river channel.

[0026] As an improvement of the above solution, the calculating the pipe head loss corresponding to the waterlogging prevention recurrence period according to the initial value includes:

[0027] Calculate the cross-sectional area of the stormwater pipe network according to the initial value;

[0028] Calculate the hydraulic gradient of the stormwater pipe network corresponding to the waterlogging prevention recurrence period according to the cross-sectional area of the stormwater pipe network;

[0029] Calculate the pipe head loss corresponding to the waterlogging prevention recurrence period according to the hydraulic gradient of the stormwater pipe network and the initial value.

[0030] To achieve the above object, an embodiment of the present invention provides a device for determining the urban water surface ratio, including:

[0031] A basic parameter conversion module, configured to parameterize the river channels, roads, and plots in the target area according to the road network density and the density of the number of stormwater discharge outlets per unit river channel length, to obtain the basic parameters of the water surface ratio calculation model; wherein, the basic parameters include: river channel length, river channel width, and effective service radius of the river channel;

[0032] A target value determination module, configured to determine the target value of the effective service radius of the river channel according to the average elevation of the road and the river channel control water level;

[0033] A target value calculation module, configured to calculate the target value of the river channel width according to the target value of the effective service radius of the river channel and the river channel length;

[0034] A water surface ratio determination module, configured to determine the target water surface ratio of the target area according to the target value of the river channel width and the target value of the effective service radius of the river channel.

[0035] To achieve the above object, an embodiment of the present invention correspondingly provides a device for determining the urban water surface ratio, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the above method for determining the urban water surface ratio is implemented.

[0036] To achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program. When the computer program runs, it controls the device where the computer-readable storage medium is located to execute the above-mentioned urban water surface rate determination method.

[0037] To achieve the above object, an embodiment of the present invention further provides a computer program product, which is stored in a storage medium and is executed by at least one processor to implement the steps of the above-mentioned urban water surface rate determination method.

[0038] Compared with the prior art, a method, device, equipment, storage medium and product for determining the urban water surface rate disclosed in the embodiments of the present invention parameterize the rivers, roads and plots in the target area according to the road network density and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface rate calculation model. Among them, the basic parameters include: river length, river width, and effective service radius of the river; determine the target value of the effective service radius of the river according to the average elevation of the road and the river control water level; calculate the target value of the river width according to the target value of the effective service radius of the river and the river length; determine the target water surface rate of the target area according to the target value of the river width and the target value of the effective service radius of the river. It can integrate municipal drainage and water conservancy waterlogging drainage. The water surface rate calculation process considers factors such as vertical elevation, effective service radius of the river, and river control water level, and takes into account the balance of the river network distribution, making the water surface rate calculation result more scientific and reasonable, improving the water safety resilience level, and providing a scientific basis for urban planning and construction and water safety governance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic flow chart of a method for determining the urban water surface rate provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of a device for determining the urban water surface rate provided by an embodiment of the present invention;

[0041] Figure 3 is a structural block diagram of a device for determining the urban water surface rate provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that the terms "including" and "specific" in the present invention, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0044] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of a method for determining the urban water surface rate provided by an embodiment of the present invention. The method for determining the urban water surface rate includes:

[0045] S1. Parametrize the rivers, roads, and plots in the target area according to the road network density and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface rate calculation model; wherein, the basic parameters include: river length, river width, and effective service radius of the river;

[0046] S2. Determine the target value of the effective service radius of the river according to the average elevation of the road and the river control water level;

[0047] S3. Calculate the target value of the river width according to the target value of the effective service radius of the river and the river length;

[0048] S4. Determine the target water surface rate of the target area according to the target value of the river width and the target value of the effective service radius of the river.

[0049] Exemplarily, the target water surface rate wherein, R f is the effective service radius of the river, and B is the river width.

[0050] Specifically, the step S1 includes:

[0051] S11. Obtain the vector map of the land use planning and the drainage engineering planning map in the target area;

[0052] S12. Obtain the road network density and the comprehensive runoff coefficient in the target area according to the vector map of the land use planning;

[0053] S13. Obtain the number density of rainwater discharge outlets per unit river length in the target area according to the drainage engineering planning map;

[0054] S14. Parametrize the rivers, roads, and plots in the target area according to the road network density, the comprehensive runoff coefficient, and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface rate calculation model.

[0055] Exemplarily, from the urban planning database, obtain the vector map of the land use plan and the drainage engineering plan within the target area. According to the vector map of the land use plan, determine the distribution of road networks, water networks, and plots within the target area. Calculate the road network density based on the road network, and determine the comprehensive runoff coefficient based on the terrain, watershed characteristic factors, average slope, surface vegetation conditions, and soil characteristics of the plots. Determine the distribution of the drainage pipe network within the target area according to the drainage engineering plan, and obtain the density of the number of rainwater discharge outlets per unit river length based on the drainage pipe network. The density of the number of rainwater discharge outlets per unit river length where N is the total number of rainwater discharge outlets of the drainage pipe network, and L z is the total length of the river. According to the road network density, the comprehensive runoff coefficient, and the density of the number of rainwater discharge outlets per unit river length, parameterize the rivers, roads, and plots within the target area to obtain the basic parameters of the water surface rate calculation model. For example, set the river length L to 1 km, the river width B (in m), and the effective service radius R of the river f (in m), then the total road length L D = 2×R f ×L×γ, where γ is the road network density; the length L of a single road perpendicular to the river d = 2×R f , and the number of single roads perpendicular to the river The length L of a single road parallel to the river p is equal to the river length L, and the number of single roads parallel to the river Construct the spatial structure of the road network and the river according to the principle that the spacing of the same type of roads is equal. Among them, the road spacing perpendicular to the river The road spacing parallel to the river The runoff coefficient of the plots surrounded by the roads is equal to the comprehensive runoff coefficient ψ. The rainwater pipe channels are laid along the roads, and the main pipe channels are the rainwater pipe channels laid along the roads perpendicular to the river.

[0056] Specifically, the step S2 includes:

[0057] S21, set the initial value of the effective service radius of the river; according to the initial value, calculate the head loss of the pipeline corresponding to the recurrence period of waterlogging prevention;

[0058] S22, if the elevation difference between the average elevation of the road and the control water level of the river is greater than the head loss of the pipeline, then increase the effective service radius of the river;

[0059] S23, according to the value of the increased effective service radius of the river, calculate the increased head loss of the pipeline until the elevation difference is equal to the increased head loss of the pipeline, and obtain the target value of the effective service radius of the river.

[0060] More specifically, calculating the pipeline head loss corresponding to the rainwaterlogging prevention recurrence period according to the initial value includes:

[0061] Calculating the cross-sectional area of the rainwater pipe according to the initial value;

[0062] Calculating the hydraulic gradient of the rainwater pipe corresponding to the rainwaterlogging prevention recurrence period according to the cross-sectional area of the rainwater pipe;

[0063] Calculating the pipeline head loss corresponding to the rainwaterlogging prevention recurrence period according to the hydraulic gradient of the rainwater pipe and the initial value.

[0064] It should be noted that under the condition of the rainwaterlogging prevention recurrence period, the rainwater pipes in the plain river network area are all submerged outflows. When the non-overflow of the rainwater inspection well is regarded as the rainwaterlogging prevention target, the difference between the average road elevation and the river control water level is equal to the pipeline head loss.

[0065] Exemplarily, considering that the effective service radius R of the river f is a basic parameter of the catchment area F of the rainwater pipe, the effective service radius R of the river is solved by an iterative method f , and the specific steps are as follows:

[0066] The initial value of the effective service radius R of the river can be assumed to be 100m (or 50m, 200m, etc.). According to the initial value, the cross-sectional area A of the rainwater pipe is calculated. According to the cross-sectional area A of the rainwater pipe, the hydraulic gradient I of the rainwater pipe corresponding to the rainwaterlogging prevention recurrence period is calculated; then, according to the hydraulic gradient I of the rainwater pipe and the initial value of 100m, the pipeline head loss G corresponding to the rainwaterlogging prevention recurrence period is calculated f = R f × I × (1 + β), where β is the local head loss coefficient, and the empirical value of β is 0.2. If the elevation difference between the average road elevation H f and the river control water level H g is greater than the pipeline head loss G s (H f - H g > G s ), then the effective service radius R of the river f is incremented by a certain length (such as 20m); repeat the calculation until H f - H g is approximately equal to G s , and the target value of the effective service radius R of the river f is obtained. f The target value.

[0067] Furthermore, the cross-sectional area of the rainwater pipe where Q gFor the design flow rate of stormwater pipes corresponding to the design rainfall return period, according to the provisions of the "Design Standard for Outdoor Drainage" (GB 50014-2021), the size of stormwater pipes is calculated according to the design rainfall return period, generally taking P = 2 years, 3 years, 5 years or 10 years. The design flow rate of stormwater pipes corresponding to the design rainfall return period q is the rainfall intensity corresponding to the design rainfall return period, ψ is the comprehensive runoff coefficient, and F is the catchment area of stormwater pipes. v is the flow velocity of stormwater pipes. In order to effectively respond to rainfall with high standards for waterlogging prevention (such as once in 50 years, once in 100 years), the cross-sectional area of the pipe should be taken as a high value. Therefore, the design flow velocity of stormwater pipes is taken as the minimum value of 0.75 m / s in the specification.

[0068] Furthermore, according to the flow formula Q n = A × v and the flow velocity formula the hydraulic gradient of stormwater pipes corresponding to the waterlogging prevention return period is derived where n is the roughness coefficient of stormwater pipes, Q n is the stormwater design flow rate corresponding to the waterlogging prevention return period, and R is the hydraulic radius of stormwater pipes.

[0069] Specifically, the step S3 includes:

[0070] S31, calculate the river inflow according to the target value of the effective service radius of the river;

[0071] S32, determine the required storage volume of the river according to the river inflow and the drainage pump station flow rate;

[0072] S33, calculate the target value of the river width according to the required storage volume of the river and the river length.

[0073] More specifically, the step S31 includes:

[0074] S311, determine the catchment area of stormwater pipes according to the target value of the effective service radius of the river, and use the SWMM model to simulate the outflow of stormwater pipe outlets;

[0075] S312, obtain the river inflow according to the outflow of stormwater pipe outlets.

[0076] Exemplarily, according to the target value of the effective service radius R f of the river, determine the catchment area of stormwater pipes, use the SWMM model to simulate the outflow of stormwater pipe outlets, and accumulate the outflows of all stormwater pipe outlets at the same time as the river inflow Q under the condition of the waterlogging prevention return period; record the moments when the river inflow Q is equal to the drainage pump station flow rate Q min as t m 、tm+τ , then, t m to t m+τ The closed area formed by the curve of the river inflow discharge and the curve of the drainage pumping station discharge within the time period is the river storage volume V. Divide the time period from t m to t m+τ into several equal time periods Δt. The river storage volume required by the river where, Q m is the river inflow at time t m , Q m+Δt is the river inflow at time t m+Δt , Q m+2Δt is the river inflow at time t m+2Δt , Q m+τ-Δt is the river inflow at time t m+τ-Δt , Q m+τ is the river inflow at time t m+τ , Q m to time t m+τ ; the river is generalized as a rectangle, and the river width where, H s is the river control water level; H 0 is the normal water level of the river, H 0 takes the average water level of the outer river, and L is the river length.

[0077] Furthermore, under the condition of the recurrence period of waterlogging prevention, the drainage pumping station discharge where, ψ is the comprehensive runoff coefficient; S is the river catchment area, and H T is the rainfall of the design rainfall; T is the drainage design rainfall duration, and T is generally 24h.

[0078] It should be noted that the embodiment of the present invention takes the waterlogging mechanism in the plain river network area as the entry point, integrates the two majors of municipal drainage and water conservancy waterlogging drainage, constructs the basic parameters of the water surface rate calculation model based on the road network density and the number density of rainwater discharge outlets per unit river length, takes the height difference between the vertical elevation and the control water level as the constraint condition, calculates the effective service radius of the river by an iterative method, further calculates the river inflow discharge, and calculates the river storage volume and river width required by the river under the standard condition of the recurrence period of waterlogging prevention with the minimum pump station scale as the constraint condition, and calculates the water surface rate.

[0079] Furthermore, after the step S4, the method further includes:

[0080] S5, perform a water safety plan for the target area according to the target water surface rate.

[0081] Exemplarily, the target water surface ratio is applied to urban water system planning, drainage and waterlogging prevention planning, flood control and drainage planning, and waterlogging treatment. For example, by comparing the target water surface ratio with the current water surface ratio of the drainage sub-region, the gap of the water surface ratio is calculated, so as to more scientifically formulate measures to make up for the short board of the water storage space and improve the resilience level of urban water safety; the target water surface ratio is applied to the delimitation of the urban development boundary. For example, according to the calculation method of the target water surface ratio, the construction land scale and development boundary that can be carried by the current river and lake waters are calculated, so as to better support the construction and development of the city.

[0082] A method for determining the urban water surface ratio disclosed in an embodiment of the present invention parameterizes rivers, roads, and plots in a target area according to the road network density and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface ratio calculation model; wherein, the basic parameters include: river length, river width, and effective service radius of the river; the target value of the effective service radius of the river is determined according to the average road elevation and the river control water level; the target value of the river width is calculated according to the target value of the effective service radius of the river and the river length; the target water surface ratio of the target area is determined according to the target value of the river width and the target value of the effective service radius of the river. It can integrate municipal drainage and waterlogging removal by water conservancy. The water surface ratio calculation process takes into account factors such as vertical elevation, effective service radius of the river, river control water level, and scale of drainage pumping stations, and takes into account the balance degree of river network distribution. Based on the outflow of the drainage pipe network, the inflow of the river is calculated, which is more in line with the rainwater confluence process, making the water surface ratio calculation result more scientific and reasonable, improving the water safety resilience level, and providing a scientific basis for urban planning and construction and water safety governance.

[0083] See Figure 2 , Figure 2 is a schematic structural diagram of an urban water surface ratio determination device 10 provided by an embodiment of the present invention. The urban water surface ratio determination device 10 includes:

[0084] The basic parameter conversion module 11 is used to parameterize rivers, roads, and plots in a target area according to the road network density and the number density of rainwater discharge outlets per unit river length to obtain the basic parameters of the water surface ratio calculation model; wherein, the basic parameters include: river length, river width, and effective service radius of the river;

[0085] The target value determination module 12 is used to determine the target value of the effective service radius of the river according to the average road elevation and the river control water level;

[0086] The target value calculation module 13 is used to calculate the target value of the river width according to the target value of the effective service radius of the river and the river length;

[0087] The water surface ratio determination module 14 is configured to determine the target water surface ratio of the target area according to the target value of the river width and the target value of the effective service radius of the river channel.

[0088] Specifically, the basic parameter conversion module 11 is configured to:

[0089] Obtain the vector map of the land use plan and the drainage engineering plan within the target area;

[0090] According to the vector map of the land use plan, obtain the road network density and the comprehensive runoff coefficient within the target area;

[0091] According to the drainage engineering plan, obtain the number density of rainwater discharge outlets per unit river channel length within the target area;

[0092] According to the road network density, the comprehensive runoff coefficient, and the number density of rainwater discharge outlets per unit river channel length, parameterize the river channels, roads, and plots within the target area to obtain the basic parameters of the water surface ratio calculation model.

[0093] Specifically, the target value determination module 12 is configured to:

[0094] Set the initial value of the effective service radius of the river channel; according to the initial value, calculate the pipeline head loss corresponding to the waterlogging prevention recurrence period;

[0095] If the elevation difference between the average road elevation and the river channel control water level is greater than the pipeline head loss, increment the effective service radius of the river channel;

[0096] According to the value of the incremented effective service radius of the river channel, calculate the incremented pipeline head loss until the elevation difference is equal to the incremented pipeline head loss to obtain the target value of the effective service radius of the river channel.

[0097] Specifically, the target value calculation module 13 is configured to:

[0098] According to the target value of the effective service radius of the river channel, calculate the river channel inflow;

[0099] According to the river channel inflow and the drainage pumping station flow, determine the required storage volume of the river channel;

[0100] According to the required storage volume of the river channel and the river channel length, calculate the target value of the river channel width.

[0101] More specifically, the calculating the river channel inflow according to the target value of the effective service radius of the river channel includes:

[0102] Determine the rainwater pipe network catchment sub - areas according to the target value of the effective service radius of the river channel, and use the SWMM model to simulate the outflow of the rainwater pipe network discharge outlets;

[0103] Obtain the river channel inflow according to the outflow of the rainwater pipe network discharge outlets.

[0104] More specifically, the calculating the pipeline head loss corresponding to the waterlogging prevention recurrence period according to the initial value includes:

[0105] Calculate the cross - sectional area of the rainwater pipe network according to the initial value;

[0106] Calculate the hydraulic gradient of the rainwater pipe network corresponding to the waterlogging prevention recurrence period according to the cross - sectional area of the rainwater pipe network;

[0107] Calculate the pipeline head loss corresponding to the waterlogging prevention recurrence period according to the hydraulic gradient of the rainwater pipe network and the initial value.

[0108] Furthermore, the urban water surface ratio determination device 10 further includes:

[0109] A water surface ratio application module, configured to perform water safety planning for the target area according to the target water surface ratio.

[0110] The urban water surface ratio determination device 10 provided by the embodiments of the present invention can implement all the processes of the urban water surface ratio determination method in the above - mentioned embodiments. The functions of each module in the device and the achieved technical effects respectively correspond to the functions and achieved technical effects of the urban water surface ratio determination method in the above - mentioned embodiments, and will not be elaborated here.

[0111] See Figure 3 , Figure 3 is a schematic structural diagram of an urban water surface ratio determination device 20 provided by an embodiment of the present invention. The urban water surface ratio determination device 20 in this embodiment includes: a processor 21, a memory 22, and a computer program stored in the memory 22 and executable on the processor 21. When the processor 21 executes the computer program, the steps in the embodiments of the above - mentioned urban water surface ratio determination method are implemented. Or, when the processor 21 executes the computer program, the functions of each module in the embodiments of the above - mentioned urban water surface ratio determination device are implemented.

[0112] Exemplarily, the computer program can be divided into one or more modules. The one or more modules are stored in the memory 22 and executed by the processor 21 to complete the present invention. The one or more modules can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the urban water surface ratio determination device 20.

[0113] The urban water surface ratio determination device 20 may be a computing device such as a desktop computer, a notebook, a palm computer, or a cloud server. The urban water surface ratio determination device 20 may include, but is not limited to, a processor 21 and a memory 22. Those skilled in the art can understand that the schematic diagram is only an example of the urban water surface ratio determination device 20 and does not constitute a limitation on the urban water surface ratio determination device 20. It may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the urban water surface ratio determination device 20 may further include an input / output device, a network access device, a bus, etc.

[0114] The so-called processor 21 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor 21 is the control center of the urban water surface ratio determination device 20, and connects all parts of the entire urban water surface ratio determination device 20 through various interfaces and lines.

[0115] The memory 22 can be used to store the computer programs and / or modules. The processor 21 realizes various functions of the urban water surface ratio determination device 20 by running or executing the computer programs and / or modules stored in the memory 22, and by calling the data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area. Among them, the program storage area may store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area may store data created according to the use of the mobile phone (such as audio data, phone book, etc.). In addition, the memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0116] Among them, if the modules integrated in the urban water surface ratio determination device 20 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor 21, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0117] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided by the present invention, the connection relationships between the modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement without creative efforts.

[0118] The embodiment of the present invention also provides a computer-readable storage medium. The computer-readable storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the urban water surface ratio determination method as described in the above embodiment.

[0119] In addition, the embodiment of the present invention also provides a computer program product. The computer program product is stored in a storage medium, and the program product is executed by at least one processor to implement the steps of the urban water surface ratio determination method as described in the above embodiment.

[0120] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for determining urban water surface rate, characterized in that: include: According to the road network density and the density of the number of rainwater outlets per unit river length, the rivers, roads and plots in the target area are parameterized to obtain the basic parameters of the water surface rate calculation model; wherein the basic parameters include: river length, river width and river effective service radius; Determine the target value of the effective service radius of the river according to the average elevation of the road and the controlled water level of the river; Calculating a target value of the river channel width according to the target value of the effective service radius of the river channel and the length of the river channel; Determining a target water surface rate of the target area according to a target value of the river channel width and a target value of the river channel effective service radius; Wherein, determining the target value of the effective service radius of the river according to the average elevation of the road and the controlled water level of the river includes: An initial value of the effective service radius of the river channel is set; based on the initial value, the pipeline head loss corresponding to the recurrence period of waterlogging prevention and control is calculated; If the elevation difference between the average elevation of the road and the controlled water level of the river is greater than the pipeline head loss, the effective service radius of the river is increased; According to the value of the increased effective service radius of the river channel, the increased pipeline head loss is calculated until the elevation difference is equal to the increased pipeline head loss, and the target value of the effective service radius of the river channel is obtained.

2. The method for determining the urban water surface rate according to claim 1, characterized in that: According to the road network density and the number density of rainwater outlets per unit river length, the rivers, roads and plots in the target area are parameterized to obtain the basic parameters of the water surface rate calculation model, including: Obtaining the land use planning vector map and drainage engineering planning map in the target area; According to the land use planning vector map, obtaining the road network density and comprehensive runoff coefficient in the target area; According to the drainage project planning map, obtaining the number density of rainwater discharge outlets per unit river length in the target area; According to the road network density, the comprehensive runoff coefficient and the density of the number of rainwater discharge outlets per unit river length, the rivers, roads and plots in the target area are parameterized to obtain the basic parameters of the water surface rate calculation model.

3. The method for determining the urban water surface rate according to claim 1, characterized in that: The calculating the target value of the river channel width according to the target value of the river channel effective service radius and the river channel length includes: Calculating the inflow flow of the river channel according to the target value of the effective service radius of the river channel; Determine the required storage capacity of the river according to the inflow flow of the river and the flow of the drainage pump station; The target value of the river channel width is calculated based on the required storage capacity of the river channel and the length of the river channel.

4. The method for determining the urban water surface rate according to claim 3, characterized in that: The calculating the river inflow flow according to the target value of the river effective service radius includes: According to the target value of the effective service radius of the river channel, the rainwater pipe catchment area is determined, and the outflow of the rainwater pipe outlet is simulated by using the SWMM model; The inflow flow of the river is obtained according to the outflow flow of the stormwater pipe discharge outlet.

5. The method for determining the urban water surface rate according to claim 1, characterized in that: The calculating, based on the initial value, the pipeline head loss corresponding to the waterlogging prevention and control return period comprises: Calculate the cross-sectional area of ​​the rainwater pipe according to the initial value; According to the cross-sectional area of ​​the rainwater pipe, the hydraulic gradient of the rainwater pipe corresponding to the return period of waterlogging prevention and control is calculated; The pipeline head loss corresponding to the waterlogging prevention and control recurrence period is calculated based on the rainwater pipe hydraulic gradient and the initial value.

6. A device for determining urban water surface rate, characterized in that: include: The basic parameter conversion module is used to parameterize the rivers, roads and plots in the target area according to the road network density and the number density of rainwater outlets per unit river length, and obtain the basic parameters of the water surface rate calculation model; wherein the basic parameters include: river length, river width and river effective service radius; A target value determination module, used to determine the target value of the effective service radius of the river channel according to the average elevation of the road and the controlled water level of the river channel; A target value calculation module, used for calculating the target value of the river channel width according to the target value of the effective service radius of the river channel and the length of the river channel; A water surface rate determination module, used to determine a target water surface rate of the target area according to a target value of the river channel width and a target value of the river channel effective service radius; Wherein, the target value determination module is used to: An initial value of the effective service radius of the river channel is set; based on the initial value, the pipeline head loss corresponding to the recurrence period of waterlogging prevention and control is calculated; If the elevation difference between the average elevation of the road and the controlled water level of the river is greater than the pipeline head loss, the effective service radius of the river is increased; According to the value of the increased effective service radius of the river channel, the increased pipeline head loss is calculated until the elevation difference is equal to the increased pipeline head loss, and the target value of the effective service radius of the river channel is obtained.

7. A device for determining urban water surface rate, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for determining the urban water surface rate according to any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the urban water surface ratio determination method according to any one of claims 1 to 5.

9. A computer program product, characterized in that The computer program product is stored in a storage medium, and the program product is executed by at least one processor to implement the steps of the urban water surface ratio determination method as described in any one of claims 1-5.

Images