Urban water surface rate determination method, device and equipment, storage medium and product

Abstract

The invention discloses an urban water surface rate determination method, device and equipment, a storage medium and a product, and the method comprises the steps: carrying out the parameterization of a river channel, a road and a land parcel in a target region according to the road network density and the number density of rainwater discharge outlets in unit river channel length, and obtaining the basic parameters of a water surface rate calculation model; determining a target value of the effective service radius of the river channel according to the road average elevation and the river channel control water level; according to the target value of the effective service radius of the river channel and the length of the river channel, calculating the target value of the width of the river channel; and determining 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. Municipal drainage and water conservancy waterlogging removal can be fused, the factors such as the vertical elevation, the river channel effective service radius and the river channel control water level are considered in the water surface rate calculation process, the balance degree of river network distribution is considered, the water surface rate calculation result is more scientific and reasonable, and a scientific basis is provided for urban planning and construction and water safety management.

Description

Technical Field

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

[0002] The plain river network area is flat and low-lying. Due to the support of the tide level of the outer river, the flood water cannot be discharged to the outer river by itself. It needs to be stored in rivers and lakes and then discharged to the outer river by pump stations. Although "storage" and "discharge" are in a relationship of mutual increase and decrease, the riverbed in the plain river network area is basically flat and has poor water dynamics. Simply increasing the scale of the pump station cannot effectively solve the problem of drainage support of the rainwater pipes by the high water level of the inner river, which is particularly significant when encountering short-duration heavy rainfall. Therefore, urban waterlogging prevention and control in the plain river network area is extremely dependent on an appropriate storage water surface rate.

[0003] Although the Urban Water System Planning Code proposes an appropriate water surface ratio range based on my country's geographical and hydrological characteristics, due to differences in statistical caliber and water system functions, the water surface ratios corresponding to inner rivers and lakes that truly have the function of preventing and controlling urban waterlogging still lack normative guidance. In addition, urban waterlogging prevention and control involves two aspects: municipal drainage and water conservancy drainage. Currently, the water surface ratio is mainly calculated based on water conservancy drainage, without involving relevant factors of municipal drainage. Therefore, the calculated water surface ratio results have deviations or distortions in practical applications. Summary of the invention

[0004] The present invention provides a method, device, equipment, storage medium and product for determining urban water surface rate. The basic parameters of the water surface rate calculation model are determined in combination with municipal drainage and water conservancy drainage. The difference between the vertical elevation and the controlled water level is used as a constraint condition to calculate the effective service radius of the river channel, and then the river channel width is calculated to determine the urban water surface rate.

[0005] In order to achieve the above object, an embodiment of the present invention provides a method for determining an urban water surface rate, comprising:

[0006] 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;

[0007] 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;

[0008] 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;

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

[0010] As an improvement of the above scheme, the river, road and land in the target area are parameterized 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, including:

[0011] Obtaining the land use planning vector map and drainage engineering planning map in the target area;

[0012] According to the land use planning vector map, obtaining the road network density and comprehensive runoff coefficient in the target area;

[0013] According to the drainage project planning map, obtaining the number density of rainwater discharge outlets per unit river length in 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, the rivers, roads and plots in the target area are parameterized to obtain the basic parameters of the water surface rate calculation model.

[0015] As an improvement of the above solution, the target value of the effective service radius of the river is determined according to the average elevation of the road and the controlled water level of the river, including:

[0016] 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;

[0017] 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;

[0018] 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.

[0019] As an improvement of the above solution, the target value of the river channel width is calculated according to the target value of the effective service radius of the river channel and the length of the river channel, including:

[0020] Calculating the inflow flow of the river channel according to the target value of the effective service radius of the river channel;

[0021] Determine the required storage capacity of the river according to the inflow flow of the river and the flow of the drainage pump station;

[0022] 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.

[0023] As an improvement of the above solution, the calculation of the river inflow flow 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, the rainwater pipe catchment area is determined, and the outflow of the rainwater pipe outlet is simulated by using the SWMM model;

[0025] The inflow flow of the river is obtained according to the outflow flow of the stormwater pipe discharge outlet.

[0026] As an improvement of the above solution, the calculation of the pipeline head loss corresponding to the waterlogging prevention and control return period according to the initial value includes:

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

[0028] 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;

[0029] 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.

[0030] In order to achieve the above object, an embodiment of the present invention provides a device for determining a water surface rate in an urban area, comprising:

[0031] 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;

[0032] 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;

[0033] 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;

[0034] The water surface rate determination module is used to 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 river channel effective service radius.

[0035] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a corresponding urban water surface ratio determination device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the above-mentioned urban water surface ratio determination method when executing the computer program.

[0036] In order to achieve the above-mentioned purpose, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned urban water surface rate determination method.

[0037] To achieve the above objectives, 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 method for determining the urban water surface ratio.

[0038] Compared with the prior art, the method, device, equipment, storage medium and product for determining the urban water surface rate disclosed in the embodiment of the present invention parameterize the river, road and plot 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 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 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 river network distribution, so that the water surface rate calculation result is more scientific and reasonable, improves the level of water safety resilience, and provides a scientific basis for urban planning and construction and water safety management. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that the terms "comprises" and "specifically" and any variations of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0044] See also Figure 1 , Figure 1 : is a flow chart of a method for determining a city water surface rate provided by an embodiment of the present invention, the method for determining a city water surface rate comprising:

[0045] S1, 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; wherein the basic parameters include: river length, river width and river effective service radius;

[0046] S2, determining a 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;

[0047] S3, 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;

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

[0049] For example, the target water surface rate Among them, R f is the effective service radius of the river, and B is the width of the river.

[0050] Specifically, the step S1 includes:

[0051] S11, obtaining a land use planning vector map and a drainage engineering planning map within the target area;

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

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

[0054] S14, parameterizing the rivers, roads and plots 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 to obtain basic parameters of the water surface rate calculation model.

[0055] Exemplarily, a land use planning map vector diagram and a drainage engineering planning map in the target area are obtained from an urban planning database. The distribution of the road network, water network, and land parcels in the target area is determined based on the land use planning map vector diagram. The road network density is calculated based on the road network. The comprehensive runoff coefficient is determined based on the topography, watershed characteristic factors, average slope, surface vegetation conditions, and soil characteristics of the land parcels. The distribution of the drainage network in the target area is determined based on the drainage engineering planning map. The number density of rainwater discharge outlets per unit river length is obtained based on the drainage network. The number density of rainwater discharge outlets per unit river length is Where N is the total number of rainwater outlets in the drainage network, L z The total length of the river. According to the road network density, the comprehensive runoff coefficient 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. For example, the river length L is set to 1 km, the river width B (in meters), and the effective service radius R of the river f (unit: m), then the total length of the road is L D =2×R f ×L×γ, where γ is the road network density; the length of a single road perpendicular to the river is L d =2×R f , the number of single roads perpendicular to the river Length of a single road parallel to the river L p Equal to the length of the river L, the number of single roads along the river The spatial structure of the road network and the river is constructed according to the principle of equal spacing between roads of the same type, where the spacing between roads perpendicular to the river is Distance between roads parallel to the river The runoff coefficient of the land surrounded by the roads is equal to the comprehensive runoff coefficient ψ. The rainwater pipes are laid along the roads, and the main pipes are the rainwater pipes laid along the roads perpendicular to the river.

[0056] Specifically, the step S2 includes:

[0057] S21, setting an initial value of the effective service radius of the river channel; and calculating the pipe head loss corresponding to the waterlogging prevention and control recurrence period according to the initial value;

[0058] S22, 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;

[0059] S23, calculating the incremental pipeline head loss according to the incremental value of the effective service radius of the river channel, until the elevation difference is equal to the incremental pipeline head loss, thereby obtaining the target value of the effective service radius of the river channel.

[0060] More specifically, the calculating, based on the initial value, the pipeline head loss corresponding to the waterlogging prevention and control return period includes:

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

[0062] 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;

[0063] 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.

[0064] It is worth noting that under the conditions of the recurrence period of urban flood control, rainwater pipes in plain river network areas are all submerged and outflows are all flooded. When the absence of overflow in rainwater inspection wells is regarded as the goal of urban flood control, the difference between the average elevation of the road and the controlled water level of the river is equal to the pipe head loss.

[0065] For example, given the effective service radius R of the river channel f It is the basic parameter of the catchment area F of the stormwater pipe, and the effective service radius R of the river is solved by iteration. f , the specific steps are as follows:

[0066] We can first assume that the effective service radius of the river is R f The initial value of is 100m (or 50m, 200m, etc.), and the cross-sectional area A of the rainwater pipe is calculated according to the initial value. The hydraulic gradient I of the rainwater pipe corresponding to the return period of waterlogging prevention and control is calculated according to the cross-sectional area A of the rainwater pipe; and the pipe head loss G corresponding to the return period of waterlogging prevention and control is calculated according to the hydraulic gradient I of the rainwater pipe and the initial value 100m. 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 average elevation of the road is H g and river control water level H s The elevation difference is greater than the pipeline head loss G f (H g -H s >G f ), then the effective service radius of the river R f Increase by a certain length (such as 20m) and repeat the calculation until H g -H s With G f When they are approximately equal, the effective service radius R of the river is obtained. f target value.

[0067] Furthermore, the cross-sectional area of ​​the stormwater pipe Among them, Q gThe design flow rate of the rainwater pipe corresponding to the design rainfall return period. According to the "Outdoor Drainage Design Standard" (GB 50014-2021), the size of the rainwater pipe is calculated according to the design rainfall return period. Generally, P = 2 years, 3 years, 5 years or 10 years. The design flow rate of the rainwater pipe corresponding to the design rainfall return period is q is the rainstorm intensity corresponding to the design rainfall return period, ψ is the comprehensive runoff coefficient, F is the catchment area of ​​the rainwater pipe, v is the flow velocity of the rainwater pipe. In order to effectively deal with high-standard rainfall (such as once in 50 years or once in 100 years) for waterlogging prevention and control, the cross-sectional area of ​​the pipe should be high. Therefore, the designed flow velocity of the rainwater pipe is the minimum value of 0.75m / s.

[0068] Further, according to the flow formula Q n =A×v and flow rate formula Derivation of hydraulic gradient of stormwater pipes corresponding to the return period of waterlogging prevention and control Where n is the roughness coefficient of the stormwater pipe, Q n is the rainwater design flow corresponding to the recurrence period of waterlogging prevention and control, and R is the hydraulic radius of the rainwater pipe.

[0069] Specifically, the step S3 includes:

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

[0071] S32, determining the required storage capacity of the river channel according to the inflow flow of the river channel and the flow of the drainage pump station;

[0072] S33, calculating a target value of the width of the river channel according to the required storage capacity of the river channel and the length of the river channel.

[0073] More specifically, the step S31 includes:

[0074] S311, determining the catchment area of ​​the rainwater pipe according to the target value of the effective service radius of the river channel, and simulating the outflow of the rainwater pipe outlet by using the SWMM model;

[0075] S312, obtaining the inflow flow of the river according to the outflow flow of the rainwater pipe discharge outlet.

[0076] Exemplarily, according to the effective service radius R of the river f The target value is used to determine the rainwater drainage zone, and the outflow of the rainwater drainage outlet is simulated by SWMM model. The outflow of all rainwater drainage outlets at the same time is accumulated as the river inflow Q under the recurrence period of waterlogging prevention and control. The river inflow Q is compared with the drainage pump station flow Q min The equal moments are denoted as t m ,tm+τ , then, t m to m+τ The closed area formed by the curve of the river inflow flow and the curve of the drainage pump station flow in the time period is the river storage volume V. m to m+τ The time period is divided into several equal time periods Δt, and the required storage capacity of the river channel Among them, Q m t m The inflow of the river at that moment, Q m+Δt t m+Δt The inflow of the river at that moment, Q m+2Δt t m+2Δt The inflow of the river at that moment, Q m+τ-Δt t m+τ-Δt The inflow of the river at that moment, Q m+τ t m+τ The inflow of the river at the moment, Δt is the calculation period, and τ is the time t m To time t m+τ The time period between the two; the river channel is generalized into a rectangle, and the river channel width Among them, H s is the controlled water level of the river; H0 is the normal water level of the river, H0 is the average water level of the outer river, and L is the length of the river.

[0077] Furthermore, the flow of drainage pump stations under the recurrence period of waterlogging prevention and control Among them, ψ is the comprehensive runoff coefficient; S is the river catchment area, H T is the designed rainfall amount; T is the designed rainfall duration for drainage, which is generally 24h.

[0078] It is worth noting that the embodiment of the present invention takes the mechanism of waterlogging in plain river network areas as the starting point, integrates the two professions of municipal drainage and water conservancy drainage, and 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. The difference between the vertical elevation and the controlled water level is used as a constraint condition, and an iterative method is used to calculate the effective service radius of the river channel, and the river inflow flow is further calculated. The river storage capacity and river width required for the river channel under the standard conditions of the recurrence period of waterlogging prevention and control are calculated with the minimum scale of the pump station as a constraint condition, and the water surface rate is calculated.

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

[0080] S5: Perform water safety planning for the target area according to the target water surface rate.

[0081] For example, the target water surface ratio is applied to urban water system planning, drainage and flood prevention planning, flood control and drainage planning, and waterlogging control. For example, the target water surface ratio is compared with the current water surface ratio of the drainage zone to calculate the water surface ratio gap, so as to formulate more scientific measures to make up for the shortcomings of water storage space and improve the resilience level of urban water security; the target water surface ratio is applied to the delineation of urban development boundaries, for example, according to the calculation method of the target water surface ratio, the construction land scale and development boundary that the current river and lake water area can carry are calculated, so as to better support the construction and development of the city.

[0082] A method for determining a city's water surface rate is disclosed in an embodiment of the present invention. The method parameterizes rivers, roads, and plots in a target area according to the road network density and the density of the number of rainwater outlets per unit river length, so as to obtain basic parameters of a water surface rate calculation model. The basic parameters include: river length, river width, and effective river service radius. The target value of the effective river service radius 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 river service radius and the river length. The target water surface rate of the target area is determined according to the target value of the river width and the target value of the effective river service radius. It can integrate municipal drainage and water conservancy drainage. The water surface rate 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 station, while taking into account the balance of river network distribution. The river inflow flow is calculated based on the outflow flow of the drainage pipe, which is more in line with the rainwater confluence process, making the water surface rate calculation results more scientific and reasonable, improving the level of water safety resilience, and providing a scientific basis for urban planning and construction as well as water safety management.

[0083] See also Figure 2 , Figure 2 1 is a schematic diagram of the structure of a device 10 for determining a city water surface rate provided by an embodiment of the present invention. The device 10 for determining a city water surface rate comprises:

[0084] The basic parameter conversion module 11 is used to parameterize the river, road and land 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;

[0085] A target value determination module 12 is used to determine a 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;

[0086] A target value calculation module 13, used to calculate a target value of the river channel width according to a target value of the river channel effective service radius and the river channel length;

[0087] The water surface rate determination module 14 is used to 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 river channel effective service radius.

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

[0089] Obtaining the land use planning vector map and drainage engineering planning map in the target area;

[0090] According to the land use planning vector map, obtaining the road network density and comprehensive runoff coefficient in the target area;

[0091] According to the drainage project planning map, obtaining the number density of rainwater discharge outlets per unit river length in the target area;

[0092] 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.

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

[0094] 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;

[0095] 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;

[0096] 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.

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

[0098] Calculating the inflow flow of the river channel according to the target value of the effective service radius of the river channel;

[0099] Determine the required storage capacity of the river according to the inflow flow of the river and the flow of the drainage pump station;

[0100] 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.

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

[0102] 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;

[0103] The inflow flow of the river is obtained according to the outflow flow of the stormwater pipe discharge outlet.

[0104] More specifically, the calculating, based on the initial value, the pipeline head loss corresponding to the waterlogging prevention and control return period includes:

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

[0106] 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;

[0107] 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.

[0108] Furthermore, the urban water surface rate determining device 10 further includes:

[0109] The water surface rate application module is used to carry out water safety planning for the target area according to the target water surface rate.

[0110] An urban water surface ratio determination device 10 provided in an embodiment of the present invention can implement all processes of the urban water surface ratio determination method of the above-mentioned embodiment. The functions of each module in the device and the technical effects achieved are respectively the same as the functions and technical effects achieved by the urban water surface ratio determination method of the above-mentioned embodiment, and will not be repeated here.

[0111] See also Figure 3 , Figure 3 1 is a schematic diagram of the structure of a device 20 for determining a city water surface rate provided in an embodiment of the present invention. The device 20 for determining a city water surface rate 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 above-mentioned method for determining a city water surface rate are implemented. Alternatively, when the processor 21 executes the computer program, the functions of each module in the above-mentioned device for determining a city water surface rate are implemented.

[0112] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the urban water surface rate 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 PDA, and 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 may 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. The urban water surface ratio determination device 20 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the urban water surface ratio determination device 20 may also include input and output devices, network access devices, buses, etc.

[0114] The processor 21 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 21 is the control center of the urban water surface rate determination device 20, and uses various interfaces and lines to connect various parts of the entire urban water surface rate determination device 20.

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

[0116] Wherein, if the module integrated in the urban water surface rate determination device 20 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. 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-mentioned method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained 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, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0117] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0118] An embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the urban water surface rate determination method as described in the above embodiment.

[0119] In addition, 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 urban water surface ratio determination method of the above embodiment.

[0120] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection 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; The target water surface rate of the target area is determined according to the target value of the river channel width and the target value of the river channel effective service radius.

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: 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.

4. 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 river inflow according to the target value of the effective service radius of the river; Determine the required storage capacity of the river channel based on the inflow flow of the river channel 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.

5. The method for determining the urban water surface rate according to claim 4, 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.

6. The method for determining the urban water surface rate according to claim 3, 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.

7. 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; The water surface rate determination module is used to 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 river channel effective service radius.

8. 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 6 is implemented.

9. 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 6.

10. 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 1-6.

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