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Water resource simulation method based on SWMM and MODFLOW coupling

A simulation method and technology of water resources, applied in general water supply conservation, structured data retrieval, instruments, etc., can solve problems such as deterioration of water body ecological environment, local waterlogging, serious water pollution of rivers, etc., and achieve the effect of convenient layout and selection

Active Publication Date: 2019-03-19
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When areas with high urbanization face extreme weather, the traditional water control methods of the fast drainage model often have urban rainwater problems such as local waterlogging, serious water pollution in rivers, and deterioration of the ecological environment of water bodies.

Method used

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  • Water resource simulation method based on SWMM and MODFLOW coupling
  • Water resource simulation method based on SWMM and MODFLOW coupling
  • Water resource simulation method based on SWMM and MODFLOW coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The runoff calculation method for permeable surface, subsidence impermeable surface and non-depression impermeable surface is:

[0095] For the impermeable surface without depression storage, except for surface evaporation, the rainfall is basically converted into runoff, and runoff begins to form when the rainfall intensity is greater than the evaporation. Therefore, the formula for calculating the flow rate of impermeable surface without depression storage is:

[0096] R 1 = P-E (1)

[0097] Where: R 1 -The flow rate of the impermeable area of ​​non-sag storage, mm;

[0098] P-precipitation, mm;

[0099] E-evaporation, mm.

[0100] For the impermeable surface with depressions, the maximum depression volume of the surface should be deducted from the rainfall first, and then the runoff will start to form. Therefore, the formula for calculating the flow rate of impermeable surface with depressions is:

[0101] R 2 =P-D (2)

[0102] Where: R 2 - The production f...

Embodiment 2

[0112] The derivation method of the nonlinear reservoir model is:

[0113] The surface confluence process refers to the collection of net rain from each sub-catchment to the outlet control section or directly discharged into the reservoir or river. The simulation of surface confluence routing adopts a nonlinear reservoir model, which is solved by the continuity equation and Manning's formula simultaneously. To complete the surface flow routing, the following parameters need to be entered in the SWMM model: the surface slope of the sub-catchment, the area of ​​the sub-catchment, the width of the sub-catchment, the ratio of the permeable area of ​​the sub-catchment and various types of surface depressions Stock volume and Manning's roughness coefficient. The runoff calculation methods for the three types of underlying surfaces use the nonlinear reservoir calculation model for calculation and simulation. The schematic diagram of the calculation method for the nonlinear reservoir...

Embodiment 3

[0135] The construction method of the infiltration model is as follows:

[0136] There are three infiltration models in SWMM: the Horton model; the Green-Ampert model and the runoff curve number method. Combined with rainfall, soil type and ground conditions, etc., an infiltration model suitable for the local area is selected to simulate the local infiltration process.

[0137] The Horton model is empirically derived from observations and is only suitable for projects where rainfall intensity always exceeds infiltration capacity, and the purpose of using the modified form in SWMM is to overcome this deficiency. The Horton infiltration model can be represented by the following function:

[0138] f=(f 0 -f ∞ )e -kt + f ∞ (7)

[0139] In the formula: f is the infiltration capacity, mm / min; k is the infiltration attenuation index, s-1 or h-1; t is the rainfall time, min; f0 is the initial infiltration rate, mm / min; Rate, mm / min.

[0140] The Green-Ampter model equation is...

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Abstract

The invention belongs to the technical field of hydrological water resources, and discloses a water resource simulation method based on SWMM and MODFLOW coupling, which comprises the following steps:collecting research area space geographic data, meteorological data, rainfall-related hydrological data and hydrogeological basic data; constructing an SWMM and MODFLOW coupling model suitable for theresearch area in combination with the collected data; constructing different rainfall scenarios, and analyzing the dynamic change of the surface water under the different rainfall scenarios in combination with the SWMM model; different rainfall supply scenes are constructed in combination with an SWMM model simulation result, and underground water dynamic changes under the situation that different rainfall is not given are analyzed in combination with an MODFLOW model. According to the coupled water resource simulation method provided by the invention, the problems of local waterlogging, serious river water quality pollution, water body ecological environment deterioration and other urban rainwater in a traditional water treatment mode of a quick drainage mode in an extreme weather in a region with higher urbanization are effectively avoided, and the drainage intensity of a city is improved.

Description

technical field [0001] The invention belongs to the technical field of hydrology and water resources, in particular to a water resource simulation method based on the coupling of SWMM and MODFLOW. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: with the rapid development of economy and society, rapid urbanization, the increase of groundwater extraction in urban areas has caused serious groundwater table decline; there is also global warming, bad weather, It often occurs in urban areas, causing the city to see "sea" and other scenes, which is very easy to cause disasters. [0003] Urban rain and flood disasters are one of the most important natural disasters that threaten human survival and development. With the rapid development of urbanization, the proportion of ground hardening in urbanization is getting higher and higher, and the permeability of the ground is getting lower and lower. The function of water...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F16/29
CPCG06F30/20Y02A20/152Y02A10/40
Inventor 黄津辉黄润影
Owner NANKAI UNIV
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