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Two-dimensional numerical simulation method of urban surface runoff

A surface runoff and simulation method technology, applied in 3D modeling, image data processing, electrical digital data processing, etc., can solve problems such as the impact of urban flood process simulation accuracy, and achieve the effect of ensuring water quantity and quality conservation characteristics and improving accuracy

Active Publication Date: 2019-03-29
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

At present, there is no urban flood model that considers the difference in the confluence process between urban buildings and ordinary urban ground, which will inevitably affect the simulation accuracy of urban flood processes

Method used

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  • Two-dimensional numerical simulation method of urban surface runoff
  • Two-dimensional numerical simulation method of urban surface runoff
  • Two-dimensional numerical simulation method of urban surface runoff

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Embodiment Construction

[0034] Attached below figure 1 And attached figure 2 The present invention is described in further detail.

[0035] The invention is a two-dimensional numerical simulation method of urban surface runoff considering the characteristics of building confluence, and fully considers the difference and connection between building confluence and ordinary ground confluence in urban areas (that is, the rainfall runoff process on the top of a building generally flows through a rainwater pipe. After going to the ground around the building, and then participating in the process of urban surface confluence) to carry out more accurate numerical process simulation of urban surface runoff. The method mainly includes the following steps:

[0036] (1) Obtain detailed topographical data of the urban area and geomorphic geometric feature data of buildings (including rainwater pipe data), streets, etc., with a scale of 1:2000 or more (including 1:2000).

[0037] (2) Discretization of the calcu...

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Abstract

The invention provides a two-dimensional numerical simulation method of urban surface runoff. After obtaining urban topography and geomorphology data, the triangular unstructured mesh is used to discrete the computational area of the urban area. The area where the building is located does not participate in dissection, and its contour line is used as the control line of mesh dissection. Each rainwater pipe of the building is connected with the ground through the confluence connecting edge. Firstly the method calculates the confluence area of each rainwater pipe, and then calculates the discharge process of each rainwater pipe. Two-dimensional Godunov model is used to simulate the rainwater outflow process. The rainfall in the surface grid element is treated as the source term in the model,and the rainwater outflow process is regarded as the flow boundary condition of the element corresponding to the connecting edge. The invention fully considers the characteristics of building confluence in the urban area, which can not only ensure the mass conservation characteristic of the whole urban area during flood calculation, but also consider the influence of the water flow momentum at the outlet of the rain pipe on the surface runoff, thus overcoming the shortcoming that the existing urban flood and waterlogging model can not consider the building confluence process, and improving the calculation accuracy.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a two-dimensional numerical simulation method for urban surface runoff considering the confluence characteristics of buildings. Background technique [0002] In recent years, urban rainstorm and flood disasters have become a normal phenomenon, which has become a major problem that interferes with the normal operation of cities and threatens urban public safety. In the research work of urban flood problems, the urban flood model has become an important scientific tool to solve urban planning, urban flood early warning and other fields. [0003] Currently, there are roughly three models for simulating urban flood processes: hydrological model, simplified model, and hydrodynamic model. Compared with hydrological models and simplified models, hydrodynamic models based on physical mechanisms have better accuracy in simulating water flow movements wit...

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Application Information

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IPC IPC(8): G06F17/50G06T17/20
CPCG06F30/13G06F30/20G06T17/20Y02A10/40
Inventor 张大伟丁留谦向立云马建明张娜权锦赵雪莹张爱静贾兵营
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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