SWMM modeling-oriented and multi-element-considered method for automatically dividing sub-basins of city regions

Abstract

The invention relates to an SWMM modeling-oriented and multi-element-considered method for automatically dividing sub-basins of city regions. The method comprises the following steps of: S1, carrying out sub-basin automatic modeling on a to-be-divided region by using DEM data, basic geographic data, land utilization/coverage data and rainwater pipe network data of the to-be-divided region; S2, following the terrains to obtain a river network water outlet sub-basin; S3, obtaining a river network water outlet sub-basin division unit; S4, carrying out division to obtain rainwater well sub-basins; S5, combining the rainwater well sub-basins obtained by the river network water outlet sub-basin division unit and then carrying out topological check and local correction to obtain final geometrical morphologies of sub-basins of the to-be-divided region; and S6, setting attribute information of the sub-basins of the to-be-divided region and carrying out SWMM modeling-oriented automatic calculation on the attribute information of the sub-basins. According to the method provided by the invention, the influences caused by multiple elements such as terrains, river systems, roads, artificial building facilities and rainwater pipe networks to the city surface rainwater conflux are considered, so that the automatic division of sub-basins in the city regions is realized.

Description

technical field [0001] The invention relates to the field of information, in particular to a method for automatically dividing sub-watersheds of urban areas in consideration of SWMM modeling and multi-factors. Background technique [0002] Urban waterlogging disaster, because it threatens the safety of human life and property and seriously affects the sustainable development of society and economy, has become a hot issue of widespread concern all over the world. As a dynamic precipitation-runoff simulation model, SWMM (Storm Water Management Model) can be used to simulate a single precipitation event or long-term water quantity and water quality in a city. Prevention and mitigation of urban flooding. In the simulation of urban hydrological processes, due to the impact of human activities, urban areas inevitably face greater challenges than natural watersheds, including higher requirements for input data, more complex simulation of catchment networks, and surface and groundw...

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a method for automatic division of sub-watersheds in urban areas oriented to SWMM modeling and taking into account multiple elements, aiming to solve the problems of low efficiency of manual sub-basin division and low accuracy of automatic divi

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