Urban time-varying gain rainfall-runoff process simulation calculation method

Abstract

The invention discloses an urban time-varying gain rainfall-runoff process simulation calculation method, which comprises the following steps of preparing basic data including rainfall data, urban underlying surface space distribution, urban area planning and the like; dividing urban calculation units, dividing calculation areas into lakes, catchment areas and wetlands according to types of underlying surfaces of cities, and further dividing the catchment areas into six subclasses including common permeable surfaces, impermeable surfaces, roads, depression, small lakes and low-impact development measures; carrying out runoff calculation: taking rainfall as model input, and respectively calculating runoff of each calculation unit; and carrying out confluence calculation: according to the runoff production calculation result, obtaining the total flow of the region through earth surface confluence and pipe network confluence calculation. According to the method, the complex underlying surface condition of a city can be comprehensively considered, the urban runoff and runoff process can be accurately simulated through the urban time-varying gain nonlinear runoff and runoff production principle, and the method has great significance in urban inland inundation risk assessment and early warning and forecasting.

Description

technical field [0001] The invention relates to the field of urban water cycle and runoff calculation, in particular to an urban time-varying gain rainfall-runoff process simulation calculation method. Background technique [0002] The urban storm runoff process is also one of the important causes of urban water problems such as urban waterlogging, water pollution, and soil erosion. It is also an important content for further research on the hydrological effects of urbanization and urban stormwater characteristics. Scholars at home and abroad have carried out a lot of research work on the process of runoff production and confluence in urban rainfall runoff, and proposed a series of calculation and simulation methods that can be used for urban runoff production. At present, the runoff calculation methods commonly used at home and abroad can be divided into statistical analysis methods, infiltration curve methods and model methods. Among them, the SCS method, the Green-Ampt i...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method that comprehensively considers the complex underlying surface conditions of cities such as lakes, depressions, impermeable surfaces, roads, etc., based on the non-linear Runoff mechanism, time-varying gain rainfall-runoff process simulation calculation method for accurately simulating the runoff process in urban areas

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