Sponge city hydrologic calculation method

Abstract

The invention relates to the field of hydrologic calculations, and more specifically, to a sponge city hydrologic calculation method. The method includes the steps of S1, collecting rainfall-related basic data within a set time limit of a study region; S2, combined with the collected data, constructing a SWMM model suitable for the study region; S3, constructing different rainfall scenarios, combined with the SWMM drainage model, analyzing response characteristics of a drainage system in the region before and after the regulation and control via LID measures under the different rainfall scenarios, and comparing regulation and control effects of the LID measures; and S4, establishing a regional rainfall flood characteristic assessment system to explore spatial and temporal characteristics of a rainfall flood before and after the regulation and control via the LID measures under the different rainfall scenarios. The invention provides the sponge city hydrologic calculation method, whichconstructs the regional drainage model, simulates the peak runoff, drainage pipe network drainage pressure, water accumulation time and water accumulation amount in a sub catchment region before and after the regulation and control via the LID measures in the region under various extreme rainfall scenarios, is conducive to grasping the regulation and control effects of the LID measures on the regional rainfall flood and facilitates the setting of the LID measures in the construction of sponge cities.

Description

technical field [0001] The invention relates to the field of hydrological calculations, and more particularly, to a hydrological calculation method for a sponge city. Background technique [0002] 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 hardening ratio of the underlying surface is getting higher and higher, and the permeability of the ground is getting lower and lower. function of water. Sponge city is the only way to achieve sustainable urban development, and it is also an inevitable choice to build a harmonious city, people and water. 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. At present, domestic rese...

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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.

At present, domestic research on rainstorm and flood disaster risk assessment mainly focuses on large-scale (country, river basin, province), static qualitative or semi-quantitative research, while qualitative and quantitative research on small and medium scale (urban areas, communities) under different rainfall scenarios Fewer, and this category mainly focuses on the general scope of property damage and inundation, and less involves the diagnosis of urban or community drainage pipe network systems and the identification of drainage black spots

On the other hand, as the disadvantages of the "quick discharge" stormwater approach become increasingly prominent, there are few studies on the response mechanism of stormwater control measures under different rainfall scenarios, and there is a lack of dynamic, qualitative and quantitative analysis of stormwater control measures. analyze

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