Analysis of Surface Runoff in Zhengzhou City Under Extreme Rainfall Conditions
To analyzing surface runoff under different extreme rainfall events,different land use types and different slopes in Zhengzhou City,based on the extreme rainfall events on August 7,2020,July 20,2021 and July 22,2022,the land use types from 2000 to 2020 and the same rainfall scenarios,the characteristics of surface runoff in the study area were analyzed using the SCS-CN model.The results show that in the three extreme rainfall events,the surface runoff in the main urban area was relatively large.Under the influence of impervious surface,the surface runoff of the main urban area is still greater than that of the surrounding area when the rainfall of the main urban area is less than that of the sur-rounding urban area.In terms of terrain slope,the average surface runoff in the micro-slope(<5°)area is the largest,and the overall trend is that the larger the slope,the smaller the average surface runoff.Under the same rainfall condi-tions,the average surface runoff in Zhengzhou City from 2000 to 2020 showed a gradual increase trend,and the average surface runoff in the main urban area increased significantly.With the increase of rainfall,the surface runoff of Zhengzhou City increased significantly,and the surface runoff of the main urban area increased faster than that of the surrounding ur-ban area.Under the extreme rainfall conditions,the surface runoff in the main urban area and the micro-slope area of Zhengzhou City is generally relatively large.So,it is necessary to rationally adjust land use and increase the ratio of forest and grass coverage.
Zhengzhou CitySCS-CN modelextreme rainfall eventsland use typesurface runoff
万方数据
维普
