Effect of Soil-water Characteristic Curve on Runoff in Sponge City Construction
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
9 9
Page:
117
Column:
Date of publication:
2020-05-01
- Keywords:
- font-size: 10pt; ">runoff; soil- font-size: 10pt; ">water characteristic curve; unsaturated permeability; Green-Ampt model; sponge city
- Abstract:
-
The soil- water characteristic curve of soil is an important parameter in the source control stage of sponge city construction, and it is the theoretical basis for the study of rainfall infiltration and runoff. According to the actual situation of sponge city construction of Zhuanghe (a pilot sponge city), the soilwater characteristic curves of three local soils were determined, and the soil matrix suction and unsaturated permeability equation were obtained by fitting calculation. Then, the rainfall infiltration and runoff under different rainfall intensities were calculated by using the Green-Ampt improved model. The order of soil infiltration capacity was as follows: manual backfill soil > bare slope soil > tillage soil, and the infiltration rate of the manual backfill soil was about 1.1-4.4 times that of the other soils. During a heavy rain, the delayed runoff time of the manual backfill soil was 1.9-5.8 times that of the other soils. In the case of an extremely heavy rain, all the three kinds of soil would produce excess runoff in a short time, which had no obvious effect on delaying flood peak time and controlling flood peak flow.
Last Update:
2020-05-01