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Open AccessArticle

Study on Runoff and Infiltration for Expansive Soil Slopes in Simulated Rainfall

1
College of Civil Engineering and Architecture, Guangxi University, Nanning 530000, China
2
College of Architecture Engineering, Hezhou University, Hezhou 542600, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(1), 222; https://doi.org/10.3390/w12010222
Received: 25 November 2019 / Revised: 22 December 2019 / Accepted: 8 January 2020 / Published: 13 January 2020
(This article belongs to the Section Hydrology)
In order to understand the hydrological process of expansive soil slopes, simulated rainfall experiments were conducted to study the effects of slope gradient and initial soil moisture content on runoff and infiltration for expansive soil slopes located in south China. The field program consisted of four neighboring slopes (70%, 47%, 32%, and 21%) instrumented by a runoff collection system and moisture content sensors (EC-5). Results from the monitored tests indicate that there was delay in the response of surface runoff. The runoff initiation time decreased with initial soil water content and increasing slope gradient. After the generation of runoff, the cumulative runoff per unit area and the runoff rate increased linearly and logarithmically with time, respectively. The greater the initial soil moisture content was, the smaller the influence of slope gradient on runoff. A rainfall may contribute from 39% to about 100% of its total rainfall as infiltration, indicating that infiltration remained an important component of the rainwater falling on the slope, despite the high initial soil water content. The larger the initial sealing degree of slope surface was the smaller the cumulative infiltration per unit area of the slope. However, the soil moisture reaction was more obvious. The influence of inclination is no longer discernible at high initial moisture levels. The greater the initial soil moisture content and the smaller the slope gradient, the weaker was the change of soil water content caused by simulated rainfall. The influence of initial soil moisture content and slope gradient on the processes of flow and changes of soil water content identified in this study may be helpful in the surface water control for expansive soil slopes.
Keywords: run off; infiltration; expansive soil slopes; slope gradient; initial soil moisture content run off; infiltration; expansive soil slopes; slope gradient; initial soil moisture content
MDPI and ACS Style

Lei, W.; Dong, H.; Chen, P.; Lv, H.; Fan, L.; Mei, G. Study on Runoff and Infiltration for Expansive Soil Slopes in Simulated Rainfall. Water 2020, 12, 222.

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