| Experimental study on runoff dynamic processes on loess hillslope |
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| DOI：10.7606/j.issn.1000-7601.2010.05.41 |
| Key Words: Loess slope sheet flow runoff rainfall intensity slope gradient slope length |
| Author Name | Affiliation | | LIU June | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG ZhanLi | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | YUAN Yin | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Kuandi | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | GAO Sujuan | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | CHEN Hao | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The runoff process of the sheet flow is the basic hydrologic process on the hillslope, and to reveal the mechanism of the runoff of the sheet flow is important for the understanding of the runoff theory on hillslope. With artificial simulat
ion rainfall tests, runoff processes of the sheet flow on loess hillslope were studied and the following results were obtained: (1) The runoff rates varied with rainfall duration and their relationship could be described with power function
. Runoff increased while rainfall duration increased, and the change was large in the first 2～10 minutes; after 10 minutes it trended to steady. (2) Under different slope gradients, runoff depth on the slope increased with rainfall intensi
ties linearly, and the relationship could be described by linear equation. (3) Under different rainfall intensities, runoff depth on the slope varied similarly with soil gradients and could be described by log-linear equation. (4) Under different rainfall intensities, the relationship of the runoff depth and slope length could be described with reciprocal-linear equation. (5) The runoff depth statistical equations could be described by multiple linear equations, and rainfall intensity affected erosion modulus most greatly, followed by slope gradient and slope length. |
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