| Experimental modelling of runoff dynamic processes on loess hillslope |
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| DOI：10.7606/j.issn.1000-7601.2007.06.25 |
| Key Words: loess hillslope runoff dynamic variation processes experimental modelling |
| Author Name | Affiliation | | MA Chun-yan | The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A＆F University,Yangling,Shaanxi 712100,China | | WANG Zhan-li | The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A＆F University,Yangling,Shaanxi 712100,China；The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Science and Ministry of Water Resources,Yangling,Shaanxi 712100,China | | TAN Zhen-xue | ．The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Science and Ministry of Water Resources,Yangling,Shaanxi 712100,China |
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| Abstract: |
| Based on simulated rainfall experiment,the processes of runoff dynamic variation on the loess hillslope was studied and the following results were obtained.(1) Slope runoff intensity varied with rainfall time and it could be described with logarithmic equation.Runoff intensity changed greatly between 5～10 min after rainfall began, then it changed slowly and tended to be steady;(2) Effect of rainfall intensity on slope runoff depth could be described with linear equations.Runoff depth rapidly increased with increase of rainfall intensity;(3) Effect of slope gradient on slope runoff depth could be described with parabola equations.The critical slope gradient was about 25°;(4) Effect of slope length on slope runoff depth could be described with logarithmic equations.With increase of rainfall intensities,slope runoff depth significantly increased under slope length;(5) The integrated impact of the three factors on slope runoff depth could be described with a power equation.The result showed effect of rainfall intensity on slope runoff depth was more important than slope length and slope gradient. |
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