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| Effects of upslope runoff on detachment and transport processes on loessial hillslopes |
| Wang Xiaoyong1,2,Zheng Fenli1,2,Zhang Xinhe3 |
| 1.College of Resources and Environmental Sciences,Northwest A & F University, 712100,Yangling,Shaanxi;2.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,712100,Yangling,Shaanxi;3.Guangdong Institute of Water Resources and Hydropower Research,510610,Guangzhou: China |
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Abstract Research on upslope runoff effects on downslope detachment and transport process may deepen the understanding of hillslope soil erosion process and mechnisems.An experimental system,consisted of water feeding installation and the tested box,was used to study upslope runoff effects on detachment and transport processes on loessial 15° hillslope under different rainfall intensities by using rainfall simulator.The results showed that the total sediment delivery with upslope runoff input was greater than that without upslope runoff input at 50,75,and 100 mm/h of rainfall intensities,i.e.,upslope runoff discharging into downslope caused additional sediment delivery(net sediment delivery).Sediment delivery was not a simply positive correlation with upslope runoff rate.Additional sediment delivery was small when low upslope runoff discharged into downslope.When increasing upslope runoff rate reached to 1.6 L/min,sediment delivery was remarkably increased with an increase of upslope runoff rate,and the increment range of sediment delivery increased with the increase of upslope runoff rate.But when increasing upslope runoff rate was greater than 3.2 L/min,the increment range of sediment delivery decreased with the increase of upslope runoff rate.After upslope runoff discharged into downslope section,sediment regime at downslope section was a domination of detachment-transport
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Received: 16 July 2008
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