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| Response of runoffinduced sediment discharge to hydrodynamic parameters of rill on loess hillslope |
| Tan Zhenxue1,2，Wang Zhanli1,3, Liu Jun’e4, Yuan Yin4, Chen Hao4, Wang Sha4, Shen Nan4, Jiao Nian4 |
| 1.State Key Laboratory of Soil Erosion and Dryland Farming in the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100,Yangling, Shaanxi; 2.Qinzhou Soil and Water Conservation Monitoring Station, 535000,Qinzhou, Guangxi; 3.Institute of Soil and Water Conservation, Northwest A&F University, 712100, Yangling, Shaanxi; 4.School of Resources and Environment, Northwest A&F University, 712100,Yangling, Shaanxi：China |
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Abstract Runoffinduced sediment discharge is one of the most important process of erosion and sediment yield. It is important to clarify the relationships of runoffinduced sediment discharge and hydrodynamic parameters of rill flow on loess hillslope. In this paper, the relationships were studied by experiment of simulated rainfall and constant flow using group plots. Results showed that: 1) In single rainfallrunoff event, the response of sediment transport modulus to mean hydrodynamic parameters was given as follows: mean unit energy (R=0.99)>mean stream power (R=0.88)>mean stream shear stress (R=0.82)>mean unit stream power (R=0.76). 2) During the rainfallrunoff process, the response of the sediment transport rate to stream shear stress (R=0.88) was greater than stream power (R=0.47)，and the correlations of sediment transport rate with unit energy and with unit stream power were weak. The relationship of stream shear stress and the sediment transport rate could be expressed by power functions.
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Received: 04 May 2011
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