Research on runoff erosion and sediment yield laws of typical watershed under single rainfall on Loess Plateau

【Objective】 To study the laws of soil erosion and sediment yield under single rainfall runoff in small watershed on Loess Plateau,the soil erosion and sediment yield prediction model adapted to this region was established.【Method】 Adopted runoff erosion power model and topographical fractal information dimension model on basis of observed data of runoff and sediment in Chabagou watershed for 32 years,the sediment yield laws under single rainfall runoff was analyzed through applying multielement nonlinear regression method.【Result】 The result showed that there was close relation between sediment yield modulus Ms and runoff erosion power E,topographical fractal information dimension Di,the model had good precision and definite applicability.【Conclusion】 Based on runoff erosion power,geomorphological features and topographical fractal information dimension,the forecast model for runoff erosion in Chabagou watershed under single rainfall can roughly reflect the characteristics and its relationship with water and sediment power.This research will provide theoretical basis to establish watershed runoff erosion and sediment yield predictive model which had comprehensive applicability and preferable prediction precision on Loess Plateau.