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《Scientia Geographica Sinica》 2006-04
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Ephemeral Gully Development Process at Loess Steep Hillslope

ZHENG Fen-Li~(1,2),WU Min~(1,2),ZHANG Yu-Bin~(1,3),DING Jin-Li~(1,3)(1.The State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resource,Yangling,Shaanxi 712100;2.Northwest A & F University,Yangling,Shaanxi 712100;3.Graduate School of Chinese Academy of Sciences,Beijing 100049)  
According to the topographic characteristic parameters of ephemeral gully at loess steep hillslopes,the mold of ephemeral gully shape at initial stage was made to quantify the change processes of ephemeral gully headcut advance,gully-wall collapse and channel deep-cutting in three stages(the beginning,middle and late stages) of ephemeral gully development.The results showed that different stages of ephemeral gully development corresponded to different ephemeral gully erosion process.In the beginning stage of ephemeral gully development,ephemeral gully headcut,gully-wall collapse and channel deep-cutting were very active,the speed of ephemeral headcut advance was much higher than the speeds of gully-wall expansion and channel deep-cutting.In the middle stage, gully-wall collapse and channel deep-cutting were dominant.In the late stage,gully-wall collapse was dominant,but the speed of gully-wall expansion was lower than that in middle stage.In the beginning and middle stages of ephemeral gully development,ephemeral gully erosion accounted for 58.4% of the total sediment yield in ephemeral gully catchment;in the late stage,ephemeral gully erosion took up 26%-594% of the total sediment yield.
【Fund】: 国家自然科学基金重点项目(40335050);; 中国科学院知识创新重要方向项目(KZCX3-SW-422)资助
【CateGory Index】: S157
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