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[1]YAN Dong-chun,WEN An-bang,SHI Zhong-lin,et al.Critical Slope Length and Control of Rill Occurrence on Cultivated Land of Purple Soil in Sichuan Basin[J].Research of Soil and Water Conservation,2010,17(06):1-4.

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Critical Slope Length and Control of Rill Occurrence on Cultivated Land of Purple Soil in Sichuan Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 06 Page number: 1-4 Column: Public date: 2010-12-20

Title:: Critical Slope Length and Control of Rill Occurrence on Cultivated Land of Purple Soil in Sichuan Basin

Author(s):: YAN Dong-chun^1,2, WEN An-bang¹, SHI Zhong-lin^1,2, SU Ming^1,2, HE Xiu-bin¹; 1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. Graduate Univercity of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: rill; critical slope length; purple soil; cultivated land

CLC:: S157.1

DOI:: -

Abstract:: Rill erosion is one of the main formats in slope erosion, of which is one special erosion style between sheet erosion and gully erosion. The rate of soil erosion would be double increased, once rill erosion took place. There is a critical length about one vested slope because the rill erosion occurrence needs a certain length to influx runoff. If there were some measures to cut the length of slope, for avoiding rill erosion occurrence the amount of soil erosion would be decreased significantly. According to the artificial rainfall measures, the result displayed that the drop sill was run through means rill occurrence, and there was an abrupt change about the sediment concentration of runoff when the rill took place. There was a relationship of quadratic parabola between critical slope length of rill and slope grade, and the mean critical slope length on purple cultivated land of slope gradient 10°,15°,20°,25° were 6.25 m,4.19 m,2.77 m and 1.60 m, respectively. For the sake of avoiding rill occurrence, we designed a new cultivation mode, named ‘big cross slope and small along slope’, which was to cut the slope length by ridge and hedgerow for decreasing sediment and reducing slope gradient through long time scale nature erosion.

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