| RILL EROSION PROCESS ON STEEP SLOPE LAND OF THE LOESS PLATEAU |
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| 作者姓名： | ZHENG Fenli and TANG Keli |
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| 作者单位： | 1 The English text has been altered and edited by Dr. DING Lianzhen 2 Engineer，National Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau，Chinese Academy of Sciences and institute of Soil and Water Conservati |
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| 基金项目： | The authors wish to thank the financial support from the Foundation of Chinese National
Natural Sciences and the Foundation of |
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| 摘 要： | IntheLoessPlateau,alongtheslopelengthfromthetoptothebottom,soilerosionischaracterizedbyobviousverticalzonaldivision,thatis,sheeterosionzone,sheeterosionandrillerosionzone,rillerosionandshallowgullyerosionzoneandgullyerosionzone.Inthesheetandrillero..sionzone,rillerosionamounttakesup70%ofthetotalsoillossTANGKenetal.,1983,ZHENGFenlietal.,19871;intherillandshallowgullyerosionzone,rillerosionamountaccountsfor30--40%ofthetotalsoilloss.Sorillerosionisamajorerosionpatternonsteepslopeland.Riller…
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RILL EROSION PROCESS ON STEEP SLOPE LAND OF THE LOESS PLATEAU |
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| ZHENG Fenli and TANG Keli.RILL EROSION PROCESS ON STEEP SLOPE LAND OF THE LOESS PLATEAU[J].International Journal of Sediment Research,1997(1). |
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| Authors: | ZHENG Fenli and TANG Keli |
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| Abstract: | Rill erosion processes and principle of preventing rill erosion of different applied measures are studied by rainfall simulation and field investigation. Research results show that rill erosion processes can be schematically divided into five stages, that is, concentrated flow forming process; little waterfalls in the concentrated flow forming Process; little waterfalls developing into rill head cut process; rill head cuts developing to form discontinuous rill process and discontinuous rills connecting to form continuous rill process. Rill head cuts backward erosion, rill wall collapsing and runoff washing rill bed are the main patterns of rill development. The relevant equation between critical runoff volume of occurring rill erosion and slope degree can be expressed as follows: Q = 76. 10 - 2. 10J. And relevant equation between critical slope length of occurrence Of rill erosion and slope degree is parabolic with a minimum-value. In addition, influence of rill erosion development on slope runoff and soil erosion, benefits and principle of reducing rill erosion amount of mulch, non-tillage system and remained residue, strip alternation of grass and crop, horizontal ditch are also studied. |
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| Keywords: | the Loess Plateau Rill erosion process Critical runoff volume Critical slope length Measures of Preventing rill erosion |
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