| THE EQUIVALENT SLOPE -A NEW METHOD FOR CALCULATING SOIL LOSS FROM IRREGULAR SLOPES |
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| 作者姓名： | XiaoguangZHAO HuiSHI Ming＇anSHAO |
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| 作者单位： | [1]DepartmentofGeologyandEnvironmentEngineer,Xi＇anUniversityofScienceandTechnology,Xi＇an,710054 [2]SchoolofEnvironmentalandMunicipalEngineering,Xi＇anUniversityofArchitetureandTechnology,Xi＇an710055,P.R.China [3]TheStateKeyLaboratoryofSoilErosionandDrylandFarmingintheLoessPlateau,Yangling,Shaanxi,712100 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，The authors thank Professor Tian Junliang and anonymous referee for their useful comments and corre correction |
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| 摘 要： | he slopes in field conditions are always irregular, but the supposed uniform slopes are used in most erosion models. Some studies used several uniform slopes to approximate an irregular slope for estimating soil erosion. This approximation is both time-consuming and weak in physical insights. In this paper, the concept of equivalent slope is presented based on that runoff potential on uniform slope is equal to that of irregular slope, and the equivalent uniform slope is used to estimate soil erosion instead of the irregular slopes. The estimated results of slope-length factors for convex and concave slopes are consistent with those from the method of Foster and Wischmeier, The experiments in the southern part of the Loess Plateau in China confirmed the applicability of the present method. The method is simple and has, to some extent, clear physical meanings, and is applicable for estimating soil erosion from irregular slopes.
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| 关 键 词： | 水土流失 不规则斜坡 侵蚀模型 近似值 |
THE EQUIVALENT SLOPE - A NEW METHOD FOR CALCULATING SOIL LOSS FROM IRREGULAR SLOPES |
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| Xiaoguang ZHAO,Hui Shi,Ming''''an SHAO.THE EQUIVALENT SLOPE -A NEW METHOD FOR CALCULATING SOIL LOSS FROM IRREGULAR SLOPES[J].International Journal of Sediment Research,2004,19(3):202-209. |
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| Authors: | Xiaoguang ZHAO Hui Shi Ming'an SHAO |
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| Abstract: | The slopes in field conditions are always irregular, but the supposed uniform slopes are used in most erosion models. Some studies used several uniform slopes to approximate an irregular slope for estimating soil erosion. This approximation is both time-consuming and weak in physical insights. In this paper, the concept of equivalent slope is presented based on that runoff potential on uniform slope is equal to that of irregular slope, and the equivalent uniform slope is used to estimate soil erosion instead of the irregular slopes. The estimated results of slope-length factors for convex and concave slopes are consistent with those from the method of Foster and Wischmeier.The experiments in the southern part of the Loess Plateau in China confirmed the applicability of the present method. The method is simple and has, to some extent, clear physical meanings, and is applicable for estimating soil erosion from irregular slopes. |
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| Keywords: | Soil loss amount Irregular slope Equivalent slope |
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