Runoff Conditions and Runoff Coefficient of the Wind-water Erosion Crisscross Region on the Northern Loess Plateau
Runoff Conditions and Runoff Coefficient of the Wind-water Erosion Crisscross Region on the Northern Loess Plateau
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发表时间：
2013
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通讯作者：
Luo Long-bi
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作者：
Luo Long-bi
为估算黄土高原北方水蚀风蚀交错带的径流条件和径流系数，为进一步研究黄土高原水蚀风蚀交错带地表水资源提供依据。一个被称为六道沟的流域，具有代表性的水文和气象特征的风-以黄土高原水蚀交错带为研究对象，通过对实测资料的分析，当降雨持续时间较长、强度较小时，表层土壤是产流的必要条件（厚度5- 10 cm）达到饱和，雨强≥0.12mm/min，当出现短历时、高强度降雨时，产流的必要条件是雨强≥0.52mm/min，产流率与平均雨强成正比;基于运动波理论，结合GIS技术，建立了研究区径流的数学模型，其数值计算误差小于3%，五年平均径流系数（2005-2009年）为0.11，在此基础上，年平均径流系数约为0.10~0.15。
With an aim to estimate runoff conditions and runoff coefficient,to provide the basis for further studies on surface water resources at the wind-water erosion crisscross region on the northern Loess Plateau,a catchment known as Liudaogou which has representative hydrological and meteorological characteristics of the wind-water erosion crisscross region on the Loess Plateau was chosen as the study site.Runoff conditions were clarified through analysis of the observed rainfall-runoff data.When a long duration with low intensity rainfall occurred,the necessary condition for runoff generation was the topsoil(thickness:5—10cm)attained saturation and rain intensity ≥0.12mm/min;when a short duration with high intensity rainfall occurred,the necessary condition for runoff generation was rain intensity≥0.52mm/min;runoff ratio was proportion to the average rain intensity;a numerical model for rainfall-runoff has been developed for the study site based on kinematic wave theory combining with GIS and its error in numerical calculation is less than 3%.Average runoff coefficient for five years(2005—2009)was estimated to be 0.11based on which the annual mean runoff coefficient was approximately estimated as 0.10~0.15.