SPATIALLY VARIED SOIL-EROSION UNDER DIFFERENT CLIMATES

被引：26

作者：

JULIEN, PY

DELTANAGO, MG

机构：

[1] Engineering Research Center, Colorado State University, Fort Collins, CO, 80523, Foothills Campus

[2] Laboratorio de Hidraulica e Hidrologia, E.T.S. De Ingenieros de Montes, Universidad Politecnica de Madrid, Madrid

来源：

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | 1991年 / 36卷 / 06期

关键词：

D O I：

10.1080/02626669109492541

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

The spatial variability of the factors of the universal soil loss equation is examined on the mediterranean basin of Conca de Tremp covering 43.1 km2 in Spain. The evaluation of the rainfall erosivity R and the soil erodibility K is relatively straightforward and spatially-averaged values of these parameters can be applied to the entire basin. Conversely, the spatial variability of annual soil erosion losses on large basins depends primarily on the factors L, S, and C describing topographic, vegetation and land use parameters. A grid size analysis of soil erosion losses from the Conca de Tremp basin under mediterranean climatic conditions in Spain shows excellent agreement with the earlier results on the Chaudiere basin in Canada. It is concluded for both basins that unbiassed estimates of soil erosion losses are obtained for grid sizes less than about 0.125 km2. The analysis of the Conca de Tremp basin validates the use of the grid size factor proposed by Julien & Frenette (1987). It is also found that the grid size factor primarily depends on the average slope gradient which decreases with increasing grid size or drainage area. On the other hand, the grid size factor does not depend on the spatial variability of the factors R, K, L and C.

引用

页码：511 / 524

页数：14

共 28 条

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