微地形条件下地表填洼量计算方法研究

Calculation of Surface Depression Storage under Micro-Topography Condition

地表填洼量是地表相对低洼处蓄存的水量,与地表径流与土壤侵蚀过程有直接关系。本文通过模拟黄土坡耕地普遍采用的人工锄耕和人工掏挖耕作措施下地表特征,探讨了地表填洼量的计算方法。结果表明:地表洼地空间分布较随机,人工掏挖措施下呈斑点大而少,人工锄耕下斑点小而多的特征;地表填洼量与坡面洼地面积呈显著正变函数关系,可以作为研究区坡耕地上人工锄耕和人工掏挖措施下地表填洼量的计算公式。

Soil surface depression storage is expressed by relative water storage derived from surface as opposed to lower areas,which has direct relationship with soil surface runoff and soil erosion.This paper discussed the calculation method of soil surface depression storage through simulating soil surface characteristics under general used artificial digging and artificial backhoe of loess slope land.Results showed that： the spatial distribution of soil surface depression land was stochastic with characteristics of large and few specks under artificial digging and small and many specks under artificial backhoe;There was a significant positive variable function relationship between soil surface depression storage and slope depression areas,which could be used as the calculation formula for soil surface depression storage under artificial digging and artificial backhoe of slope land.