降雨过程对地表糙度的影响

The Course Rainfall Effect on Surface Roughness

通过野外模拟降雨试验,研究降雨过程中,不同坡度、雨强以及不同地表覆盖度下地表糙度的变化情况。利用测点法测量每次降雨前后的地表糙度值,确定坡度、雨强以及地表覆盖度变化对地表糙度的影响。结果表明,相同雨强下,地表裸露、土壤一定时,坡度越大,地表糙度变化越大;同一地表,土壤一定且坡度相同的情况下,雨强越大,地表糙度变化越大;在同一坡面,雨强一定的条件下,植被覆盖度越小,地表糙度变化越大。研究结果为地表糙度影响因子的研究和揭示地表糙度的本质特征提供了一定的理论依据,同时也可服务于黄土高原坡耕地水土流失的治理和退耕还林(草)工程的实施。

Based on field artificial rainfall experiments,the soil surface roughness changes after precipitation process,based on different slope,rainfall intensity and surface coverage,were studied.The changes of surface roughness were measured before and after each rainfall,in older to determine the effects of the slope,rainfall intensity and soil surface coverage on the surface roughness.The results showed that the more slopely,the greater the changes in surface roughness,under a certain soil and same rainfall intensity.When the soil and slope is the same,the grater rainfall intensity,the more changes in surface roughness.When the rainfall intensity is the same,the low cover rates,more changes in surface roughness.The results provide a certain theoretical basis,to research the impact factors of the surface roughness and reveal the substantive characteristics of the surface roughness.And also useful for the controlling of the soil erosion and the carring out of returning farmland to forest（grassland） project on the Loess Plateau.