摘要
通过对北京地区20个气象站雨量资料的回归分析,发现可用公式R=5.2562F_F^(1.3057)来估算北京的降雨侵蚀力,其中F_F是由逐月雨量计算而来的一种指标。用此公式计算了北京113个站点的R值,绘制了降雨侵蚀力等值线图,发现北京的R值变化于2144.0～6682.7 MJ·mm·hm^(-2)·h^(-1)·a^(-1)。由北部和西部山地所组成的弧形山脉R值最高,并呈现向西北、东南方向递减的趋势。研究结果可为北京的水土保持规划和评价提供依据。
The study was to estimate the rainfall erosivity of Beijing and analyze the spatial distribution. Precipitation data from 20 weather stations in Beijing were used. The results indicated the equation R = 5.256 2FF1.305 7 was fit for estimating the erosivity, in which FF was an index based on monthly rainfall amount. With the equation, for each of 113sites of Beijing, the erosivity was calculated and an isoline map of erosivity was plotted. It is found from the map that the Rainfall erosivity of Beijing varied from 2 214.0 to 6 682.7 MJ·mm·hm-2h·-1·a-1. The value of erosivity was high in the northern and western mountainous area, then decreased to eastern and southern direction.
出处
《中国水土保持科学》
CSCD
2003年第1期16-20,共5页
Science of Soil and Water Conservation
基金
国家自然科学基金项目(40171059)
国家教育部重点科技项目
