密云水库流域降雨径流侵蚀力时空分布研究

An Analysis on Spatial-temporal Distribution of Rainfall Erosivity in Miyun Reservoir Watershed

降雨是引起土壤侵蚀的主要动力因素，而降雨侵蚀力是引起土壤侵蚀的主要动力因子，对于降雨侵蚀力时空分布规律的定量研究是进行土壤侵蚀预报的基础.以密云水库流域地区10个雨量站2000-2004年逐日降雨资料为基础，依据有关降雨侵蚀力的计算方法，估算该不同地区的降雨侵蚀力，并在ArcInfo软件支持下对所得结果进行时空分布规律的分析.结果表明：（1）在空间分布上，密云水库流域多年年均降雨侵蚀力总体趋势是由东向西递增.（2）降雨侵蚀力的月分布情况与降雨量的月分布情况大致相一致，且月R值的年内变化显著.

Rainfall is the main dynamic factor that causes soil loss and rainfall erosivity is the main dynamic factor. Estimating the rainfall erosivity accurately and analyzing the spatial distribution and temporal change of rainfall erosivity are key to predicting soil erosion. According to the daily day rainfall data between 2000 and 2004 from 10 stations, the R values of different areas in Miyun Reservoir were calculated. A Spatial-temporal distribution analysis and research on the result were made based on the support of Arclnfo software. The result shows： （1） The spatial distribution of rainfall erosivity shows the increasing trend from the east to the west （2）. The spatial distribution of rain-fall erosivity is similar to the distribution of rainfall, and the monthsly change is significant.