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以2000—2008年的TRMM3B42数据为基础,在ARC/INFO软件提供的地图代数运算功能支持下,利用日降水量估算降水侵蚀力,对西藏地区降水侵蚀力及其年内分配和年际变化的空间分布特征进行了分析。结果表明,西藏地区降水侵蚀力大体呈由东南向西北递减的趋势,地区差异大。降水侵蚀力年内分配集中度呈由东南向西北增加的趋势,降水侵蚀力越小的地区,年内降水侵蚀力分布越集中。西藏自治区降水侵蚀力在2000—2008年的年际变化同样存在空间分异,整体上呈现降低的趋势。
Based on the data of TRMM3B42 in 2000-2008 and using the map algebra function provided by ARC / INFO software, the daily rainfall amount is used to estimate the precipitation erosivity, and the erosive power of precipitation and the distribution and interannual variability in the year of Tibet Distribution characteristics were analyzed. The results show that the precipitation erosivity in Tibet tends to decrease from southeast to northwest, with large differences in the region. The distribution of precipitation erosivity tends to increase from southeast to northwest during the year, and the distribution of precipitation erosivity is more concentrated in the areas where the erosion erosive power is smaller. The interannual variability of rainfall erosivity in the Tibet Autonomous Region during the period of 2000-2008 also shows a spatial differentiation, showing an overall downward trend.