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中文摘要：
为适时地采取侵蚀的预防措施，采用基于日降雨量的半月降雨侵蚀力计算方法、气候趋势系数法、降雨集聚指数法等，对大同市年降雨侵蚀力的变化特征、年内降雨侵蚀力变化特征进行分析。结果显示：大同市年降雨侵蚀力具有周期波动特征，趋势系数显示大同市区每10年降雨侵蚀力上升21．8MJ·mm·hm^-2·h^-1，其他县区每10年降雨侵蚀力具有不同程度的减少趋势。年内分析结果显示，大同市降雨侵蚀力主要分布在6—9月，集聚指数介于20．85～23．67之间，均大于均匀分布时8．3的水平。
英文摘要：
Rainfall is a principal factor that causes soil erosion. In order to take prevention measures of erosion timely, analysis on the temporal characteristics of rainfall erosivity of Datong City is conducted by using Richardson rainfall erosivity method, climate tendency coefficient, precipitation concentration index and cumulative percent analysis method. The result shows that annual rainfall erosivity fluctuates periodically; Rainfall erosivity every ten years of Datong urban region tends to increase by 21.8 MJ·mm·hm^-2·h^-1, and that of other counties tends to decrease to different degrees; Rainfall erosivity of Datong City concentrates in June, July, August and September and the concentration index is between 20.85 - 23.67, which is larger than 8.3 at which the rainfall erosivity distributes evenly.
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