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昭平台水库是淮河上游一座重要的防洪工程,由于库区的水土流失造成的泥沙淤积严重,加强库区水土流失治理与监督监测尤为必要。而降雨侵蚀力的时空分布规律研究则是实现区域土壤侵蚀定量监测预报的重要基础。本文利用昭平台库区上游20年雨量站17年的资料对该区年降雨侵蚀力进行了分析研究,利用中汤代表站次降雨过程资料计算分析了区域降雨侵蚀力的年内分布特征。区内降雨侵蚀力年间变化规律同雨量变化总体趋势相同,并呈现4~5年的变化小周期,空间上从西南至东北逐渐减小,并形成一个高值区和一个低值区;年内R值集中分布于6~8月,占年R值75.4%,同月雨量的分布一样呈单峰型,最大值均出现于8月份。
Zhaopingtai Reservoir is an important flood control project in the upper Huaihe River. Due to the serious siltation caused by soil erosion in the reservoir area, it is especially necessary to strengthen the monitoring and control of soil and water loss in the reservoir area. However, the research on the spatial and temporal distribution of rainfall erosivity is an important basis for the quantitative monitoring and prediction of regional soil erosion. In this paper, the annual rainfall erosivity in this area was analyzed by using the data of 17 years of rainfall stations in the upper reaches of ZhaopingTai Reservoir, and the annual distribution of regional rainfall erosivity was calculated by using the data of sub-rainfall events on the representative stations of ZhongTang. The change law of rainfall erosivity in the year is the same with the change tendency of rainfall, and shows a small period of 4 ~ 5 years of change, decreasing in space from southwest to northeast and forming a high value region and a low value region. During the year, R Concentration of values concentrated in June to August, accounting for 75.4% of the annual R, the same month rainfall distribution showed a single peak, the maximum appeared in August.