大伙房水库降雨蒸发变化趋势分析

根据大伙房水库站历年降水蒸发资料系列,采用常规的线性回归和滑动平均法对降雨和蒸发变化趋势进行分析,应用游程检验法、Mann-Kendall秩次相关检验法和Spearman秩次相关检验法进行一致性的对比和验证。结果表明:大伙房站近56年来,年降水量、汛期降水量、非汛期降水量呈缓慢减少趋势;年蒸发量呈缓慢下降趋势,汛期蒸发量呈缓慢上升趋势,非汛期蒸发量呈明显下降趋势。

Analysis on changing trends of precipitation and evaporation of Dahuofang Reservoir

In accordance with the data serieses of the precipitation and evaporation of Dahuofang Reservoir over the past years，the changing trends of the precipitation and evaporation therein are analyzed herein with the conventional linear regression and the method of moving average，and then the run-length testing method，Mann-Kendall rank correlation test and Spearman’s rank correlation test are adopted for comparing and verifying the consistencies concerned. The result shows that the annual precipitation，flood season precipitation and non-flood season obtained at Dahuofang Hydrological Station present the trends of slowly decreases，while the annual evaporation presents a trend of slowly decrease，the flood season evaporation presents a trend of slowly increase and the non-flood season evaporation presents a trend of slowly decrease therein in the recent 56 years.