黑河流域主要水文要素变化特征分析

综合应用数理统计分析、差积曲线分析及坎德尔(K endall)秩次相关检验等方法,结果表明,黑河流域降水量总体上平缓,但最近几年的平均降水量较多年平均值小;蒸发量大于实际降水量,其值相对稳定;径流量年际变化大,受降水和蒸发的影响,呈减小趋势,且趋势显著;气温日较差大,积温有效性高。

Characteristics of Major Hydrological Factors in the Heihe River Basin

The methods of statistics,accumulated difference and the Kendall's rank verification were used comprehensively in this paper.The results showed that,in the Heihe River Basin,the annual precipitation is gently in general.In recent years,mean precipitation is lower than the average of long term's;the evaporation,which is relative stable,is bigger than the precipitation;the runoff varied dramatically from year to year,cut down notably,as the impact by precipitation and evaporation;the temperature daily amplitude is big and the accumulated temperature is of high efficiency.