中国水土保持科学2011，Vol.9Issue(5)：54-59,6.
清涧河流域近50年径流时间变化特征及趋势分析
Temporal variations and trend analysis of runoff in Qingjianhe River in Yellow River midstream area in the past 50 years
摘要
Abstract
Based on the data set of runoff of the Yanchuan Hydrological Station, Qingjianhe River, in the past 50 years, annual unevenly distribution coefficient of runoff, complete accommodation coefficient, concentrative degree (concentrative period) , variation coefficient and runoff extremum ratio of the station were calculated and analyzed, which indicated the annual and interannual variations of runoff. The long-term variation tendency of the runoff in the Qingjianhe River Basin was verified by the tendency analysis method. The results demonstrate that the annual analytic curve of annual distribution of runoff in Qingjianhe River Basin occurred unimodal curve, and the runoff mainly distributed during July to September, which accounted for 58% of average annual flow. Since 1990s, the annual unevenly distribution and concentrative degree had a gradual decrease. The interannual runoff in different periods varied so greatly to reach the peak of past 50 years after 2000. The annual runoff in this basin presented a significant downtrend, which was supported by the facts that 1980s was the remarkable turning point of the runoff from high to low water level period, and after 2000 runoff turned into the low-water period and reached the lowest level in the past 50 years. The evolution of runoff in Qingjianhe River Basin shows theclear nonuniformity, periodicity and tendency, which is related with the rainfall and characteristicvariation of underlying surface caused by restoring vegetation.关键词
土地利用动态变化/降水/不均匀性/趋势/清涧河流域Key words
land-use dynamic change/rainfall/nonuniformity/tendency/Qingjianhe River Basin引用本文复制引用
王计平,赵梅,程复,姜磊,王然..清涧河流域近50年径流时间变化特征及趋势分析[J].中国水土保持科学,2011,9(5):54-59,6.基金项目
林业公益性行业科研专项“黄土高原生态恢复对径流泥沙影响评价技术研究”(201004058) （201004058）
中国博士后科学基金“黄河中游植被恢复格局对流域径流泥沙的影响”(20100480365) （20100480365）
