疏勒河上游径流年内分配变化规律分析

Changes of Annual Runoff Distribution on the Upper Reaches of the Shule River

以1956—2010年疏勒河出山口控制水文站昌马堡站的实测径流序列为基础,应用年内分配比例、年内不均匀系数、集中度和集中期、变化幅度等指标,分析了疏勒河上游径流年内变化规律。结果表明:1956—2010年,疏勒河上游径流年内分配格局基本稳定、集中度降低、集中期变化稳定、绝对变化幅度增大、相对变化幅度减小,非汛期径流量占年径流量的比例有所增大,汛期径流量占年径流量的比例有所减小,径流年内分配过程渐趋均匀。气候变暖可能导致了疏勒河上游非汛期冰雪融水及降水量的增加,在一定程度上增加了非汛期径流量。

Annual runoff distribution is connected with climate chanfe and human activities. The chanfes of annual runoff distribution may influence water resources manafement and ecolofical health. Based on runoff data observed by the Chanfmabao Hydrolofical Station,indexes of unevenness,concentration,and variation were used to reflect the chanfes of annual runoff distribution of the upper reaches of the Shule River durinf 1956-2010. The results show that the annual inhomofeneity of runoff distribution is decreasinf,as well as runoff concentration and relative variation amplitude. In the situation of runoff increase,the proportion of water quantity in non-flood season is increasinf and the intra-annual distribution of runoff tends to uniform fradually,which is possibly caused by climate warminf and precipitation variation. Climate warminf may lead to increase in water quantity of snowmelt and precipitation in non-flood season,which to some extent causes an increase of runoff.