新疆河流径流特征分析

选择了新疆众多河流中代表性好的7条河流，对径流的特征进行了分析。结果表明，新疆河流径流量主要集中在夏季，占年径流量的50．8％—70．7％，春、秋季径流量差别不大，冬季仅占年径流量的4．7％—10．8％。以7条河流径流深值可看出，北疆径流深值比南疆大，最大的是布尔津河，径流深为507．4mm。从径流量的Cv值看，除头道沟为0．44，极值比4．42较大外，其它河流的Cv值均在0．19—0．23间、极值比在1．85—2．42间。同时，新疆大多数河流径流量90年代后有明显增多的趋势。

Analysis of The Characters of The Runoff of The Xinjiang Rivers

The runoff characters of the seven selected rivers are analyzed.It shows that the runoff volumn is concentrated in the summer,whose ratio is between 50.8% and 70.7% for the whole year.The runoff volumns between the spring and autumn aren't significant.The runoff volumn ratio in the winter is only between 4.7% and 10.8%.The runoff depth value in the north region is higher than that in the south region.The biggest value is from Buerjing river,whose runoff depth is 507.4 mm.The runoff volumns of the other six rivers are between 0.19 and 0.23 and the extreme value is between 1.85 and 2.42 except the Toudao ditch,whose runoff volumn is 0.44 and whose extreme value is 4.42.Most of the Xinjiang rivers has bigger runoff volumn than that of the 1990s.