Analysis of the Characteristics of Runoff in Wuyuerhe River Basin

Runoff generated in the upper Wuyuerhe River Basin is water resource supplied for the middle and lower reaches.The study on time series characteristics of runoff in the upper Wuyuerhe River Basin has certain scientific significance for the reasonable exploitation of water resources and eco-environmental protection.In this paper,with 1956-2006 runoff series at 2 hydrological stations and precipitation series at 8 precipitation stations of the upper Wuyuerhe River Basin,the runoff characteristics were analyzed with multiple indexes and a series of methods.The results showed that: 1) Distribution of annual runoff was uneven,and mainly focuses on July and August.The inter-annual variations were great,with significant difference between the wet year and dry year;2)annual runoff changes had obvious stages and the tendency of annual runoff reduction was significant;and 3) annual runoff changes had a main period of about 41 years,with an abrupt point happening in 1964.The decrease of precipitation and human activities are the key factors influencing the runoff.