Title: Research on the High-Low Flow Variation and the Correlation Between Runoff and Precipitation at the Headwaters of the Aksu River
Abstract: Based on the past 50-a runoff and precipitation data at Shaliguilanke and Xiehela Hydrological Stations in the Aksu River,variation trend and correlation in various time scales between precipitation and runoff from the above two stations were analyzed by using the Z index method,t-test,non-parametric test and wavelet transform.It is found that: 1) the runoff and precipitation at the two hydrological stations had an increasing trend.Runoff increased abruptly at the two stations in 1993,whereas abrupt change point of precipitation occurred in 1985 at Shaliguilanke Station and in 1986 at Xiehela Station;2) the high-low flow index of runoff and precipitation at the two stations changed from dry and normal grades before the abrupt change point to normal and flooded grades after the abrupt change point;3) the main period of runoff variation at the two stations was 7 a and 6 a,respectively,and that of precipitation variation was 7 a and 4 a,respectively;4) runoff and precipitation had positive correlation mainly at Shaliguilanke Hydrological Station and negative correlation at Xiehela Hydrological Station.However,runoff and precipitation presented non-significant positive correlation at two hydrological stations in the period longer than 20 a.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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