Title: Runoff Change of Bahe River Basin in Qinling Mountains and Its Influencing Factors
Abstract: Using runoff data measured by Maduwang station in Bahe River basin during 1959-2010 and combining some mathematical methods such as annual mal-distribution coefficient, wavelet analysis method and M-K mutations point inspection, this paper has analyzed the inter-annual runoff change characteristics and made quantitative analysis of the impacts of climate change and human activities on runoff changes of Bahe River. The results show that: 1) the annual runoff depth distribution in Bahe River basin is extremely uneven, with annual mal-distribution coefficient reaching 0.92; 2) runoff distribution is mainly concentrated in summer and autumn, accounting for 68.15% of annual runoff. The runoff shows an increasing trend from summer to autumn; it is the lowest in spring and winter,highest during mid-July and early August; 3) the annual runoff depth declines on the whole with an average decline rate of 3.0206mm/a; 4) in recent 50 years, Bahe River has different oscillation periods. In the time scale of 20 to 30a, the oscillation is very significant. The annual runoff will continue to increase in the future, and now it tends to be large;the runoff mutation point is 1989, whose primary period of time series is 16 years; 5) Using the relational analysis we have obtained that average annual runoff of Bahe River is closely related to the average annual rainfall. However, human activity is the main factor that causes the runoff decrease and changes of runoff in Bahe River Basin, and precipitation change is the secondary factor. This paper considers only precipitation and temperature factors in climatic analysis, in fact LUCC and evapotranspiration should also be included. Therefore, the specific influencing factors of runoff changes need to be further studied.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 6
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