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Mountainous runoff change in three inland river basin in Hexi Corridor and its influencing factors

ZHANG Xiaoxiao;ZHANG Yu;XU Haojie;ZHU Jiajun;College of Earth and Environmental Sciences,Lanzhou University;  
Base on annual mountainous runoff and rainfall data of three inland river basin in Hexi Corridor during 19612010,rate of linear tendency,MannKendall mutation point inspection,wavelet analysis,R / S analysis and double mass curve analysis were used to analyze interannual mountainous runoff change characteristics and impacts of climatic change and human activities on it. The results showed that:( 1) The mountainous runoff of Shiyang River Basin experienced a weak decreasing trend,while the mountainous runoff of Heihe and Shulehe River Basin showed a significant increasing trend during 19612010. Significant mutation of annual runoff of Heihe and Shulehe River Basin was detected by MannKendall test.( 2) There were four wetdry processes for runoff of Shiyang and Heihe River Basin. Two wetdry regime variations of Shulehe River Basin runoff was found during 19612010.( 3) Three insignificant periodic oscillations( 5year,22year and 15year) existed in annual mountainous runoff of Shiyang,Heihe and Shulehe River Basin respectively by Morlet wavelet analysis.( 4) Double mass curve for rainfall and runoff depth revealed that annual rainfall had a dormant impact on the changes in annual mountainous runoff of Hexi Corridor,contrasted with human activities.( 5) Annual trend of mountainous runoff in study area was persistent. R / S analysis indicated Heihe and Shulehe River had a strong increasing trend,while Shiyang River had a weak decreasing trend in the near future.
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