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Multiple Time Scale Analysis of river Runoff Using Wavelet Transform for dagujia river Basin, Yantai, China

Chinese Geographical Science 2009年第2期19卷 158-167页

作者： LIU Delin LILT Xianzhao LI Bicheng ZHAO Shiwei LI Xiguo Research Center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of Education Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China College of Geography and Resource Management Ludong University Yantai 264025 China Yantai Hydrology and Water Resource Survey Office Yantai 264025 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Based on monthly river runoff and meteorological data, a method of Morlet wavelet transform was used to analyze the multiple time scale characteristics of river runoff in the dagujia river Basin, Yantai City, Shandong Province. The results showed that the total annual river runoffin the dagujia river Basin decreased significantly from 1966 to 2004, and the rate of decrease was 48× 10^6ma/10yr, which was higher than the mean value of most rivers in China. Multiple time scale characteristics existed, which accounted for different aspects of the changes in annual river runoff, and the major periods of the runofftime series were identified as about 28 years, 14 years and 4 years with decreasing levels of fluctuation. The river runoff evolution process was controlled by changes in precipitation to a certain extent, but it was also greatly influenced by human activities. Also, for different time periods and scales, the impacts of climate changes and human activities on annual river runoff evolution occurred at the same time. Changes in the annual river runoffwere mainly associated with climate change before the 1980s and with human activities after 1981.

关键词： multiple time scale river runoff climate change Morlet wavelet transform dagujia river

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