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《Journal of Soil Water Conservation》 2004-01
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Changes in Statistical Feature of Recent Precipitation and Runoff in Upper Reaches of Yellow River Regine

LIU Chao, QIU Yi, DENG Na (Institute of Water Resources Xi'an University of Technology, Xi'an 710048)  
According to the effect of climate on runoff, this paper adapts method of hypothesis testing to investigate the changes of the quantity of precipitation, runoff and the trends of theirs during last 30 years in three rivers: Tao River, Huangshui River, Datong River, the tributary rivers of upper Yellow River and in Tangnaihai basin. Meanwhile to study features in basin storage and runoff yielding and flow concentrating of the catchments, the tests are applied for each of the catchments to quantity of duration runoff in dry season, flood season and to annual runoff and corresponding duration precipitation. The causes of the change are also discussed in this paper. The analysis results indicate that the quantity of runoff of all basins has decreasing trend with different levels. The changes of the quantity both of precipitation and runoff of Huangshui and Datong River are not notable, meaning that statistically natural hydrologic conditions in these two basins keep no change. The quantity of precipitation on Tao River basin decreases remarkably, and most seriously at its downstream region. In aspect of runoff, the trend of the quantity of flood season on Tao River basin is different from that of precipitation. It is inferred that human activities have changed the feature of temporal distribution of runoff. Although a slightly changed precipitation appears in Tangnaihai catchment, the decreasing trend of low water runoff quantity is outstanding. Why that happed need to be investigated and studied further yet.
【Fund】: 国家"973"重点基础研究发展规划项目(G19990436);; 国家自然科学基金项目(50079021)
【CateGory Index】: P333
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