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Characteristics of Precipitation in the Middle Yellow River and Its Effects on Sediment Entering into the Yellow River in 1980's

Wang Yunzhang et al. (Hydraulic Research Institute of YRCC, zhengzhou, 450003)  
The average annual precipitation in the middle Yellow River was 464mm in 1980's, which is the least in the last 40 years, especially the precipitation is mostly reduced in July and August. The area of little rainfall is mainly located in the north and middle region of He-Long reach due to the effects of summer monsoon and variations of topography. It is just the cuase resulting the amount of sediment entering into the Yellow River from that reach sharply reduced that heavy rainfall and rainstorms were remakably reduced in the main sediment yield area, esoecially in He-Long reach.
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