In the present study,the characteristic of sediment discharge,sediment reduction and the influence of human activities and rainfall on the sediment discharge in the past 50years(since 1955)were analyzed based on the data collected from 48rainfall stations and the main hydrometric stations in the middle reaches of the Yellow River.The results showed that sediment discharge has been decreasing totally from 1955to 2007,it reduced by 46.8%relative to sediment yield before 1970.The reduction rates which were gre...
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