1引言山西地处黄土高原，山区丘陵区面积占总面积的80.3％。由于植被稀疏，造成省内三分之二的面积有不同程度的水土流失，使大量泥沙淤积水库，降低了水库蓄水调洪能力。解放以来，山西省共修建大中小型水库960座，总库容32．7亿m3，现已淤积8.2亿m3，等于每年损失一座中型水? 1 Introduction Shanxi is located in the Loess Plateau, mountainous hilly area of ​​the total area of ​​80.3%. As a result of sparse vegetation, two-thirds of the province’s area has varying degrees of water and soil loss, leaving a large number of silt reservoirs, reducing the reservoir water transfer flood control ability. Since the liberation, a total of 960 large, medium and large reservoirs have been built in Shanxi Province, with a total storage capacity of 3.27 billion m3 and a deposition of 820 million m3, equivalent to an annual loss of medium-sized water.