马莲河西川庆阳以上流域水沙关系统计及水保效益计算

Statistics of Runoff-sediment Relationship and Calculation of Soil Conservation Benefits for the Area above Qingyang, Xichuan of the Malian River

通过对马莲河西川庆阳以上流域治理前水沙关系的统计分析,结合该地区的降雨因素及产流特性,给出了适合该流域的产流产沙经验公式,并应用于计算之中。用水文法及水保法对流域水保效益进行计算的结果表明,流域1970～1989年总减水量为2.36～2.46亿m^3,减水效益为5.6％～5.9％;总减沙量为1.66～2.79亿t,减沙效益为10.1％～17.1％。

The author puts forward an empirical formula of runoff yield and sediment production which is suited to the area above Qingyang, Xichuan of the Malian River and applies it into calculation through statistical analysis on the relationship between runoff and sediment of the area before controlling and combining rainfall factors and characteristics of runoff yield and sediment production of the area. The benefits of soil conservation calculated by the method of hydrology and method of soil conservation are shown that during the period of 1970～1989, the total runoff reduction is 236～246 million cubic meters and the benefit 5.6％～5.9％; the total sediment reduction is 166～279 million tons and the benefits 10.1%～17.1%.