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用方差分析与相关分析的方法对陕北主要河流无定河、清涧河、延河流域的年降雨、径流、输沙资料进行了统计分析。结果表明，各河流域的年降雨量随年代的推移呈减少趋势；各河流域的输沙量有极显著的差异，尤以无定河与清涧河的差异最为显著。各河流的输沙量随年代的进程也以减少的趋势在变化。通过对三河流域的降雨、输沙等变化规律的讨论，为发展三河流域的农业生产，制定水利水保的长期规划提供了一定的水文依据。
By means of analysis of variance and correlation analysis, the annual rainfall, runoff and sediment transport data of Wudinghe, Qingjianhe and Yanhe river basins in northern Shaanxi were statistically analyzed. The results show that annual rainfall in all river basins decreases with the passage of time. There is a significant difference in sediment discharge among all river basins, especially the difference between Wuding River and Qingjian River. Sediment discharge by river varies with decreasing trend as the process of generation. Through the discussion of the variation rules of rainfall and sediment transport in the Sanhe River Basin, it provides a certain hydrological basis for the development of agricultural production and the formulation of long-term planning of water conservancy and water conservancy.