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为了探讨长江上游流域水土流失及泥沙输移规律，选取嘉陵江中游的支流李子溪为典型流域进行了分析研究。在实地调查、野外测验及应用１９６０年～１９９１年实测降雨、径流、输沙资料的基础上，利用单因子相关分析和多因子回归分析，分别建立了输沙量、最大输沙率计算方程。在此基础上，参照径流瞬时单位线原理，以线性时不变系统为基础，建立输沙瞬时单位线模型。通过输沙单位线与时段净侵蚀量的卷积得到流域出口断面的输沙率过程，最后由其它流域实测资料对模型进行了验证。
In order to investigate the law of soil erosion and sediment transport in the upper reaches of the Yangtze River, Li Zixi, a tributary of the middle reaches of Jialing River, was chosen as a typical catchment. On the basis of field survey, field test and application of the data of rainfall, runoff and sediment transport measured from 1960 to 1991, single factor correlation analysis and multi-factor regression analysis were used to establish the calculation equations of sediment discharge and maximum sediment transport rate respectively. On this basis, referring to the principle of instantaneous unit flow of runoff, the instantaneous unit-line model of sediment transport is established based on the linear time-invariant system. The sediment discharge rate at the exit section of the drainage area is obtained through the convolution of the sand transport unit line and the period of net erosion. Finally, the model is verified by the measured data of other basins.