李子溪流域水土流失及泥沙输移规律初步研究

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，分别建立了输水利沙量、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

Soil/water loss and sediment transportation in Liziqi valley

In order to investigate the rule of soil erosion and sediment transportation in basins of the upper Yangtze river,the Lin stream,a tributary of the middle Jialing river,has been selected as a typical basin to be analysed and studied.Based on the data of rainfall,runoff and sediment transportation obtained from site investigation,field test and observed from 1960 to 1991,equations for calculating the sediment amount and the maximum sediment discharge have been established respectively by using single-factor correlation analysis and multi-factor regression analysis.With reference to the principle of the instantaneous unit hydrograph of runoff and on the basis of the linear hour-invariant system,the model of instantaneous unit hydrograph of sediment transportation has been established.The hydrograph of sediment discharge at the basin exit section can be obtained by means of convolution of the unit hydrographof sediment transportation and the net soil erosion of a time interval.The model has been verified by using data from other basins.