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应用平坦地区地理单元土壤侵蚀与沉积过程的数学模型,把径流和泥沙浓度作为时间的函数,对亚里桑那(Arizona)州一个干旱小流域(1.3ha)的九次径流进行了分析.引入两个物理定义的参数的特定值后,流域出口实测的泥沙浓度(流量)及相应的时间与该模型相匹配.这两个参数实质上反映一定降雨下土壤的可分散性和由地表径流引起的泥沙悬移系数.第一个参数对任何一次径流前期的泥沙浓度都有很大影响;而第二个参数则主要制约着后期的泥沙浓度 这样就允许对两个参数做出独立的评价.一定地表径流深的土壤可分散性的变化资料取野外试验或与其条件控制相似的试验室观测.
Using the mathematical model of soil erosion and deposition in a geographically flat geographic unit, runoff and sediment concentrations were used as a function of time to analyze nine runoffs in a dry valley (1.3ha) in Arizona. After the introduction of two physically defined parameters, the measured sediment concentration (flow rate) at the outlet of the catchment and the corresponding time are matched with the model, which essentially reflect the soil dispersibility under certain rainfall and the surface water content Runoff caused by the sediment suspended coefficient.The first parameter has a significant impact on the sediment concentration of any previous runoff; while the second parameter mainly restricts the latter sediment concentration This allows to do two parameters An independent assessment of certain surface runoff depth soil dispersibility changes in information field test or its conditions similar to the control laboratory observations.