论文部分内容阅读
基于物理过程基础上的WEPP土壤水蚀预报模型将坡面侵蚀分为细沟侵蚀和细沟间侵蚀,建立了独立的细沟间模型和细沟模型。其中细沟侵蚀产沙方程从概念上可以预报细沟侵蚀过程,但没经实验或理论验证。该文经过理论分析表明,WEPP模型中的剥蚀率是水流含沙量的线性函数,并由给定的试验条件计算得到了函数中的参数。将理论分析结果和已有的实验结果进行了比较,验证了WEPP中的侵蚀产沙模型。同时将已得到的确定细沟剥蚀率的微分方程代入细沟侵蚀产沙方程并求解,从理论上得到了含沙量随沟长变化的函数关系。将理论分析结果和由实验所得的结果进行了对比,进一步验证了WEPP中的侵蚀产沙模型。该文从细沟剥蚀率和产沙量两方面对WEPP模型中细沟侵蚀产沙模型进行了验证。
Based on the WEPP soil water erosion prediction model based on physical processes, the slope erosion is divided into rill erosion and erosion between the two ravines, and an independent inter-rill model and a rill model are established. Among them, the rill erosion and sediment yield equation can predict the rill erosion process conceptually, but has not been verified experimentally or theoretically. The theoretical analysis shows that the erosion rate in the WEPP model is a linear function of the sediment concentration in the water and the parameters in the function are calculated from the given experimental conditions. The results of theoretical analysis and the existing experimental results are compared to verify the WEPP model of erosion and sediment yield. At the same time, the differential equation of the denudation rate of the rill obtained is substituted into the erosion and sediment yield equation of the rill and solved, and the function of the sediment concentration as a function of the groove length is obtained theoretically. The theoretical analysis and the results obtained from the experiments are compared to further validate the WEPP model of erosion and sediment yield. In this paper, the model of rill erosion and sediment yield in WEPP is validated from both the denudation rate and the sediment yield.