论文部分内容阅读
为了研究不同田面条件对降雨入渗过程的影响,给出了土壤水运动控制方程的边界条件和初始条件。根据 Green-Ampt 入渗理论首次提出了土壤入渗能力特征的概念,建立了土壤水入渗动力学特征方程。所推导出的降雨或喷洒条件下土壤表层由第1类边界转化为第2类边界的时刻t_p 的计算公式,使土壤水运动基本方程数值计算的收敛性和稳定性在理论上得到保证。全面深松田面处理和开槽田面处理条件下的降雨试验验证表明,用本模型确定 t_p 的准确率比传统模型提高60%。
In order to study the influence of different surface conditions on rainfall infiltration process, the boundary conditions and initial conditions of soil water motion control equations are given. According to the theory of Green-Ampt infiltration, the concept of soil infiltration capacity was first proposed, and the equation of soil water infiltration kinetics was established. The formula of t_p at the time when the soil surface is converted from the boundary of Category 1 to the boundary of Category 2 under rainfall or spraying conditions is deduced, which guarantees the convergence and stability of numerical calculation of soil water movement in theory. Rainfall tests on deep subsoiling and slotted surface show that the accuracy of t_p can be improved by 60% compared with the traditional model.