果树蓄水坑灌法单坑水分入渗数值模拟及分析

Numerical Simulation and Analysis of Moisture Infiltration of Single Water Storage Pit in Fruiter Water Storage Pit Irrigation Method

根据果树生理特性与土壤水动力学理论,建立了非恒定水位复杂边界条件下的蓄水单坑均质土入渗及土壤水分运动的数学模型,并采用交替方向隐式差分法进行求解。其模拟结果与实测结果吻合较好,表明利用该方法模拟蓄水单坑的水分入渗问题是可行的。用本模型模拟了不同条件下的入渗过程,并对入渗规律的影响因素进行了分析,为蓄水坑灌理论与灌水技术要素的深入研究做了一些基础性的工作。

Based on the physiological characteristics of fruiter and the theory of moisture transfer in unsaturated soil, a numerical model with non-constant water level and complex boundary condition is established. Alternating direction implicit iteration method is developed for simulation. The results of the numerical simulation and experiment are basically in accordance. It shows that the model can be applied to simulate the infiltration movement of water storage pit. Then numerical simulations of different condition are performed to analyze the influence factors of infiltration law. The results would greatly benefit the study on the water storage irrigation theory and irrigation technology.