土壤水盐运移的简化数学模型在水盐动态预报上的应用研究

对土壤水盐运移的确定性数学模型 ,采用数值模拟的简化法 ,实现对方程的求解。并引入水分运动原理、质量守恒原理 ,根据地下水、土壤水盐运动的特点 ,建立土壤剖面含水量分布的概化模型和土壤盐储量的预报模型。以期从土壤水盐运动的机制出发 ,提出一种应用简化数值模拟方法来预报土壤水盐动态的途径。同时为适应大面积田间土壤盐分预报的特点 ,希望不通过方程的求解来达到应用简化数学模型实现水盐动态预报的目的。所建简化数学模型可为田间大面积土壤水盐动态预测预报提供参考

Study of Simplified Transport Model on Forecasting the Water-salt Regime of Salt-affected Soil

The convection-dispersion equation was brought forward at first,and then a simplified method was applied for the solution of the equation. According to the character of underground water and the water-salt transport, the general distribution model of water content and the total salt forecasting model were built respectively on the theoretical basis of mass transport and conservation of water. The paper aimed at understanding the mechanism of water and salt transport. It is expected to bring forward a new method to forecast the regime of water-salt. Furthermore, according to the actual situation, a simplified method without complex calculation was applied on forecasting the distribution of salt-affected soil resource. The results shows the simplified model in this paper was reliable, and it is helpful on forecasting the regime of water and salt at large scale.