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中文摘要：
在迭代求解区域饱和-非饱和拟三维渗流模型的基础上，建立区域溶质运移简化模型。该模型将溶质运动在非饱和带简化为一维垂直运动，饱和带简化为二维剖面运动，在非饱和带与饱和带分别形成对流一弥散方程，并通过维持近饱和带溶质质量守恒组成统一的系统，采用有限单元法数值处理技巧，在同一个矩阵方程中求解饱和与非饱和含水层的浓度变化。该模型无需迭代计算，大大减少工作量，为求解区域溶质运移问题提供了新方法。算例验证表明，区域溶质运移简化模型技术可行，结果可信。
英文摘要：
Based on the iterative solution of saturated-unsaturated quasi 3-D water flow model in large scale zone, a simplified model of solute transport was established. In the model the movement of solute in unsaturated area was simplified as a 1-D vertical flow and the transport in saturated area was regarded as a simplified 2-D sectional flow, the convection-dispersion equations for both areas were established respectively. A uniform system was formed by keeping solute mass balance in the vicinity of saturated area. The variation of solute concentration both in saturated and unsaturated aquifers can be solved from one FEM matrix equation without iteration. The feasibility and effectiveness of this model are verified by examples.
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