水文地质计算中的有限单元和边界单元交连耦合法

 本文提出的有限单元和边界单元交连耦合法(CFEBEM)可作为地下水流场和水文地质参数正反演计算的有效工具。该方法改进了Liggett(1983)的代入耦合法,通过内边界节点组和交连方程,实现有限单元和边界单元的多区耦合。CFEBEM方法发挥了有限单元和边界单元各自的特长,具有单元区划分灵活、方程组装简便和计算精度高等特点,可有效地解决结构复杂含水层及大型密集抽水条件下的流场计算和水文地质参数反演。在太原岩溶地下水资源评价和合理开发研究中的应用,证明了这种方法的有效性。

THE CONJUNCT FINITE ELEMENT-BOUNDARY ELEMENT METHOD IN HYDROSEOLOGICAL CALCULATION

A new numerical method, Conjunct Finite Element-Boundary Element Method (CFEBEM), is proposed here to carry out the calculation of ground water flow and the inversion of hydro-geological parameters. The CFEBEM differs from the BIEM-FEM (Liggett, 1983) and the CFBEM (Brebbia, 1980) m setting up the eguation set of global system and defining the variables on the Interzonal Boundaries (IB). The Node Set on the IB and the Conjunct Eguation Method are employed for CFEBEM, whereas the Substituting Variable Method is used for the BIEM-FEM and the CFBEM. The CFEBEM can make division of zones more flexible than the BIEM-FEM and the CFBEM. The CFEBEM shows the flexibility of the FEM and the high accuracy of the BEM So The CFEBEM can be used to solve problem of the forward and inverting calculation in ground water system with complex structures. An application to the groundwater system of Taiyuan area has demonstrated the efficiency of this technique.