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MODFLOW是目前国际上最为流行的地下水模拟工具。当渗流场中存在自由面穿越不同的模拟层单元时,MODFLOW提供了一种干湿单元转换的方法进行处理。这是与有限元法不同的自由面修正技术。通过河间地块模型和土坝渗流模型两个算例,对MODFLOW模拟自由面渗流问题进行了尝试性的应用,模拟过程中使用干湿单元交替技术处理自由面、使用Drain模块近似处理渗出面。结果表明上述两种处理方法的确增强了MODFLOW模拟自由面渗流问题的功能,但其有效性和精确性还有待进一步论证。
MODFLOW is currently the most popular groundwater simulation tool in the world. MODFLOW provides a method of wet-wet cell conversion when there are free surfaces in the seepage field that traverse different layers of the simulation layer. This is different from the finite element method free surface correction technology. Through the example of inter-river massif model and earth dam seepage model, MODFLOW simulation of free-surface seepage problem is tentatively applied. In the process of simulation, free-wet surface is treated alternately by dry-wet unit, and the Drain module is used to approximate the exudation surface. The results show that the above two methods do enhance the function of MODFLOW to simulate the seepage problem of free surface, but its validity and accuracy still need to be further demonstrated.