Abstract

Mathematical model and numerical methods for the solution of coupled surface–subsurface flow in GeRa software is presented. Coupling of surface runoff and subsurface flow models is accomplished using first-order exchange term. The arising nonlinear solver convergence issues are addressed in the article. In order to overcome these issues, approaches for handling the surface–subsurface flux expression are introduced. The proposed numerical model is verified and validated using benchmarks with reference solutions obtained in different codes as well as experimental results.

中文翻译：

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使用GeRa软件进行的表面-地下流动耦合建模

摘要

提出了用GeRa软件求解地表-地下耦合渗流的数学模型和数值方法。地表径流模型与地下流模型的耦合是使用一阶交换项完成的。本文解决了出现的非线性求解器收敛问题。为了克服这些问题，引入了处理表面-地下通量表达的方法。使用基准以及以不同代码获得的参考解决方案以及实验结果对所提出的数值模型进行了验证和验证。