Rainfall infiltration-induced groundwater table rise in an unsaturated porous medium
Rainfall infiltration-induced groundwater table rise in an unsaturated porous medium
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DOI：
10.1007/s12665-015-4890-9
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发表时间：
2016-01
影响因子：
2.8
通讯作者：
Lizhou Wu;A. Selvadurai
中科院分区：
文献类型：
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作者：
Lizhou Wu;A. Selvadurai
与气候变化相关的降雨量增加正在成为一种常见现象，并可能导致各种地质环境危害。降雨过程中的渗透和土体的变形是耦合的，在这些事件中，地下水位很容易上升。耦合过程的研究是重要的，以增加我们的知识，水位上升对环境的影响。基于多孔介质中的渗流和流动理论、弹性理论和土-水特征曲线，开发了非饱和多孔介质的二维流体力学模型，并将其纳入COMSOL Multiphysics®软件。该方法能够考虑土水特征曲线的影响。研究了边界条件的变化对非饱和渗流与变形耦合方程的影响。算例表明，耦合效应对地下水位的位置有显著影响。在非饱和多孔介质中，地下水位的变化速率与渗透和变形的耦合密切相关。
Increased rainfall associated with climate change is becoming a common occurrence and can lead to a variety of geoenvironmental hazards. Infiltration during rainfall and deformations of a soil mass are coupled, and the water table can easily experience a rise during these events. A study of the coupling process is important to increase our knowledge concerning the impact of a water level rise on the environment. Based on the theory of seepage and flow in porous media, the theory of elasticity and the soil–water characteristic curve, a two-dimensional hydro-mechanical model for an unsaturated porous medium is developed and incorporated in the COMSOL Multiphysics®software. The numerical procedure is capable of considering the influences of the soil–water characteristic curve. The effects of varying the boundary conditions on the coupled unsaturated infiltration and deformation equations are investigated. The examples demonstrate that the coupling effects significantly influence the position of the groundwater levels. The rate of change in the water table is closely related to the coupled infiltration and deformation in an unsaturated porous medium.