污染物在受潮汐影响的地下水中输移的模拟

模拟沿海地区地下水及污染物的输移需要考虑海洋潮汐的影响,对于变密度污染物,考虑潮汐的影响会大大增加模型计算量,模拟此类问题要求模型具备优良的计算效果.为了获得适用于此类问题的模型,在比较各类模型的基础上,认为2DFEMFAT是合适的模型.对该模型作了修改完善,增加了潮汐模拟条件,使其能模拟潮汐影响下地下水中污染物的输移过程.为了验证修改后模型的正确性,作了潮汐条件下污染物输移的室内实验.数值模拟与实验数据的比较发 现,两者较为吻合,验证了模型的正确性和有效性.该模型可以推广应用到大尺度的实际问题.

Modeling of contaminant transport in groundwater with impact of tide

Effects of sea tide should be considered in modeling groundwater dynamics and associated contaminant transport in coastal aquifers, which may result in significant increase of computing time especially for variable-density contaminants, and superior numerical performance of the model is required. In order to simulate this problem, suggestion is presented in this paper that 2DFEMFAT may be the appropriate models based on comparisons with other similar models. Modifications to 2DFEMFAT were done to make it capable of simulating contaminant transport in a tidally affected groundwater system. In order to verify the model, laboratory experiments were performed for contaminant transport under tidal conditions. The validation and capability of the modified code are demonstrated by a satisfying agreement between numerical results and experimental ones. The reported model may be suitable for applications to field case problems with large dimensions.