基于MARUN的海岸带地下水渗流及溶质运移过程研究进展

Research progress on coastal groundwater flow and solute transport processes based on MARUN

为定量研究海岸带众多非线性因素对含水层中地下水流-溶质运移过程的影响,MARUN(Marine Unsaturated)这款专门用于海岸带地下水数值模拟的软件被开发完成。从模型原理、算法特点、文献调研、案例分析等方面综述了MARUN的研究和应用进展。该软件适用于海岸带二维垂直剖面的地下水流及溶质运移反应的数值模拟。MARUN实现了变密度、变饱和度渗流与溶质运移的有限元算法,质量集中的隐式差分离散,以及Picard、Newton、Newton-Picard数值解法,涵盖了海潮海浪、蒸发降雨和荷载效应等众多非线性因素,具有专业性强、灵活性好、容错率高等特点,但没有可视化界面。MARUN已在原油污染的海滩生物修复、潮间带浅层含水层海水-地下水循环过程、区域地下水流系统的演化等场景中取得一批富有特色的研究成果。未来,MARUN需要进一步拓展到三维空间,耦合具有随机特征的物理化学过程,以提高对滨海含水层中地下水流与溶质运移过程的模拟仿真水平。

[Sgnificance]To quantitatively study the impact of various nonlinear factors in the coastal zone on groundwater flow and solute transport processes,MARUN(Marine Unsaturated)software for simulating groundwater flow in the coastal zone was developed.[Progress]This paper reviews the research and application progress of MARUN from the aspects of model principles,algorithm characteristics,literature review,and case analyses.The software is suitable for numerical simulations of two-dimensional vertical profiles of groundwater flow and solute transport reactions in the coastal zone.MARUN implements a finite element algorithm for variable saturation and density flow and solute transport,mass-consistent implicit difference discretization,and Picard,Newton,and Newton-Picard numerical solution methods,covering many nonlinear factors such as tides,waves,evaporation,rainfall,and load effects.It is characterized by its high professionalism,good flexibility,and high fault tolerance,but it does not have a graphical user interface.MARUN has achieved a number of highlighted research results in scenarios such as bioremediation of crude oil pollution on beaches,seawater-groundwater circulation processes in shallow aquifers in intertidal zones,and the evolution of regional groundwater flow systems.[Conclusion and Prospects]In the future,MARUN needs to be further expanded into three-dimensional space and coupled with physicochemical processes with random characteristics to improve its performance level of simulating groundwater flow and solute transport in coastal aquifers.