Prediction of Groundwater Pollution in Island Coastal Areas

Groundwater resources assessment is an important part of ecological construction and environmental assessment. At present, groundwater resources in many areas are polluted to varying degrees, especially Groundwater pollution in islands. This paper presents a simulation and prediction method of Groundwater pollution in island coastal areas based on GMS model. Firstly, through on-site investigation and data review, hydrogeological data of the study area were obtained, and a groundwater flow field model was established. The accuracy of the groundwater flow field model was verified by fitting the drilling water level with the simulated water level. Then, the leakage point and source intensity under abnormal conditions are set, and Groundwater pollution is predicted by numerical simulation using groundwater flow field model. The results show that, based on the lower limit of pollutant detection, the maximum diffusion distances of COD solutes from the source intensity center at the three leakage points are 362 m, 254 m, and 223 m, respectively, calculated based on the leakage of 1000 days. The maximum migration distances of petroleum solutes from the source intensity center at the three leakage points are 327 m, 223 m, and 214 m, respectively. The prediction results indicate that sewage leakage will have a certain degree of impact on groundwater, and due to coastal boundary limitations, the impact scope is only limited to the factory area and surrounding areas.