Research on the numerical simulation of the groundwater flow field in bedrock islands

The island is an important part of our territory, and it is of great significance to our national security and national defense. Groundwater resources in islands are particularly valuable. Simulation of the groundwater flow field is an important method to study the distribution of groundwater. Due to the flexible hydrogeological condition of islands and a small number of observation wells, the accuracy of hydrogeological model generalization was not high and the initial conditions were difficult to obtain. In order to overcome these difficulties of the groundwater flow field simulation in bedrock islands, the authors chose Wailingding Island in Zhuhai as a study case to build the geological model of island using the digital elevation model data. The geological layers data of the island were acquired thraugh GPR method, DC method and hydrogeological means. The initial water level of the groundwater was determined to build the groundwater flow field model by remote sensing elevation and well data. Finally, the groundwater flow images of simulation results were mapped through the numerical simulation of groundwater flow of Wailingding Island. The actual water levels of the measured multiple points were well correlated with the simulated water levels, with R² of 0.872 2. It can be seen that using integrated remote sensing, geophysical prospecting, hydrogeological means and other methods and technologies to obtain data, and using the methods of simulation softwares or programs to simulate data, were effective research methods in the field of island groundwater resource.