Two-dimensional groundwater flow caused by spatially varied surface water recharge

Groundwater is widely used in agricultural irrigation, aquaculture and people's livelihoods in the western region of Taiwan. The main storage area of groundwater is located in the south-central part of Taiwan because the aquifer mostly under the alluvial plain is thick and suitable for water storage. However, due to the uneven spatial and temporal distribution of surface water and the impact of surface coverage, the impact on groundwater is more complicated. To explore the influence of surface water on groundwater flow in the western plain of Taiwan, a mathematical model of analytical solutions to the two-dimensional linearized Boussinesq equation is established by using an analytical approach. Groundwater flow simulations can be performed by inputting the surface water information and local geologic parameters, and it is expected to verify the model through the measured groundwater information.

This study intends to analyze the change of groundwater flow in unconfined aquifers with horizontal bases under different spatially varied surface water recharge rates. After the two-dimensional groundwater model is developed and verified, it can be used to predict the groundwater flow under any spatially varied surface recharge rates.