Heterogeneity Hydrogeology for Artificial Islands: Tidal Fluctuation and Groundwater Response.

This research focuses on the estimation of the heterogeneous aquifer for artificial islands by using the numerical modeling. The study area of this experiment is located in the Sixth Naphtha Cracker Plant, which is beside the estuary of the Jhuoshuei River in the western parts of Taiwan. The island is approximately 22.55 Square kilometers and although, the geology is consisted mostly of sandy soil, the hydraulic conductivity is heterogeneous based on the slug test results. Due to the fact that the study area is an island, the groundwater level is affected by the sea tidal; therefore, 10 observation wells for monitoring the groundwater level have been set and the observation frequency has been taken hourly for a period of seven months. In addition to that, for estimating the heterogeneity hydrogeology distribution field on artificial islands, the technique of inversing and verifying the Virtual Experimental Field (VEF) of the heterogeneity hydrogeology distribution field by using the Monte Carlo method is applied. To complete the experiment, the inverse technique in the study area of the heterogeneity hydrogeology distribution field is followed under the same methods. The purpose of this study is to introduce and estimate the heterogeneous unconfined aquifer for artificial islands, based on the groundwater response to the tidal fluctuation.