[A-HW17] Near Surface Investigation and Modeling for Groundwater Resources Assessment and Conservation

[AHW17-02] Investigation of sustainable resource management of Taiwan Jiaoxi hot spring by integrating the hydrothermal numerical simulation in a heterogeneous hydrogeological model

*Ying-han Chen¹, Shih-Jung Wang¹ (1.National Central University)

Keywords:Taiwan Jiaoxi hot spring, Sustainable water resource management, Heterogeneous hydrogeological model, Markov chain, Groundwater flow simulation, Heat transfer simulation

In recent years, leisure activities have taken on an increasingly important role in the lives of the public, with hot spring resorts being among the popular choices for winter travel. With the rise of sustainability awareness, the development of tourism must simultaneously consider the sustainable utilization of hot springs. This study aims to evaluate the appropriate usage of the Jiaoxi hot spring in the Yilan County of Taiwan by integrating the hydro-thermal numerical simulation in a heterogeneous hydrogeological model. First, we collected the geological drilling data from various sources, as well as hydrological observation data including groundwater levels and temperatures from 25 monitoring wells in 2020, river level data, and pumping rates. We then used the Groundwater Modeling System (GMS) and employed the Markov chain to generate a heterogeneous hydrogeological model of sedimentary layers, which is then integrated with the homogeneous basement to create a three-dimensional geological model. Following this, the model is converted into a numerical groundwater flow model (MODFLOW) and combined with the MT3DMS package for hydro-thermal simulations to obtain the distribution of groundwater flow and temperature. The study successfully integrates the heterogeneous sedimentary layers with the homogeneous basement geological model, transforming it into a numerical groundwater flow model. The groundwater flow simulation demonstrates a remarkable consistency between simulated and observed data, indicating the model's representativeness. Further integration with the heat transfer model simulates the spatial distribution of temperature in the Jiaoxi area, with results comparable to current temperature observations. Future research will consider both groundwater quantity and temperature, aiming to further assess the appropriate pumping rates for the study area. The research framework established in this study provides a reference for water resource management in various hot spring regions, contributing to the realization of sustainable development goals for hot spring resources.