[A-HW25] Near Surface Investigation and Modeling for Groundwater Resources Assessment and Conservation

[AHW25-P03] Investigation of Submarine Groundwater Discharge (SGD) Using Global Meteorological Reanalysis Data for Sustainable Water Resources

*Tsai-Tung Hou¹, Yi-Yun Lu¹, Yuan-Chien Lin¹ (1.Department of Civil Engineering, National Central University)

Keywords:Submarine Groundwater Discharge, groundwater, water resources management

In recent years, climate change has altered rainfall patterns both temporally and spatially, increasing the frequency of extreme events such as floods and droughts. These challenges are expected to intensify, making efficient water resource allocation and the identification of alternative sources increasingly critical. One such source is Submarine Groundwater Discharge (SGD), through which significant volumes of fresh groundwater enter the ocean.

This study integrates hydrological knowledge with global meteorological reanalysis data, including Sea Surface Salinity (SSS) from Soil Moisture Active Passive (SMAP), Sea Surface Temperature (SST), and chlorophyll concentration from Aqua-MODIS. Using statistical techniques such as Wavelet Analysis and Empirical Orthogonal Function (EOF), we analyze the spatiotemporal characteristics of meteorological variables and identify potential SGD regions. By integrating local rainfall, surface runoff, and groundwater spatiotemporal data analysis with the detection of low-salinity SGD areas, we propose two key benefits: (1) utilizing SGD for desalination to reduce brine concentration and mitigate marine pollution risks, and (2) leveraging SGD data to improve water resource management and planning.