Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

A (Atmospheric and Hydrospheric Sciences ) » A-GE Geological & Soil Environment

[A-GE28] Energy-Environment-Water Nexus and Sustainable Development

Fri. May 26, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (6) (Online Poster)

convener:Ken Kawamoto(Graduate School of Science and Engineering, Saitama University), Yonghong Hao Hao(Tianjin Normal University), Jet-Chau Wen(National Yunlin University of Science and Technology), Wenke Wang(Changan University)

On-site poster schedule(2023/5/25 17:15-18:45)

10:45 AM - 12:15 PM

[AGE28-P01] A generalized analytical solution of groundwater head response to dual tide in a multi-layered island leaky aquifer system

*Zhi-Xue Zhao1, Yonghong Hao2, Tongke Wang1, Tian-Chyi Jim Yeh2,3 (1.College of Mathematical Science, Tianjin Normal University, Tianjin, China, 2.Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, China, 3.Department of Hydrology and Atmospheric Sciences, The University of Arizona, Tucson, USA)

Keywords:dual tide, groundwater, island aquifer, leakage, multilayer

The hydraulic properties of coastal aquifer systems are relevant to various hydrogeological, hydro-ecological and engineering problems. This study presents an analytical solution for predicting groundwater head fluctuations induced by dual-tide in multi-layered island aquifer systems, consisting of an unconfined aquifer on the top and any number of leaky aquifers below. The solution was derived via the methods of matrix differential calculus and separation of variables. It is more general than any existing analytical solutions for the tidal pressure propagation since the new solution can consider multi-layered aquifer systems along with the effects of leakage and aquifer length. Using this solution, we illustrated potential errors that may occur due to neglecting one or more vital factors affecting groundwater fluctuations. Besides, we articulated the groundwater response to the dual-tide in complex coastal aquifers. Considering that some thin semipermeable layers may be ignored in practical field investigation, we also demonstrated the effects due to simplification of aquifer layers. The results showed that with the increase in the number of overlapped leaky layers, the tidal propagation in the bottom part of multi-layered aquifer system approaches that in a single confined aquifer with the same transmissivity and storage.