This seminar is part of the Tuesday Seminar Series organized by the Center for Hydrogeology and Geothermics (CHYN) at the University of Neuchâtel. We are pleased to welcome Satoshi Tajima from the University of Neuchâtel (UniNe), who will discuss the interplay between short- and long-term processes in coastal aquifers, focusing on the impacts of storm surges, tides, and climate change on groundwater salinity and mixing dynamics.

Abstract
Coastal aquifers are characterised by the interactions between groundwater and seawater across diverse time scales. A key question is how short-term sea-level changes, such as storm surges and tides, influence long-term salinity patterns, and how long-term climate change, in turn, affects the short-term dynamics. This talk explores the question through the lens of recent numerical modelling studies. Two key topics will be discussed: (1) the impacts of storm surges on low-lying islands under climate change, and (2) the role of tidal forcing in driving complex, chaotic mixing. The talk concludes by emphasising the interplay between short-term and long-term processes, and their implications for managing and securing groundwater resources in coastal aquifers.