Characterizing groundwater salinity patterns in a coastal sand aquifer at Magilligan, Northern Ireland, using geophysical and geotechnical methods

Jesús F. Águila*, Mark C. McDonnell, Raymond Flynn, Gerard A. Hamill, Alastair Ruffell, Eric M. Benner, Georgios Etsias, Shane Donohue

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
122 Downloads (Pure)

Abstract

Tidal forcing influences groundwater flow and salt distribution in shallow coastal aquifers, with the interaction between sea level variations and geology proving fundamental for assessing the risk of seawater intrusion (SI). Constraining the relative importance of each is often confounded by the influences of groundwater abstraction and geological heterogeneity, with understanding of the latter often restricted by sampling point availability and poor spatial resolution. This paper describes the application of geophysical and geotechnical methods to better characterize groundwater salinity patterns in a tidally dominated ~ 20 m thick sequence of beach sand, unaffected by groundwater abstraction. Electrical resistivity tomography (ERT) revealed the deposit to consist of an upper wedge of low resistivity (
Original languageEnglish
Article number231
Number of pages23
JournalEnvironmental Earth Sciences
Volume81
Issue number8
DOIs
Publication statusPublished - Apr 2022

Keywords

  • Saline Intrusion, ERT, field study

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