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

doi:10.1007/s12665-022-10357-1

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

School of Natural and Built Environment

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	231
Number of pages	23
Journal	Environmental Earth Sciences
Volume	81
Issue number	8
DOIs	https://doi.org/10.1007/s12665-022-10357-1
Publication status	Published - Apr 2022

Keywords

Saline Intrusion, ERT, field study

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10.1007/s12665-022-10357-1Licence: CC BY

Characterizing groundwater salinity patterns in a coastal sand aquifer at Magilligan, Northern Ireland, using geophysical and geotechnical methods
Copyright 2022 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 8.1 MBLicence: CC BY

Characterising the hydrodynamic interactions due to natural and pumping-induced saltwater intrusion in a coastal aquifer
McDonnell, M. C. (Author), Hamill, G. (Supervisor) & Flynn, R. (Supervisor), Dec 2023
Student thesis: Doctoral Thesis › Doctor of Philosophy

Cite this

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

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 (",

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AU - Águila, Jesús F.

AU - McDonnell, Mark C.

AU - Flynn, Raymond

AU - Hamill, Gerard A.

AU - Ruffell, Alastair

AU - Benner, Eric M.

AU - Etsias, Georgios

AU - Donohue, Shane

PY - 2022/4

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N2 - 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 (

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

Abstract

Keywords

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Student theses

Characterising the hydrodynamic interactions due to natural and pumping-induced saltwater intrusion in a coastal aquifer

Cite this