Assessment of groundwater discharge pathways in a till-dominated coastal aquifer
Study region: Mabou Harbour located in Cape Breton Island, Nova Scotia, Canada, is representative of the many natural harbours throughout the Maritime region of Canada as the surrounding landscape is overlain by glacial deposits, predominantly composed of glacial till. Study focus: Understanding the...
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ftdoajarticles:oai:doaj.org/article:fe9e2311ac474d9593bd6b8adb121571 2023-05-15T15:46:47+02:00 Assessment of groundwater discharge pathways in a till-dominated coastal aquifer Raymond D. Craddock Gavin W. Kennedy Rob C. Jamieson Jonathan Keizer Aaron A. Mohammed Barret L. Kurylyk 2022-12-01T00:00:00Z https://doi.org/10.1016/j.ejrh.2022.101205 https://doaj.org/article/fe9e2311ac474d9593bd6b8adb121571 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S221458182200218X https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2022.101205 https://doaj.org/article/fe9e2311ac474d9593bd6b8adb121571 Journal of Hydrology: Regional Studies, Vol 44, Iss , Pp 101205- (2022) Groundwater flow modelling Submarine groundwater discharge Groundwater-surface water interactions Coastal hydrogeology Groundwater pathways Physical geography GB3-5030 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.1016/j.ejrh.2022.101205 2022-12-30T21:07:30Z Study region: Mabou Harbour located in Cape Breton Island, Nova Scotia, Canada, is representative of the many natural harbours throughout the Maritime region of Canada as the surrounding landscape is overlain by glacial deposits, predominantly composed of glacial till. Study focus: Understanding the pathways facilitating groundwater flow and associated solute transport to the ocean is key for developing conceptual hydrogeologic models for coastal watersheds and for informing coastal zone management. Most local-scale field and modelling submarine groundwater discharge (SGD) studies have been conducted in high-permeability formations given the likely importance of SGD in these coastal settings. This study investigates direct (SGD) and indirect (seaward stream baseflow) groundwater discharge from a till dominated coastal aquifer using a combination of field measurements (river flow and baseflow separation, seepage meter measurements, and water temperature analysis) and a calibrated 3D numerical groundwater flow model. New hydrological insights for the region: Results show that seaward stream baseflow greatly exceeds direct SGD to the ocean on the scale of the full harbour watershed (96.1% vs. 3.9 of total groundwater discharge). Particle tracking shows that the vast majority of SGD originates in the subcatchment immediately surrounding the harbour with limited intermediate or regional flow. The shorter flow paths and residence times for direct SGD results in less opportunity for natural attenuation processes and may have implications for groundwater-borne contamination to this harbour. Article in Journal/Newspaper Breton Island Directory of Open Access Journals: DOAJ Articles Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Canada Journal of Hydrology: Regional Studies 44 101205 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Groundwater flow modelling Submarine groundwater discharge Groundwater-surface water interactions Coastal hydrogeology Groundwater pathways Physical geography GB3-5030 Geology QE1-996.5 |
spellingShingle |
Groundwater flow modelling Submarine groundwater discharge Groundwater-surface water interactions Coastal hydrogeology Groundwater pathways Physical geography GB3-5030 Geology QE1-996.5 Raymond D. Craddock Gavin W. Kennedy Rob C. Jamieson Jonathan Keizer Aaron A. Mohammed Barret L. Kurylyk Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
topic_facet |
Groundwater flow modelling Submarine groundwater discharge Groundwater-surface water interactions Coastal hydrogeology Groundwater pathways Physical geography GB3-5030 Geology QE1-996.5 |
description |
Study region: Mabou Harbour located in Cape Breton Island, Nova Scotia, Canada, is representative of the many natural harbours throughout the Maritime region of Canada as the surrounding landscape is overlain by glacial deposits, predominantly composed of glacial till. Study focus: Understanding the pathways facilitating groundwater flow and associated solute transport to the ocean is key for developing conceptual hydrogeologic models for coastal watersheds and for informing coastal zone management. Most local-scale field and modelling submarine groundwater discharge (SGD) studies have been conducted in high-permeability formations given the likely importance of SGD in these coastal settings. This study investigates direct (SGD) and indirect (seaward stream baseflow) groundwater discharge from a till dominated coastal aquifer using a combination of field measurements (river flow and baseflow separation, seepage meter measurements, and water temperature analysis) and a calibrated 3D numerical groundwater flow model. New hydrological insights for the region: Results show that seaward stream baseflow greatly exceeds direct SGD to the ocean on the scale of the full harbour watershed (96.1% vs. 3.9 of total groundwater discharge). Particle tracking shows that the vast majority of SGD originates in the subcatchment immediately surrounding the harbour with limited intermediate or regional flow. The shorter flow paths and residence times for direct SGD results in less opportunity for natural attenuation processes and may have implications for groundwater-borne contamination to this harbour. |
format |
Article in Journal/Newspaper |
author |
Raymond D. Craddock Gavin W. Kennedy Rob C. Jamieson Jonathan Keizer Aaron A. Mohammed Barret L. Kurylyk |
author_facet |
Raymond D. Craddock Gavin W. Kennedy Rob C. Jamieson Jonathan Keizer Aaron A. Mohammed Barret L. Kurylyk |
author_sort |
Raymond D. Craddock |
title |
Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
title_short |
Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
title_full |
Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
title_fullStr |
Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
title_full_unstemmed |
Assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
title_sort |
assessment of groundwater discharge pathways in a till-dominated coastal aquifer |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://doi.org/10.1016/j.ejrh.2022.101205 https://doaj.org/article/fe9e2311ac474d9593bd6b8adb121571 |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) |
geographic |
Breton Island Canada |
geographic_facet |
Breton Island Canada |
genre |
Breton Island |
genre_facet |
Breton Island |
op_source |
Journal of Hydrology: Regional Studies, Vol 44, Iss , Pp 101205- (2022) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S221458182200218X https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2022.101205 https://doaj.org/article/fe9e2311ac474d9593bd6b8adb121571 |
op_doi |
https://doi.org/10.1016/j.ejrh.2022.101205 |
container_title |
Journal of Hydrology: Regional Studies |
container_volume |
44 |
container_start_page |
101205 |
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1766381499005796352 |