Combining airborne thermal infrared images and radium isotopes to study submarine groundwater discharge along the French Mediterranean coastline

Bejannin, Simon, van Beek, Pieter, Stieglitz, Thomas, Souhaut, Marc, and Tamborski, Joseph (2017) Combining airborne thermal infrared images and radium isotopes to study submarine groundwater discharge along the French Mediterranean coastline. Journal of Hydrology, 13. pp. 72-90.

[img]
Preview
PDF (Published Version) - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (2MB) | Preview
View at Publisher Website: http://dx.doi.org/10.1016/j.ejrh.2017.08...
 
4
12


Abstract

The French Mediterranean coastline, which includes karstic springs discharging into coastal seas and coastal lagoons. Study focus We investigated submarine groundwater discharge (SGD), an important vector for many chemical elements that may impact the quality of the coastal environment. First, we acquired airborne thermal infrared (TIR) images to detect terrestrial groundwater inputs. Then we report in situ data (salinity; temperature; radium isotopes). We use these data i) to confirm the presence of groundwater discharge and to characterize the different systems, and ii) to quantify SGD fluxes and estimate the residence time of the water bodies. New hydrological insights for the region Few studies have been conducted on SGD along the French Mediterranean coastline. The terrestrial groundwater spring inputs in La Palme and Salses-Leucate coastal lagoons are in the range (0.04–0.11) m 3 s −1 , ≤ 2% of the local river inputs. In comparison, total SGD estimates to La Palme lagoon (0.56–1.7 m 3 s −1 ) suggest that the recirculation of lagoon water through the sediment is two orders of magnitude greater than the terrestrial groundwater inputs. At the Calanque of Port-Miou, the terrestrial groundwater flux to the coastal seas was between 0.6 and 1.2 m 3 s −1 in July 2009. This study demonstrates the application of airborne TIR remote sensing for detecting surficial groundwater springs, and the inability of the method to detect deeper, submerged springs.

Item ID: 52285
Item Type: Article (Research - C1)
ISSN: 0022-1694
Keywords: fluxes, GEOTRACES, Mediterranean sea, radium isotopes, submarine groundwater discharge, thermal infrared remote sensing
Additional Information:

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).

Funders: Fondation de Coopération Scientifique Sciences et Technologies pour l'Aéronautique et l'Espace, ANR-MED-SGD, CNES, French Agence National de Recherche, Labex OT-Med, Europe and Région Occitanie Pyrénées-Méditerranée
Projects and Grants: CYMENT, ANR-14-ACHN-0007-01, project medLOC, ANR-11-LABEX-0061
Date Deposited: 20 Feb 2018 03:50
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology @ 50%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology @ 50%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960903 Coastal and Estuarine Water Management @ 50%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 50%
Downloads: Total: 12
Last 12 Months: 3
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page