TY - JOUR
T1 - Field evidence of swash groundwater circulation in the microtidal rousty beach, France
AU - Sous, Damien
AU - Petitjean, Lise
AU - Bouchette, Frédéric
AU - Rey, Vincent
AU - Meulé, Samuel
AU - Sabatier, Francois
AU - Martins, Kévin
PY - 2016/11
Y1 - 2016/11
N2 - This manuscript reports on a novel field experiment carried out on a microtidal beach in Camargue, France. For the first time in the field, a comprehensive description of the groundwater dynamics under sandy beach swash zone is presented. A cross-shore network of 15 buried pressure sensors is combined with terrestrial LiDAR measurements to study the swash-groundwater dynamics. The presented data focus on the decay of a moderate storm which allows to monitor the evolution of the groundwater pressure field in response to the retreat of the swash zone. Both horizontal and vertical head gradients are measured within the porous sand soil to estimate the groundwater flow field using Darcy's law. Time-averaged analysis demonstrates the presence of a rather consistent groundwater circulation pattern under the swash zone, shifting offshore with the swash zone. The main tendency is an offshore directed flow, with infiltration/exfiltration in the upper/lower parts of the swash zone. Time-resolved analysis highlights the typical groundwater response to swash events which consists mainly of an overall infiltration flow during the bed inundation by the swash tongue, a seaward flow during the swash retreat and, for long backwash events, a localized exfiltration flow under the next incoming uprush.
AB - This manuscript reports on a novel field experiment carried out on a microtidal beach in Camargue, France. For the first time in the field, a comprehensive description of the groundwater dynamics under sandy beach swash zone is presented. A cross-shore network of 15 buried pressure sensors is combined with terrestrial LiDAR measurements to study the swash-groundwater dynamics. The presented data focus on the decay of a moderate storm which allows to monitor the evolution of the groundwater pressure field in response to the retreat of the swash zone. Both horizontal and vertical head gradients are measured within the porous sand soil to estimate the groundwater flow field using Darcy's law. Time-averaged analysis demonstrates the presence of a rather consistent groundwater circulation pattern under the swash zone, shifting offshore with the swash zone. The main tendency is an offshore directed flow, with infiltration/exfiltration in the upper/lower parts of the swash zone. Time-resolved analysis highlights the typical groundwater response to swash events which consists mainly of an overall infiltration flow during the bed inundation by the swash tongue, a seaward flow during the swash retreat and, for long backwash events, a localized exfiltration flow under the next incoming uprush.
KW - Groundwater circulation
KW - Porous media
KW - Sand beach
KW - Swash zone
UR - http://www.scopus.com/inward/record.url?scp=84988494043&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/j.advwatres.2016.09.009
U2 - 10.1016/j.advwatres.2016.09.009
DO - 10.1016/j.advwatres.2016.09.009
M3 - Article
AN - SCOPUS:84988494043
SN - 0309-1708
VL - 97
SP - 144
EP - 155
JO - Advances in Water Resources
JF - Advances in Water Resources
ER -