Coastal groundwater salinization: Focus on the vertical variability in a multi-layered aquifer through a multi-isotope fingerprinting (Roussillon Basin, France)

Using stable water isotopes to identify spatio-temporal controls on groundwater recharge in two contrasting East African aquifer systems

“…This is consistent with the scenario reported by others (e.g. Schmidt et al 2011, Petelet-Giraud et al 2016 in their study of monitored wells in the Roussillon Basin, France. Such similarities can be used in advising water authorities operating along coastlines anywhere in the world in planning their abstraction and monitoring networks.…”

Freshening of a Coastal Karst Aquifer Revealed by the Temporal Changes in a Spring Water Composition (La Palme, Southern France)

“…Monitoring the spring water composition at a higher frequency is thus needed in order to constrain the response of the aquifer to rainfall. At a larger regional scale, Petelet-Giraud et al [44] have shown that the Roussillon sedimentary basin (about 30 km south of the La Palme watershed) is a complex multi-layer aquifer whose layers are not equally affected by salinization, with contributions of waters of different origins (fresh water, modern seawater, paleo-groundwaters) and different residence times. The La Clape massif (~30 km northeast of La Palme Lagoon) is a coastal limestone formation whose waters have been characterized as mixtures of local recharge waters with saline waters, either modern seawater or paleo-groundwater [7].…”

Natural and Anthropogenic Groundwater Contamination in a Coastal Volcanic-Sedimentary Aquifer: The Case of the Archaeological Site of Cumae (Phlegraean Fields, Southern Italy)

“…However, the identification of pollution sources is not an easy task because of the presence of: (1) more than one source, (2) point and diffuse sources and (3) several biogeochemical processes which can alter contaminant concentration [25]. The management of water resources in a coastal area requires an accurate characterization of aquifers' recharge, groundwater pathways and identification of groundwater contamination sources which can be effectively carried out by an integrated hydrogeological, hydrostratigraphical, hydrochemical and isotopic assessment [26][27][28][29]. In many cases, the use of stable isotopes of elements allows the identification of sources characterized by different isotopic compositions [14,[30][31][32][33][34].…”

“…In many cases, the use of stable isotopes of elements allows the identification of sources characterized by different isotopic compositions [14,[30][31][32][33][34]. In particular, the measurement of natural and anthropogenic isotopic tracers can provide information about groundwater recharge and mixing (δD and δ 18 O) [35][36][37][38], help identify groundwater hydro-facies and seawater intrusion (major ions and trace elements) [27,[39][40][41], can give information about the upwelling of mineralized fluids as well as aquifers' homogeneity ( 222 Rn, δ 11 B) [42][43][44][45] and identify nitrate pollution sources (δ 15 N and δ 18 O of nitrates, δ 11 B) [25,34,[46][47][48].…”