Coupling isotope hydrology, geochemical tracers and emerging compounds to evaluate mixing processes and groundwater dependence of a highly anthropized coastal hydrosystem

JOURNAL OF HYDROLOGY

卷:578

Article

Erostate, M.^1,2  Huneau, F.^1,2  Garel, E.^1,2  Vystavna, Y.³  Santoni, S.^1,2  Pasqualini, V.² 

[1] Univ Corse Pascal Paoli, Fac Sci & Tech, Dept Hydrogeol, Campus Grimaldi,BP 52, F-20250 Corte, France

[2] CNRS, UMR 6134, SPE, F-20250 Corte, France

[3] Acad Sci Czech Republ, Biol Ctr, Inst Hydrobiol, Na Sadkach 7, Ceske Budejovice 37005, Czech Republic

关键词: Aquifer;    Lagoon;    Water residence time;    Water mixing;    Groundwater dependent ecosystem;    Corsica;   

DOI  :  10.1016/j.jhydrol.2019.123979

来源: Elsevier

【 摘 要 】

Coastal aquifers can be considered as an important socio-economic and ecological component worldwide. The implementation of sustainable groundwater management is made difficult by complex hydrological behaviors due to many interactions between groundwater and fresh, brackish and salt surface water. This study proposes an original multi-tracer approach including physico-chemical parameters, trace elements, O-18, H-2, H-3 of the water molecule and emerging organic compounds (EOCs) in order to improve the understanding of strongly urbanized coastal aquifers. This methodology was applied to a Mediterranean coastal aquifer in northern Corsica (France). Firstly, the isotopic data allow highlighting the complex recharge of groundwater, provided by both allochthonous rainfall from the mountain and autochthonous rainfall on the Marana-Casinca alluvial plain. Secondly, geochemical data coupled with isotopic signatures allow the identification of the different contributors and the quantification of the mixing processes into the aquifer. The residence time of groundwater were estimated with H-3. In addition, to display inertial areas with long residence time, H-3 also highlights areas subject to infiltration of recent water. A better understanding of short-time hydrological processes was improved by EOCs. The study of the fate of EOCs in the environment provided a higher level of resolution than geochemical and isotopic tracers alone. Thus, the multi-tracing approach using isotopic and geochemical data, coupled with the study of the fate of EOCs, made possible to specify the conceptual model in highly anthropized hydrosystems, and particularly fast hydrological processes.

【 授权许可】

Free