@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00799612v1> a dcat:Dataset ;
    dct:description """
              The Rhône delta, South of France (Camargue, 750 km2) is a coastal saline wetland located along the Mediterranean Sea. The confined aquifer of this delta shows high values of electrical conductivity rising from the north (4 mS/cm) to the shoreline (58 mS/cm). This work aims to identify the origin of groundwater salinity and the geochemical processes occurring in this coastal confined aquifer according to the degree of salinity. A natural tracing approach is considered using monthly sampling in 8 piezometers for chemical and isotopic analyses (18O, 2H, 13CTDIC). Ionic and isotopic ratios demonstrate that strong salinities are due to a simple mixing between Mediterranean seawater and freshwater; seawater contribution reaches up to 98% at 8 km from the shoreline. Seawater intrusion induces a particular groundwater chemistry which varies with the degree of seawater contribution: (1) In the less saline part of the aquifer (seawater contribution <20%), the intrusion induces an increase of Na+ in groundwater leading to Ca2+/Na+ exchange processes. The δ13CTDIC analyses show that matrix exchange processes most likely occur for the less saline samples. (2) In the saline part of the aquifer (seawater contribution >20%), the intrusion induces SO4 reduction which is confirmed by highly depleted δ13CTDIC values (up to −19‰). The δ13CTDIC also reveals that methanogenesis processes may occur in the most reductive part of the aquifer. Due to SO4 reduction, the intrusion induces a shift in carbonate equilibrium leading to supersaturation with respect to dolomite and/or magnesian calcite. Thus carbonate precipitation may occur in the area strongly influenced by seawater.
            """ ;
    dct:identifier "hal-00799612" ;
    dct:issued "2026-05-12T23:30:00.203627"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-12T23:30:00.203642"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Origin of groundwater salinity and hydrogeochemical processes in a confined coastal aquifer: Case of the Rhone delta (Southern France)" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00799612v1/resource/ee328507-559f-4a8b-8ae7-2f3de92cd241> ;
    dcat:keyword "coastal-aquifer",
        "electrical-conductivity",
        "geochemistry",
        "geochimie",
        "groundwater",
        "infoeu-reposemanticsarticle",
        "journal-articles",
        "salinity",
        "sdemcgenvironmental-sciencesglobal-changes",
        "sduenvisciences-of-the-universe-physicscontinental-interfaces-environment" ;
    dcat:landingPage <ISSN:%200883-2927> .

<ISSN:%200883-2927> a foaf:Document .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00799612v1/resource/ee328507-559f-4a8b-8ae7-2f3de92cd241> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-12T23:30:00.211802"^^xsd:dateTime ;
    dct:modified "2026-05-12T23:30:00.159193"^^xsd:dateTime ;
    dct:title "Origin of groundwater salinity and hydrogeochemical processes in a confined coastal aquifer: Case of the Rhone delta (Southern France)" ;
    dcat:accessURL <https://hal.science/hal-00799612> .

<https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> a foaf:Agent ;
    foaf:name "test_moissonnage_selune" .