<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Lamine Boumaiza a,⁎, Romain Chesnaux a, Tarek Drias b, Julien Walter a, Frédéric Huneau c,d, Emilie Garel c,d, Kay Knoeller e, C</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Identifying groundwater degradation sources in a Mediterranean coastalarea experiencing significant multi-origin stresses</style></title><secondary-title><style face="normal" font="default" size="100%">Science of the Total Environment</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">www.elsevier.com/locate/scitotenv</style></url></web-urls></urls><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;
	Abstract
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&lt;p&gt;
	This study investigates the multiple contamination sources of a coastal Mediterranean aquifer in northeastern&lt;br&gt;Algeria that is bordered by two rivers and neighboring densely populated areas. Hydrogeochemical and isotopic&lt;br&gt;groundwater characterization is carried out, including the analyses of major elements, water stable isotopes δ2HH2O&lt;br&gt;and δ18O-H2O, and stable isotopes of nitrate δ15N-NO3 and δ18O-NO3, and then integrated into the history of&lt;br&gt;land use over the study area. Groundwater nitrate concentrations ranging from 1.6 to 235 mg/L with a median&lt;br&gt;value of 69 mg/L are evidence of the degradation of groundwater quality induced by anthropogenic sources.&lt;br&gt;The combined of δ15N-NO3 and δ18O-NO3 ratios showed that nitrate in groundwater is attributable to (i) the uncontrolled&lt;br&gt;development of inadequate private sanitation systems over the study area, and (ii) the unsafe application&lt;br&gt;of animal manure to fertilize crops. Very active saltwater intrusion is confirmed by several&lt;br&gt;hydrogeochemical indicators. Interestingly, the intrusion mechanism appears to be more complex than a direct&lt;br&gt;intrusion fromtheMediterranean Sea. During the high-water period, saltwater intrusion may also originate from&lt;br&gt;the two rivers bordering the aquifer, via upstream migration of seawater through the river mouths. The heavier&lt;br&gt;ratios in δ2H-H2O and δ18O-H2O of surface water collected from the rivers suggest that water from the Mediterranean&lt;br&gt;Sea is mixingwithwater in the rivers.Multi-source contamination not only contributes to complex chemical&lt;br&gt;reactionswithin the aquifer, but also contributes, via the cumulative effect of the various sources, to affecting&amp;nbsp;large parts of the study area. The present study may serve as a warning to the effect that historical land-use practices&lt;br&gt;may exert seriously deleterious impacts on groundwater quality and greatly limit conditions for the sustainable&lt;br&gt;management of Mediterranean coastal areas.
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