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Accueil du site → Master → Israel → The eco-hydrology of the cross-border As Samen-Hebron Basin : the chemical transformation of pollutants along the As Samen-Hebron stream and aquifer system in Israel and Palestine

Ben-Gurion University of the Negev (2015)

The eco-hydrology of the cross-border As Samen-Hebron Basin : the chemical transformation of pollutants along the As Samen-Hebron stream and aquifer system in Israel and Palestine

Hashweh, Layla

Titre : The eco-hydrology of the cross-border As Samen-Hebron Basin : the chemical transformation of pollutants along the As Samen-Hebron stream and aquifer system in Israel and Palestine

Auteur : Hashweh, Layla

Etablissement de soutenance : Ben-Gurion University of the Negev

Grade : Master of Science (MS) 2015

Résumé partiel
The aim of this thesis is to observe and analyze the hydraulic connectivity between polluted stream water and a local aquifer in view of the chemical evolution of pollutants along the Hebron Beer-Sheva Stream, a cross-border hydrological basin shared by Israel and the Palestinian Territories. The stream, as an ephemeral wash, has turned into a perennial, polluted stream carrying wastewater effluent all year round. This study analyzes the pathway of pollutants along the groundwater streamlines, due to possible stream-groundwater connectivity. This analysis was carried out by monitoring the quality of both surface and groundwater in predetermined sampling sites for each. A common GIS map was used for the different wells existing in the basin. Selected hydrochemical parameters were gathered in a common database for the wells. The connectivity between the pollutant and contaminant sources and the aquifer was established and quantified by using a cluster analysis followed by a mixing-cell modeling approach. To this end, the modelled aquifer was subdivided into mixing cell compartments based on hydrochemical similarities. An SPSS cluster analysis was used to create groups of water bodies based on similar hydrochemical parameters. The actual fluxes of pollutants were assessed by using a multi-variable mixing-cell approach. The mixing-single-cell model was used to identify and assess the relative contribution from active sources of recharge and active sources of pollution to each cell. The results confirm and support the hypothesis that there is hydraulic connectivity between the As Samen Stream and the groundwater in the upper Hebron basin. The pollution is evident in both the upper and lower sub-aquifer units. The pollutants’ migration paths were identified as the pollutants migrate to the southwest, west and later toward the north side of the southern basin following the groundwater streamlines in he basin. The eastern streamlines in the As Samen Wadi catchment are more polluted than those on the western side due to possible massive mixing and dilution along the western groundwater streamlines. The pollution of wells is evident in the southern part of the basin and even extends outside the basin to the northwestern borders of the catchment, reconfirming water infiltration from the stream to the groundwater.

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Page publiée le 12 janvier 2022