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Coupling isotopic and piezometric data to infer groundwater recharge mechanisms in arid areas: example of Samail Catchment, Oman

Abdalla, Osman A. E. ; Al-Hosni, Talal ; Al-Rawahi, Abdullah ; Kacimov, Anvar ; Clark, Ian

Hydrogeology journal, 2018-12, Vol.26 (8), p.2561-2573 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Coupling isotopic and piezometric data to infer groundwater recharge mechanisms in arid areas: example of Samail Catchment, Oman
Autor: Abdalla, Osman A. E. ; Al-Hosni, Talal ; Al-Rawahi, Abdullah ; Kacimov, Anvar ; Clark, Ian
Assuntos: Alluvial deposits ; Alluvium ; Annual rainfall ; Aquatic Pollution ; Aquifers ; Arid regions ; Carbon 14 ; Catchment area ; Catchments ; Coastal aquifers in the Middle East and North Africa region ; Dating techniques ; Downstream ; Downstream effects ; Earth and Environmental Science ; Earth Sciences ; Enrichment ; Evaporation ; Evaporation effects ; Fractures ; Geology ; Geophysics/Geodesy ; Groundwater ; Groundwater flow ; Groundwater recharge ; High altitude ; Homogeneity ; Hydrochemistry ; Hydrogeology ; Hydrographs ; Hydrologic data ; Hydrology ; Hydrology/Water Resources ; Isotopes ; Littoral environments ; Mean annual precipitation ; Mountains ; Ophiolites ; Piezometers ; Quaternary ; Rain ; Regional analysis ; Strontium 87 ; Strontium isotopes ; Waste Water Technology ; Water Management ; Water Pollution Control ; Water Quality/Water Pollution ; Water springs ; Well hydrographs
É parte de: Hydrogeology journal, 2018-12, Vol.26 (8), p.2561-2573
Descrição: Hydrochemistry and well hydrographs are coupled to assess groundwater recharge in the regional catchment of Samail, Oman. The complex geology comprises three aquifers: limestones of the Hajar Supergroup (HSG) at the highlands of North Oman Mountains (NOM); fractured/weathered ophiolites; and Quaternary alluvium. Groundwater flows south–north from the NOM to the coast. Samples from groundwater wells and springs (38) were analyzed for isotopes and major ions. Corrected 14 C dating reveals modern groundwater across the entire catchment, while 87 Sr/ 86 Sr (0.70810–0.70895) shows greater homogeneity. Groundwater in the upper catchment is depleted in 2 H and 18 O, indicating a high-altitude recharge source (NOM), and becomes enriched downstream, with a slope indicating an evaporation effect. The hydrographs of nested piezometers located in the upper, middle and lower catchment show different recharge responses between deep and shallower depths. Head difference in response to recharge is observed upstream, suggesting a lateral recharge mechanism, contrary to vertical recharge downstream reflected in identical recharge responses. The homogeneous 87 Sr/ 86 Sr ratio, head changes, downstream enrichment of 2 H and 18 O, and the presence of modern groundwater throughout the catchment suggest that groundwater recharge takes place across the entire catchment and that the three aquifers are hydraulically connected. The recharge estimated using the chloride mass balance method is in the range of 0–43% of the mean annual rainfall.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Coupling isotopic and piezometric data to infer groundwater recharge mechanisms in arid areas: example of Samail Catchment, Oman

Abdalla, Osman A. E. ; Al-Hosni, Talal ; Al-Rawahi, Abdullah ; Kacimov, Anvar ; Clark, Ian

Berlin/Heidelberg: Springer Berlin Heidelberg

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