Recharge areas and geochemical evolution of groundwater in an alluvial aquifer system in the Sultanate of Oman

Publication Type  Journal Article
Year of Publication  2006
Authors  Matter, J. M.; Waber, H. N.; Loew, S.; Matter, A.
Journal Title  Hydrogeology Journal
Volume  14
Issue  1-2
Pages  203-224
Journal Date  Jan
ISBN Number  1431-2174
Accession Number  ISI:000234209500017
Key Words  arid regions; groundwater flow; groundwater recharge; hydrochemical modeling; stable isotopes; calcite; isotopes; carbon

A regional hydrogeochemical model was developed to evaluate the geochemical evolution of different groundwaters in an alluvial aquifer system in the Interior of Oman. In combination with environmental isotopes the model is able to extract qualitative and quantitative information about recharge, groundwater flow paths and hydraulic connections between different aquifers. The main source of water to the alluvial aquifer along the flow paths of Wadi Abyadh and Wadi M'uaydin in the piedmont is groundwater from the high-altitude areas of the Jabal Akhdar and local infiltration along the wadi channels. In contrast, the piedmont alluvial aquifer along Wadi Halfayn is primarily replenished by lateral recharge from the ophiolite foothills to the east besides smaller contributions from the Jabal Akhdar and local infiltration. Further down gradient in the Southern Alluvial Plain aquifer a significant source of recharge is direct infiltration of rain and surface runoff, originating from a moisture source that approaches Oman from the south. The model shows that the main geochemical evolution of the alluvial groundwaters occurs along the flow path from the piedmont to the Southern Alluvial Plain, where dedolomitization is responsible for the observed changes in the chemical and carbon isotope composition in these waters.


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URL  <Go to ISI>://000234209500017
DOI  DOI 10.1007/s10040-004-0425-2