Solute transport and geochemical modeling of the coastal quaternary aquifer, Delta Dahab Basin, South Sinai, Egypt

作     者：Amira Samy Mustafa Eissa Seham Shahen Moustafa M.Said Rabab M.Abou-shahaba Amira Samy;Mustafa Eissa;Seham Shahen;Moustafa M.Said;Rabab M.Abou-shahaba

作者机构：Division of Water Resources and Arid LandDepartment of HydrogeochemistryDesert Research CenterCairoEgypt Egypt Desalination Research Center of ExcellenceDesert Research CenterCairoEgypt Center for Water Supply StudiesS&E-Physical&Environmental SciencesTexas A&M University Corpus ChristiCorpus ChristiUSA Department of ChemistryFaculty of Science(Girls)Al-Azhar UniversityYousef Abbas StrNasr CityP.O.Box:11754CairoEgypt 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2024年第43卷第1期

页      面：16-39页

核心收录：

学科分类：070905[理学-第四纪地质学] 070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

主　　题：Groundwater geochemistry Seawater intrusion Solute transport SEAWAT 

摘      要：The wadi dahab delta is in a dry, arid coastal zone within Egypt’s south Sinai Peninsula’s eastern portion. The primary water source is the Quaternary coastal alluvial aquifer. The groundwater salinity varies from 890to 8213 mg/L, with a mean value of 3417 mg/L. The dissolved major ions have been used to calculate the seawater mixing index(SWMI) using a linear equation that discriminates the groundwater mostly affected by water–rock interaction(SWMI 1) and other samples mixed with Seawater(SWMI 1). The isotopic composition of groundwater for specifically chosen groundwater samples ranges from-0.645‰ to +5.212‰ for δ^(18)O and from-9.582‰ to + 22.778‰ for δ^(2)H, where the seawater represented by a Red Sea water sample(δ^(18)O + 1.64‰-δ^(2)H + 9.80‰) and reject brine water are considerably enriched the isotopic groundwater values. The geochemical NETPATH model constrained by the dissolved significant ions, isotopes, and the rock aquifer forming minerals as phases indicate the mixing percent with the seawater ranges from 9% to 97% of seawater from 91% to 3% of original recharge water. According to the SEAWAT 3-D flow models, seawater has penetrated the Northeastern Dahab delta aquifer, with the intrusion zone extending1500 m inland. The salt dissolution, upwelling of saline water, recharge from the upstream mountain block, and seawater encroachment are the primary aspects contributing to the deterioration of groundwater quality. These findings may have significance for effective groundwater withdrawal management in arid locations worldwide with similar hydrogeological systems.