• B.Sc in Geology, King Saud University, Riyadh, KSA, 2003.
• M.Sc in Hydrogeology, King Saud University, Riyadh, KSA, 2012. (Evaluation of Waste Water Effects on Ground Water Systems in Mulaylih Area in Al Madinah Using Major and Trace Elements).
• Evaluation of Waste Water Effects on Ground Water Systems in Mulaylih Area in Al Madinah Using Major and Trace Elements. M.Sc theses. 2012.
• Loni, O., Zaidi, F., Alhumimidi, M., Alharbi, O., Hussein, M., Dafalla, M., AlYousef, K., Kassem, O., 2014, Evaluation of groundwater quality in an evaporation dominant arid environment; a case study from Al Asyah area in Saudi Arabia, Arabian Journal of Geosciences, 8, 6237–6247.
• Alharbi, O, Allafouza, O., and Zaidi, F., 2015, Assessment of groundwater chemistry from shallow alluvial aquifers in parts of Wadi Al Hamad, Madinah, Saudi Arabia.
Assessment of groundwater chemistry from shallow alluvial aquifers in parts of Wadi Al Hamad, Madinah, Saudi Arabia
The present study was carried out in the Mulaylih area which forms a part of the Wadi Al Hamad in the Madinah province of Saudi Arabia. Thirty groundwater samples from agricultural farms were collected and were analyzed for various physio-chemical parameters including trace elements. The area is occupied by the Quaternary alluvium deposits which form shallow unconfined aquifers. Evaporation and ion-exchange are the major process which controls the groundwater chemistry of the area. The extreme aridity has results in high TDS values (Average of 9793.47 mg/l). Trace element concentrations are low and are mainly attributed to geogenic sources (silicate weathering). Na-Cl groundwater type is the main hydrochemical facies found in the area. The waters are found to be oversaturated with calcite/aragonite and dolomite. The average nitrate concentration was found to be 134.10 mg/l and is much higher than the WHO recommended limit of 50 mg/l in drinking water. Their high values are mainly associated with the application of N-fertilizers on the agricultural farms. The average Fluoride concentration in the study was found to be 1.54 mg/l which is also higher than the WHO permissible limit of 1.5 mg/l in drinking water. Relation between F and Cl and Cl and Na reveal that the fluoride concentrations are mainly attributed to geogenic sources. Principal component analysis resulted in extraction of four principal components accounting for 79.5 percent of the total data variability and supports the fact that the natural hydrochemical processes (evaporation and ion-exchange) control the major ion chemistry.