Climatic Water Balance
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This study is a trial to understand the mechanisms of groundwater recharge in the sand dunes and gravel plains, which cover about 80% of the surface area of the UAE. The study indicated that the percentage of runoff from rainfall is 18% in the northern Oman Mountains and 3% in the Jabal Hafit area.
In this investigation, 75 sediment samples were collected from dune and interdune areas for grain-size analysis and hydraulic conductivity (K) measurement, which were conducted in the laboratories of the Faculty of Science of UAE University.
Infiltration capacities (Ic) were measured at 27 sites during sampling. Monthly values of rainfall and potential evapotranspiration (PET) were used to calculate any water surplus (Ps) in the study area. The results contributed to understanding of hydraulic properties of sand dunes and interdune areas around Al Ain City, Eastern Region of the Abu Dhabi Emirate. Results also showed that about 25% of Ps recharges the western gravel aquifer within the study area. The minimum amount of rainfall that can cause surface runoff is about 90 mm/year in the northern Oman Mountains in the UAE and 70 mm/year in the Jabal Hafit area.
The data obtained from studying the hydraulic properties of sand dunes can be used for calibration of numerical models that simulate groundwater flow and solute transport in the Quaternary sand aquifer and in the sand-and-gravel aquifer system.
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