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What are sabkhahs, and how do they form along the Persian Gulf coast?
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Arabian Desert
The Arabian Desert, the largest desert in Asia, covering an area of about 900,000 square miles (2,300,000 square km).
A sabkhah (also spelled sebkha) is a saline flat or salt-crusted depression, typically characterized by a gently sloping sandy plain where salt brine is concentrated at or just below the surface. These features often have soft, impermeable floors and may contain deposits of gypsum, calcite, and aragonite.12
Along the Persian Gulf coast, sabkhahs form through a combination of geological and environmental processes:
- Coastal Infilling: Sabkhahs are formed by the filling of coastal embayments with sand, a process that continues as sea levels retreat.2
- Evaporation: The region's high rate of evaporation concentrates trapped seawater into strong brine. In the shallow coastal waters, high temperatures and salinity lead to the chemical precipitation of calcium sulfate and sodium chloride, which contributes to the formation of these extensive salt flats.23
- Tidal and Wind Influence: High tides can spread saline surface waters inland, while strong shamal winds scour the sandy surface, exposing the salty crust. This crust may then be dissolved into brine by winter rains.2
- Flooding: During periods of strong onshore winds, coastal water levels can rise significantly, causing extensive flooding of the low-lying sabkhahs.4