Schulz, Stephan ; Horovitz, Marcel ; Rausch, Randolf ; Michelsen, Nils ; Mallast, Ulf ; Köhne, Maximilian ; Siebert, Christian ; Schüth, Christoph ; Al-Saud, Mohammed ; Merz, Ralf (2015)
Groundwater evaporation from salt pans: Examples from the eastern Arabian Peninsula.
In: Journal of Hydrology, 531
doi: 10.1016/j.jhydrol.2015.10.048
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The major groundwater resources of the Arabian Peninsula are stored in the large sedimentary basins in its eastern part. Evaporation from continental salt pans (playas) is an important process in water resources assessments of its upper principal aquifers - the Upper Mega Aquifer system - as it constitutes a significant sink. However, literature values on evaporation rates vary widely and usually report about coastal salt pans where seawater evaporation is assumed. The present study applies different methods to provide a comprehensive picture of groundwater evaporation from salt pans of the Upper Mega Aquifer system. A remote sensing approach provided the spatial distribution and total salt pan area of about 36,500km2. Hydrochemical and isotopic investigations revealed that from about 10% (3600km2±1600km2) of the mapped salt pan area seawater evaporates. To estimate the groundwater evaporation rate from continental salt pans a laboratory column experiment was set up, implying a mean annual evaporation rate of about 42mm±13mm. In-situ analysis of water table fluctuations in the field suggested about 3mma-1 originate from recently infiltrated rainwater leading to an annual net groundwater evaporation of 39mm±13mm. Relating this number to the mapped salt pan area, from which groundwater evaporates, provides a total annual groundwater loss of 1.3km3±0.5km3 for the Upper Mega Aquifer system.

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