Publication: Erosión y desertificación.-Risk assessment of desertification using GIS in parts of Mond Basin, Southern Iran
Authors
Masoudi, M. ; Asrari, E.
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Universidad de Murcia
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Publisher
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DOI
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info:eu-repo/semantics/other
Description
Abstract
ABSTRACT
The present paper attempts to evolve a new model by considering various indicators of
different types of land degradation or desertification, namely, water erosion, soil salinity,
vegetation degradation, and lowering of ground water table. The Mond river basin, located
centrally to this zone, has been selected as a test area to assess the risk and kind of
desertification. For this purpose two sub basins of the Payab and Qareh Aghaj have been
chosen for detailed study. The thresholds for the severity classes of indicators have been
established and then the hazard map for each indicator of types of desertification has been
prepared in a GIS. The risk maps of water erosion, soil salinization, lowering of water table,
vegetation degradation have been produced for each of the two sub basins. It was possible
to distinguish the areas under ‘actual risk’ from areas under ‘potential risk’ of desertification
types. Also areas under potential risk are classified to subclasses with different probability
level to show a statistical picture of risk in future. The final map of risk of desertification is
produced by overlaying all four maps of degradation types. Between the two basins the
overall environmental condition in the Payab sub basin is worse. Results show that potential
risk areas are much widespread than areas under actual risk in the upper reaches (Qareh
Aghaj sub basin) of Mond basin, indicating further threat of land degradation or
desertification in future. While per cent areas under actual risk are much extensive in the
lower reaches (lower reaches), indicating the higher degradation at present.
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