A NEW MODEL FOR ASSESSMENT OF EROSION USING DESERTIFICATION MODEL OF IMDPA IN MAZAYJAN PLAIN, FARS PROVINCE, IRANMasoud Masoudi and R. Zakeri Nejad
The entire land of Southern Iran faces problems arising out of various types of desertification of which erosion forms a major type. The Mazayjan plain, located centrally to this zone, has been selected as a test area to assess the hazard of this kind of desertification. The present paper attempts to use a new model for assessing hazard of desertification, namely, IMDPA by considering various indicators of desertification for finding areas with higher hazard of erosion in the study area. The different kinds of data gathered from the records and published reports of the different governmental offices of Iran have been used for this purpose. The thresholds for the severity classes of indicators of two types of water and wind erosion have been considered and then the hazard map for each indicator of these types of desertification has been prepared in a GIS. The hazard maps of water erosion and wind erosion have been produced for the study area. The hazard classes of different hazard maps are calculated on the basis of classification of hazard scores derived by cumulative effect of all the attributes of indicators after overlying them in the GIS. Hazard maps of two erosion types show almost equal per cent for different hazard classes. Results show that the areas under moderate hazard are the most extensive class in both the erosion maps. The final map of erosion is produced by overlaying the both maps. Results show that again the areas under moderate hazard are the most extensive class in the final map of erosion.
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