Assessment, Completion and Development of Prediction Model for Determining Susceptiblity of Lands to Gully Erosion Arid and amp; Semi _Arid Watersheds
2011
Shadfar, Samad | Peyrovan, Hamidreza | khalkhali, Ali | Jafari Ardakani, Ali | Ghiasi, Najafqoli | Tabatabae, Mahmodreza | Arabkhedri, Mahmud | Sharifi, Esmail | Sarreshtehdari, Amir | Sepanji, Abdollah
In this research gully erosion in arid and semiarid watersheds, for retesting and revalidation were investigated in Kahkiloeh- Boyerahmad , Boshahr ,Gilan, Gom, Markazi provinces . Therefor, with investigation of gully distribution in provinces, was selected watersheds for research. In selected watersheds several maps including landuse, Lithology , landunits, and slope were prepared from which working units were extracted. In working units was recognized 3 specific gullies. In each working unit, several soil profile were drilled from which soil samples were taken and analized in order to determination of soil characteristics. The morphometic chractristics of Gullies were investigated with gully survey. In each working unit, soil peneteration condition and soil conservation percent were investigated. After determination of factors, related quantity values were determined. Finally the map of gully erosion were prepared using index overlay model, fuzzy algebraic sum, fuzzy algebra product and fuzzy gamma in Gis. On the basis of obtaind result and with taken into consideration of different zoning area and occurance of their gullies, the fuzzy gamma model of 0/8 is the more proper method to investigation of gully erosion in studied watershed.
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