Document Type : Research Paper

Author

• Samad Shadfar

Abstract

One of the types of environmental hazards that causes the destruction of agricultural lands, rangelands and Infrastructure in many parts of the country is gully erosion. In this research, fuzzy logic operators were used with the aim of determining the different hazard zones,obtaining the area of each one of them, and presenting the map of the gully erosion hazard in Troud watershed. In order to achieve this goal, satellite imagery, interpretation of 1:20000 scale aerial photos, 1:50000 scale topographic maps, 1:100000 scale geological maps, field studies and ArcGIS software have been used as the main research tools. To do this, at first, some of the effective variables which had more important roles in the formation and development of gully erosion, as well as the areas with gully erosion, were identified. In the next stage, the effective factor classes were weighted and the gully erosion map was prepared using fuzzy operators including fuzzy algebraic sum, fuzzy multiplication, fuzzy gamma 0.5 and fuzzy gamma 0.8 in the GIS environment.The results indicate that in the fuzzy algebraic summation method, 100% of the gully areas are located in very highclass, in the fuzzy algebraic multiplication, 83.29% of the gully areas are located in low class, in 0.8 fuzzy gamma method,60.93% of the gullies are located in low class and about 17 %are located in high and very high classesbut, in 0.5 fuzzy gamma method, around 1.5% of the gully areas are located in low class and about 62% are located in high and very high classes.

Keywords

• Troud watershed basin
• Geomorphology
• geographic information system (GIS)
• Gully erosion
• Fuzzy logic