Assessment of soil erosion zonation using F.A.O model in maroon basin

Subject Areas : geo

حمید بابلی موخر ¹ , Kourosh Shirani ² , morteza khodagholi ³

1 - مدرس دانشگاه فرهنگیان
2 - Assistant Professor at Isfahan agricultural and natural resources research and education center
3 - Assistant Professor, Soil Conservation and Watershed Management Research Department, Isfahan Agricultural and Natural Resources, Research and Education Center, AREEO, Isfahan, Iran

Received: 2016-12-05 Accepted : 2017-05-22 Published : 2018-01-21

Keywords: zonation, FAO Model, Maroon basin, Soil Erosion, Gachsaran formation,

Abstract :

The Soil erosion mapping is the priority basement of soil conservation program in the watershed management. This study aimed to apply the FAO model and assessing factors affecting erodibility of soil using GIS and producing soil erosion map in Maroon watershed. For this purpose, the basin maps were digitized in a scale of 1:50,000 and they were integrated with each other by using ArcGIS10.3 software. Homogeneous units map was produced. Then, according to the scoring table used in the model of FAO and surveying using GPS in the field and apply the factor scores for each homogeneous units was estimated the final score for each factor and the severity of erosion in homogenous units by GIS. Finally, the produced weight map was reclassified according to the FAO model and the minimum and maximum score of the erosion for the evaluated factors. It was categorized in four classes by including low, medium, high and very high classes. The results revealed that 95 percent of the study area located in the moderate erosion (49.06%) to high (45.98%) and only 5% of the area in the relatively moderate erosion (3.66%) and very high (1.30%) were occurred.