Spatial multi criteria analysis and decision techniques in order to watershed prioritizing for gabion check dams building
2011
Jamali, A. A., Assistant Professor of Watershed Management Dept., Islamic Azad University-Maybod Branch | Ghoddousi, J., Retired Assistant Professor of Soil Conservation and Watershed Management Research institute, Tehran, Iran | Farahpour, M., Assistant Professor of Research Institute of Forest and Rangelands, Tehran, Iran
Compositing many spatial factors and constraints, management, planning and do right decision making in watersheds is very complicate and essentially need to apply computer, GIS and Multi Criteria Analysis (MCA). Hable Roud watershed was selected as study area that located in the north of Garmsar, and west of Firuzkouh. Numerous maps were used as spatial factors and constraints and a criteria tree model for compositing the natural spatial factors, economical spatial factors and spatial constraints were designed to determine suitable sites for gabion check dams construction. Factors were standardized Factors weighing were done by pairwise in analytic hierarchy process (AHP) and direct method. Factor layers were composited by spatial multi criteria evaluation (SMCE) in ILWIS. Outputs were composite index map (CIM) with continuous values from zero to one. This map was classified. By sensitivity analysis, the effect of changes in spatial factors weight was studied and more effectiveness factors were known. It was inferred the most effective factor are covering the basin vastly. Coincidence of implemented and recommended regions show suitability of this built system. Finally, recommended this scenario for gabion check dams building, watershed prioritizing and soil conservation planning. This scenario and model can make optimum program for watersheds accurately and fast.
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