Article Evaluation and spatial analysis of Floods in a river using Fuzzy Logic in geographic information system environment (Case Study: Qarasou River)

Across the globe, floods have posed a tremendous danger to people's lives and properties and have had a great impact on human development, properties, infrastructures as well as environment. In the paper, we have investigated Qaresou River to the end of reducing, mitigating and management of floods with providing of zoning map using Fuzzy Logic in ArcGIS Environment. For studying the river, we have used parameters such as slope, elevation, a distance of channel, drainage density, land use, lithology, precipitation, profile curvature and planimetric curvature. To provide data and layers we have used DEM, topographical maps(1:50000), geological map(1:100000), land use map of Kermanshah province, a satellite image of Landsat(ETM) and the image IRS- LISS III. The methodology of the research is fuzzy logic in GIS environment to provide zoning map. Results show that the Gama of 0/7 is the best operator for zoning the region. According to the map, the high-risk segment contains 24 percent of the region that has located in the north of the river and the south as well, where Kermanshah city has located. Thus. With a distance of the river in the high elevation and slope, the rate of risk of floods reduce. Results show that the most effect area (in floods map) is located between slope 0-5 degree, elevation 1240-1250m, the group of hydrological soils D, Drainage basin 0/4-1, precipitation 650-750mm, Planimetric profile 0/6, the land use of urban and distance of 500-1500 m of the river.