%0 Journal Article
%T Flood risk zonation in the farahzad basin (Tehran) using Fuzzy model
%A E. Ghanavati
%A A. Karam
%A M. Aghaalikhani
%J Geography and Environmental Planning
%D 2013
%I 
%X Extended abstract1- Introduction Flood event is very important in humanities center and urban because they are effective on Capabilities production of runoff in this area and increase the financial and human losses due to its population density and infrastructure. As respects Collection and dispose of runoff from the rainfall in the river stream in fact are safety, public health and utilities and several flood events in Tehran that in some instances are financial losses and damages to human lives indicate necessity integrate study are about flood in the basins upstream of Tehran. So the purpose of this study determines areas with highest flood risk in the Farahzad basin. Basin Farahzad is located in upstream of the city of Tehran and the area is 22.29 km2. It is located in latitude '47   35 to '5   35 north and longitude '19   51 to '21   51 east. Considering the fact that phenomena as flooding are affected by many factors that these factors are not certain and exact and these are affecting probabilistic and inconclusive, so a method to Fuzzy model used for the areas in the flood risk.2- MethodologyAccording to research purposes, data and information layers slope, profile and planimetric curvatures, elevation, drainage density, distance from the river, landforms and land use were assigned as effective parameters to flooding. To prepare the these data and layers are used the Tajrish topography map with scale 1:50000, NI 39-3 number, K551 Series, page 2661I, Tehran geology map with scale 1:100000, Tehran Resource evaluation and land capability map scale with 1:250000, satellite image landsat ETM+ and satellite image IRS-LISS III.To analyze satellite images, according to the capabilities Erdas software used according to the capabilities of this software in image processing and modeling also full adaptation with the ArcGIS software.After providing information¡¯s mentioned above and determining kind of their relation with the flood appoint membership function for each of the parameters. After applying membership function to layers in Arc GIS software, all layers have values between zeros to one, then layers entered to fuzzy model. To perform fuzzy technique, it is necessary to use operators as union, Subscription, Gama, algebraic multiplication and sum. In this research Gama, algebraic multiplication and sum is used. In this study used Gama, algebraic multiplication and sum operators. First algebraic sum and multiplication operators applied to the layers which amount of membership is determined, then to find the final map of flood zonation and to adjust prepar
%K zonation
%K flooding
%K fuzzy
%K Farahzad
%K risk
%U http://uijs.ui.ac.ir/gep/browse.php?a_id=813&sid=1&slc_lang=en