Khalid J. Dawood
Supervised: Ayser M. Al-Shamma'a
University of Baghdad … College of Science … Dept. of Geology
A new method has been proposed in this study for delineation of flood prone areas through integration of catastrophe theory and analytical hierarchy process (AHP) in a geographical information system (GIS). Seven causative flood factors were selected for this purpose based on data availability and literature reviews, namely, ground surface elevation, slope angle, curvature, topographic wetness index (TWI), stream power index (SPI), drainage density , and land use land cover. The raster maps of the factors were prepared with a cell size of 30 × 30 m from the USGS. The catastrophe models were used to derive weights of the factors using weighted linear combination technique, while AHP was used to compute normalized ranks of the classes of each factor. The model was applied to delineate the flood prone zones in northeastern parts of Southern Iraq(Ali Al-Garbi area) , where flash flood is a recurrent natural hazard that causes damage to civil property almost every year. The study classify the area into three regions the low, moderate and high susceptible to flood.
The high flood susceptible zones are mainly distributed around the intermittent streams and the low lands, while the low flood susceptible zones are found in the hilly regions.