جستجوی مقالات مرتبط با کلیدواژه « مخاطره سیلاب » در نشریات گروه « جغرافیا »

Environmental hazards are one of the influential factors in human societies and are considered as major disasters. According to the UNDP Global Report on Disaster Risk, floods, earthquakes and droughts have the highest financial and human losses. The main purpose of this study is to assess and zoning the vulnerability of urban settlements in Khuzestan province to flood risk. In the research, using fuzzy and hierarchical analysis methods, the existing layers are standardized and a weight is assigned to each of the criteria, and finally, the final flood map in Khuzestan province is prepared based on the overlap models. The results of flood zoning showed that Khuzestan region is divided into five areas of very high, high, medium, low and very low vulnerability in terms of flood vulnerability. Areas with very high vulnerability with an area of ​​14177 square kilometers about 23%, areas with high vulnerability with an area of ​​20077 square kilometers about 32.7%, areas with moderate vulnerability in terms of flooding about 9509 square kilometers and 15.5% and areas with low vulnerability and Very little, with 11,355 and 6,303 square kilometers, respectively, they cover about 18.5% and 10.3% of the area of ​​Khuzestan province. Also among the about 37 important cities located in this province; 18 cities are located in areas with very high vulnerability and 12 cities in areas with high vulnerability in terms of floods.

The geomorphic units of the fluvial system components are in a way that in many cases geomorphic processes are causing environmental hazards such as floods. In this research Torghabeh city and its basin have been studied for the hazard of a river geomorphic processes. Torghabeh town as a regional and international tourism attraction is 20 kilometers far from the metropolitan city of Mashhad. The output of the upstream catchment basin with regard to the geomorphic variables highly affect the flooding possibility of the city.
In order to conduct the present research, a laboratory analytical method to investigate the behavior of the studied basin, the fluvial geomorphic variables and factors in the flood hazard area, including lithology, elevation, slope, land use, precipitation, vegetation, drainage density, distance from the stream, form factor, slope and soil were selected and included in the research. The layers were required to prepare, prioritize and establish the relationships between these variables and the vulnerability of the Analytic Hierarchy Process (AHP). The Expert Choice software was used to help wit the analysis . Critical flood hazard zones are mainly rural area with densities, recreational areas and resorts, tourist and Network Access Account in Mashhad. It is important to notice that, the man-made factors such as residential and utility violated the privacy of rivers and streams, lack of engineering structures such as bridges over rivers of improper aggravating factor are the most significant variables in the flood hazard area. Leveling and terracing of slopes for construction not only disrupts the balance , but also it has increased the weight of the load of flood intensity. The damages caused by the flood of mass movements within the city limits has been exacerbated in Torghabeh.