vahid sohrabi Articles List

List of Articles vahid sohrabi

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1 - Evaluating the relationship between resilience and vulnerability in the face of natural hazards using geographic information system and Dimitl analytical model and ANP network analysis (case study: Bandar Abbas city)
vahid sohrabi mohammad ebrahim afifi marzieh moghali

Introduction: Today, the occurrence of natural hazards and the damage and casualties caused by these hazards in different parts of the world have made making cities and urban areas safer, becoming a long-term but achievable challenge. Making cities resilient in differen More

Introduction: Today, the occurrence of natural hazards and the damage and casualties caused by these hazards in different parts of the world have made making cities and urban areas safer, becoming a long-term but achievable challenge. Making cities resilient in different dimensions is a suitable and efficient way to strengthen the city's structure to deal with natural and unnatural crises and hazards. Therefore, the purpose of this research is to investigate the relationship between the resilience of Bandar Abbas city and the state of vulnerability to natural disasters. Methodology: research method in terms of purpose, applied and in terms of descriptive-analytical survey method, the method of collecting information in the form of documents (library) and field (interviews and questionnaires) and to analyze data from geographic information system and analytical model of DeMitel and network analysis of ANP is used. The investigated variables in order to explain the resilience of Bandar Abbas city are the state of open spaces, incompatible uses, land (substrate), building resistance, access, ownership, density, which are analyzed in the presented paradigm. After collecting the points and the product of the points in the obtained coefficients, from the statistical processes to the urban resilience model, the final measurement of the urban resilience in Bandar Abbas has been made. Results: The results show that its value was calculated as 5.44398, which indicates that there is an urgent need to formulate programs and reform structures to increase the level of resilience in this urban area Manuscript profile
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2 - Sensitivity analysis of Manning roughness coefficient of rivers in HEC-RAS model to determine flood zones (case study: Ker River- Fars province)
vahid sohrabi Farshid Hashmipour Petkoi Hamid Sheikhpur Shahi

Introduction: Rivers are one of the few natural phenomena that, despite the countless damages they have caused to humans since a long time ago, due to their special impact on human life and the formation of civilizations, humans have always been called to the lands alon More

Introduction: Rivers are one of the few natural phenomena that, despite the countless damages they have caused to humans since a long time ago, due to their special impact on human life and the formation of civilizations, humans have always been called to the lands along the river. In Iran, due to its large size, multiple climates, and temporal and spatial density of rains in most watersheds, huge floods have been witnessed in most regions of the country every year, many of which cause a lot of human and financial losses.Methodology: In this research, 10 km long stretches of the Ker River (downstream of the Chamriz Hydrometric Station) were selected, and after preparing the statistics of the maximum instantaneous discharge of the river in two states before and after the construction of the Molla Sadra Dam, the effect of the construction of the dam on the river flow Checked out. Then, taking into account the river discharge per discharge with a return period of 25 years for two situations before and after the construction of the dam, the permanent flow model of the mentioned river was prepared by HEC-RAS software and then compared with each other. In the following, based on discharge with a return period of 25 years after the construction of the dam, the Manning roughness coefficient was changed to 50% of the initial value and the HEC-RAS model was implemented again. The construction of the said dam has caused some parameters such as water level, water flow speed, water flow area, flow rate in the river and also the flood of its plains to decrease.Results: The results of the sensitivity analysis of some parameters in relation to Manning's roughness coefficient showed that with the decrease of Manning's roughness coefficient, some parameters such as water level and flow area also decrease and parameters such as water flow speed, river discharge, river discharge on the right bank and the left increases and vice versa. Manuscript profile
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3 - Earthquake risk zoning in Bastak city using FUZZY-AHP model
vahid sohrabi mohammad ebrahim afifi

Iran is one of the most earthquake-prone countries in the world and its cities have suffered a lot of damage due to this natural hazard. Knowing the areas exposed to these risks is one of the first steps in risk management and development and construction planning. In t More

Iran is one of the most earthquake-prone countries in the world and its cities have suffered a lot of damage due to this natural hazard. Knowing the areas exposed to these risks is one of the first steps in risk management and development and construction planning. In this research, the aim is the zoning of earthquake risk in Bestak city using the FUZZY-AHP model. The research method was descriptive-analytical. In the descriptive discussion, the necessary data were collected using library and documentary studies, and in the analytical discussion, fault maps, earthquakes, elevations, waterways and canals network maps, slope value maps, etc. were prepared, and then with the geographic information system ( GIS) each of the factors of the layers was valued and finally the final map was obtained by overlapping with the AHP model. Bestak city is one of the subordinate cities of Hormozgan province, located between the geographical coordinates of ˝00 21 ° 54 ° to ˝ 11 22 ° 54 longitude and ˝00 11 ° 27 to ˝02 12 ° 27 latitude is located. This map was proposed based on the geomorphological and land use conditions and the areas prone to urban development. The results showed that the physical development of the city during the past decades was subject to the topographical conditions and there are many geomorphological risks and limitations in the study area. According to the results of the research on the optimal location of city development, according to the experts, the parameter of gasoline pumps in the city center has the highest weight of 0.195 and the earthquake parameter has the lowest weight of 0.01 in a pairwise comparison. Finally, the final map resulting from the overlapping of all factors was obtained. According to the maps obtained by overlaying the AHP model and applying weights to the information layers, the earthquake vulnerability classes included very low, low, medium, high and very high. The area of the classes was 11.25, 9.53, 13.17, 15.69 and 9.58, respectively. A large area of the study area is at high risk; Therefore, solutions for crisis management should be implemented when necessary. Manuscript profile

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