mostafa nahid; mohammadreza zandmoghadam; zeynab Karkehabadi
Abstract
With rapid growth of urban construction and urbanism as well as creation and development of infrastructure, flooding in urban areas has become more controversial. Occurrence of urban flood hazards in human settlements causes irreparable damages to the citizens. Therefore, in order to decrease the psychological ...
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With rapid growth of urban construction and urbanism as well as creation and development of infrastructure, flooding in urban areas has become more controversial. Occurrence of urban flood hazards in human settlements causes irreparable damages to the citizens. Therefore, in order to decrease the psychological and social impacts of urban flooding, attention to resilience approach of urban flood is discussed. The study of literature shows that enhanced resiliency against natural disasters is affected by social, economic, physical and managerial factors. Accordingly, the main objective of this study is to investigate the mentioned structures on resiliency of Tehran metropolitan area against urban flood. The methodology of this study is practical and in terms of survey and descriptive - analytical. The results of the study showed that in terms of socio - cultural index, the most favorable areas were identified. In terms of economic index, according to the components of the relevant component, the study area is the most desirable areas in terms of economic resilience. Also, managerial - institutional resiliency has been the most suitable areas in terms of managerial - institutional resiliency. In the physical resilience, according to the structure of the region and using wlc and ahp methods, it was found that the strengths and weaknesses of the region have a good physical resilience.
Samaneh Razavizadeh; Ali Salajegheh; Shahram Khalighi Sigaroudi; Mohammad Jafari
Abstract
Land use change is one of the main factors in the process of changing the regime of flood in watersheds. Taleghan watershed has been subjected to many land use changes over years, which probably effects on flood characteristics of Taleghan River. In present study the effects of land use change on some ...
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Land use change is one of the main factors in the process of changing the regime of flood in watersheds. Taleghan watershed has been subjected to many land use changes over years, which probably effects on flood characteristics of Taleghan River. In present study the effects of land use change on some parameters including peak flow, volume and flood base time, in part of Taleghan basin, was investigated by using Geographical Information System (GIS) and HEC-HMS model. Land use maps of 1987 and 2002 were prepared and integrated with soil hydrological groups and pasture conditions maps in GIS with the aim of providing of CN map. Then by using curve number and SCS unit hydrograph in sub basins and also Muskingum routing method, HEC-HMS model was calibrated and validated, for 10 incident rainfall - runoff views. Results of the simulation showed that due to the changes in land use (the reduction in the level of agricultural lands and increases in pasture areas), peak flow and flood volume in 2002 than in 1987 showed the average reduction of 46% and 34%, respectively. The evaluation of base time of flood showed no change in the parameter in flood hydrograph at the study period. On the whole the results showed that the trend of land use changes have the positive effect on reducing flood productions in study area.
