Mohammad Javad Amiri; Hamid Jourkesh; Ahmad Nohegar
Abstract
Introduction: Flood is caused by a sudden increase in the water level of a river due to heavy rainfall, in which excess water flows out of the basin and the riverbed and enters adjacent areas, causing extensive damage to the region's ecosystems and infrastructure. In order to determine and implement ...
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Introduction: Flood is caused by a sudden increase in the water level of a river due to heavy rainfall, in which excess water flows out of the basin and the riverbed and enters adjacent areas, causing extensive damage to the region's ecosystems and infrastructure. In order to determine and implement a strategic plan in the direction of crisis management, understanding the mechanism and development of the flood phenomenon and the amount of runoff created as a result is a priority.Material and methods: In this study, three events of flood on 16 February 2017, 26 March, 2019 and 23 January 2020, when the average rainfall in the Shiraz watershed was 100 mm every three days, were selected and interacted with a synoptic approach. Atmospheric conditions and flood patterns were identified. Next, using by HEC-HMS hydrological model, the amount of rainfall to runoff conversion in each of the sub-basins in the Shiraz watershed was simulated.Results and discussion: The results showed that the maximum precipitation occurs in February and the minimum in July. The maximum annual rainfall is 627 mm in the mountainous areas of Qalat and Golestan and the minimum is 245 mm in Maharloo lake. Synoptic results showed that the establishment of low altitude and cold-water trough at the level of 500 hPa in the eastern Mediterranean along with the establishment of dynamic low pressure system in Iran caused surface air instability in Fars province and by injecting moisture from the Persian Gulf to the massif. The weather has caused floods in Shiraz. The results of rainfall-runoff modeling showed that the highest runoff in Sadra and Qalat sub-basins were 5773 and 5076 thousand m3, respectively, and the maximum peak discharge in Sadra and Qalat was 666 and 389 m3/sec, respectively. It happened at 17:00. The highest volume of rainfall penetration in Qalat and Chenar Rahdar was 5423 and 2546 thousand cubic meters, respectively, and the lowest level of penetration in the Quran Gate was 247 thousand m3, the main reason being the high density of residential-commercial use in this sub-basin.Conclusion: Therefore, it is suggested that in order to manage the flood crisis in Shiraz, controlling runoff produced in northern sub-basins such as Qalat, Golestan and Sadra and increasing the level of permeability can be effective in controlling floods.
Ali Reza Pourkhabbaz; Hamid Reza Pourkhabbaz,; Saeideh Javanmardi; Mohammad Javad Amiri
Volume 11, Issue 3 , October 2013
Abstract
The rapidly expanding urban areas of the world constitute an environmental challenge for the 21st century that requires both new analytic approaches and new sources of data and information. Ecological Planning with multi-criteria decision making is a process that evaluates the alternative land uses in ...
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The rapidly expanding urban areas of the world constitute an environmental challenge for the 21st century that requires both new analytic approaches and new sources of data and information. Ecological Planning with multi-criteria decision making is a process that evaluates the alternative land uses in relation to its environmental and socioeconomic surroundings, with the purpose of manage the natural resources, preserve the ecosystems and solve or diminish possible environmental conicts. The objective of this research is to determine an ecological capability of urban development by using Fuzzy Logic Model (FLM) in GIS and IDRISI environments for the south zone of Centeral Alborz. This evaluation incorporated ecological factors in the region, such as physical factors (Topography, Elevation, Slope, Soil, Geology, Precipitation, Temperature) and biological factors (Vegetation density and Conservation areas) affecting in urban development land use. First, Urban land-use was categorized according to the classes of ecological word model in Iran, such as suitable, relatively suitable and unsuitable. Then, Multi-Criteria Decision Making (MCDM) was performed to evaluate ecological suitability of the development for each class, according to appropriately measured and weighted factors and a suitability map for the classes was developed using an algorithm that combines factors in the integrated fuzzy method of Weighted Linear Combination- Analytical Hierarchy Process (WLC-AHP). The results indicated that MCDM with FLM has high functionality for environmental evaluation of urban development .
