List of Articles Urban Flood

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  1 - Investigating Changes in the Intensity of Short-Term Rainfall in the Last Half Century in the Context of Data Scarcity (Case Study: Rasht City)
  Mehdi Torabi Alireza Shokoohi
  10.30495/wsrcj.2023.70259.11331
  Background and Aim: With the increase in the production of greenhouse gases due to the industrialization of the countries of the world, we are witnessing the occurrence of global warming, which has caused climate changes all over the planet in recent years. One of the e More

  Background and Aim: With the increase in the production of greenhouse gases due to the industrialization of the countries of the world, we are witnessing the occurrence of global warming, which has caused climate changes all over the planet in recent years. One of the effects of this phenomenon is the change in the behavior of weather parameters such as temperature and precipitation. The effects of climate change phenomenon on precipitation have led to changes in the intensity of precipitation and finally changes in intensity-duration-frequency (IDF) curves of precipitation for different regions of the world and country. Therefore, updating the intensity-duration-frequency (IDF) curves is necessary because of their importance in the design of hydraulic structures used in urban flood management. One of the problems of producing intensity-duration-frequency (IDF) curves is the lack of access to rainfall data with different continuities. The purpose of this research is to use the fractal method to obtain precipitation with different continuities and then evaluate the effect of climate change on the intensity of precipitation in Rasht City. .Method: In this research, the accuracy of the fractal method for generating intensity-duration-frequency curves is first evaluated. Then intensity-duration-abundance curves are produced by using fractal theory and by determining the effect of climate change on rainfall intensity by TREND software, two periods before and after climate change are evaluated and compared.Results: In this research, the validation of the Fractal method shows that the IDF curve production for Rasht city using the Fractal method compared to the IDF curve production using observational data has about a three percent difference. Therefore, this method was used to generate IDF curves for the years when rainfall data with less than three hours of duration was not available. The evaluation of IDF curves with TREND software on the rainfall intensity for different durations demonstrates that the rainfall intensity jump occurred in 2003 towards becoming more intense due to the effect of climate change. For example, for 10 minutes with a return period of 100 years before the effect of climate change, the intensity of rainfall is 158 (mm/h) and after the effect of climate change, the intensity of rainfall is 225 (mm/h). Also, the results showed that the period of short returns has changed more than the period of large returns, that is, the 2-year return period has increased by about 70% and the 100-year return period has increased by about 40%.Conclusion: In this research, by evaluating the fractal method, it was determined that if there is no access to rainfall data with different durations, the fractal method is a suitable method for generating different rainfall durations and generating IDF curves with acceptable accuracy. be Also, the results showed that the jump of intensity-duration-frequency curves occurred under the effect of climate change in 2003, and in the period of climate change, compared to the period before climate change, the intensity of rainfall moved towards more intense rainfall, and this event occurred in the period Short-term returns show a greater increase. Manuscript profile
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  2 - Urban Flood Hazard Zoning Using Multicriteria Decision Analysis (Emam Ali town, Mashhad city)
  Mohammad Rostami Khalaj Dana Hesami Hossein salmani Teymor Tymoriyan
  10.22034/jest.2020.21852.3091
  Background and Objective: Inundation in urban areas due to dens storm has created many problems for all cities thorough the world. Urban flood hazard zoning may provide useful information for dealing with contingency and alleviating risk and loss of life and property.The More

  Background and Objective: Inundation in urban areas due to dens storm has created many problems for all cities thorough the world. Urban flood hazard zoning may provide useful information for dealing with contingency and alleviating risk and loss of life and property.Therefore, in order to manage urban areas, take relief measures and prioritize areas to solve the problem of floods, the areas that are most affected should be identified. Method: Vulnerability of urban areas often includes multicriteria that are associated with flooding. One of the methods that are sufficiently accurate and available which can identify flood hazard zoning, is using multicriteria decision analysis (MCDA) that in this study was used to determine the potential of flood risk in urban area. Six variables include: distance to the main channel, slopes, land use, drainage density, slope of the main channel and elevation was used. After determining paired comparison matrix, layers weight was determined by using the knowledge of experts and experts in the region and finally the map of urban flood hazard were identified. Findings: Hazard Potential Map showed that 8.2% of the areas near to the outlet and located around the main channel are at highest hazard potential. Discussion and Conclusion: The results and field investigation showed multicriteria decision analysis is accurate and appropriate method for urban flood hazard zoning and using this method can identify areas with a greater flooding risk. Manuscript profile
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  3 - Measuring and Evaluating the Resilience of Urban Areas Against Urban Flooding (Case study: Tehran zone 4)
  mostafa Nahid Mohammad Reza Zandmoghadam Zeynab Karkehabadi
  10.22034/jest.2021.56185.5194
  Background and Objective: Due to the rapid growth of cities and increasing urbanization in recent decades, urban runoff and flood damage is one of the most important and fundamental issues in the field of urban management. The purpose of this study is in the first part; More

  Background and Objective: Due to the rapid growth of cities and increasing urbanization in recent decades, urban runoff and flood damage is one of the most important and fundamental issues in the field of urban management. The purpose of this study is in the first part; Quantitative simulation of floods caused by rainfall for region 4 of Tehran for the years 1349-1396 using the SWMM model. Material and Methodology: The simulation was performed for six-hour showers with 2, 5 and 10 year return periods for 12 hours. In this research, two projects of the best management strategies (BMP) under the garden and green roof climate scenario and a combination of both scenarios to control the maximum runoff in terms of quantity and finally their efficiency in reducing the total volume of runoff out of the basin, is studied. In the second part; Evaluation and analysis of resilience caused by urban floods in the 9 districts of Tehran's 4th district in four dimensions: socio-cultural, economic, managerial-institutional and physical. This section is applied in terms of purpose and in terms of survey and descriptive-analytical methods. The statistical population of the study is the total citizens of Region 4, of which the sample size was calculated using the Cochran's formula of 384 people. According to the obtained results, the third scenario (combining the first and second scenarios) will have the greatest impact on reducing the flow depth and flow rate in the entire surface water collection network.      Findings: Findings of the research in the field of resilience assessment and analysis showed that District 5, District 4 of Tehran is the most desirable district and District 1 and District 8, 4 are the most undesirable in terms of resilience against urban floods. Discussion and Conclusion: Districts 4 and 9 are ranked last in terms of resilience-cultural, economic, managerial-institutional), which indicates that this area is weak in some cases, which is to reduce the level of vulnerability. to be noticed. Manuscript profile
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  4 - سنجش و تحلیل مولفه‌های هیدرولیکی اثرگذار بر تاب‎آوری در برابر سیلاب‎های شهری در کلان‎شهر تهران
  کوشا خاتونی مارال نظز محمد نرگسی فربد لؤلؤ
   تاب‎آوری سیستم‎های شهری در برابر سیلاب، به معنی پایداری و مقاومت این سیستم‎ها در برابر آسیب‎های وارده از جانب سیل و توانایی آنها برای بهبود و بازگشت سریع به شرایط عادی پس از رخداد بلای طبیعی یعنی سیلاب می‎باشد. یکی از مسائل مهمی که در دهه‎ه More

   تاب‎آوری سیستم‎های شهری در برابر سیلاب، به معنی پایداری و مقاومت این سیستم‎ها در برابر آسیب‎های وارده از جانب سیل و توانایی آنها برای بهبود و بازگشت سریع به شرایط عادی پس از رخداد بلای طبیعی یعنی سیلاب می‎باشد. یکی از مسائل مهمی که در دهه‎های اخیر سکونت‎گاه‎ها بخصوص کلان‎شهرها، با وجود جمعیت زیاد و تراکم کالبدی با آن مواجه‎اند، مخاطرات طبیعی از جمله سیلاب‎های شهری است. تاب‎آوری در برابر سیلاب‎های شهری یکی از مباحث مهم و البته پیچیده در مطالعات آب و سازه‎های هیدرولیکی است که اخیرا توانسته است توجه بسیاری از محققان را به خود جلب کند. چراکه با بررسی این مفهوم می‎توان نقاط تاب‎آور و غیرتاب‎آور را مشخص کرد و برای حفظ و افزایش تاب‎آوری آن کوشید. از آنجایی‎که افزایش روزافزون جمعیت در کلان‎شهر تهران مشکلات و چالش‎هایی را از نظر مدیریت سیلاب‎های شهری ایجاد کرده است، پژوهشگران این مطالعه سعی کردند، مولفه‎های مهم و اثرگذار بر تاب‎آوری در شاخص  هیدرولیکی را  سنجش و آن  بررسی و تفسیر نمایند. هدف از این پژوهش ارزیابی تاب‎آوری شهری در برابر مخاطرات طبیعی با تاکید بر مدیریت سیلاب شهری در کلان‎شهر تهران است. نتایج تحقیق نشان می‎دهد که مناطق۲۲،۲۰ و ۵ تهران بیش‎ترین تاب‎آوری و مناطق ۹،۱۰،۱۱ و ۱۷ کم‎ترین تاب‎آوری را در مبحث  مولفه هیدرولیکی را در میان مناطق داشته‎اند. Manuscript profile
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  5 - Two-dimensional modeling and zoning of urban flood in the north basin of Karaj city using HEC-RAS 2D
  Kousha Khatooni Farhad Hooshyarypor Roohollah Noori Bahram Bahram MalekMohammadi
  In many areas, urban flood and flood control system are not yet considered as an important issue in the design of the urban fabric and the problems caused by it are clearly seen at the city level. In order to control and manage urban flood, it is necessary to extract ur More

  In many areas, urban flood and flood control system are not yet considered as an important issue in the design of the urban fabric and the problems caused by it are clearly seen at the city level. In order to control and manage urban flood, it is necessary to extract urban flood risk zones and analyze the vulnerability of urban infrastructure assets at risk. Flood risk assessment provides valuable information for flood risk management in order to assess vulnerability and face risk. Achieving this information requires the use of hydrological and hydraulic models and the analysis of damages to various urban facilities and uses. In this research, HEC-RAS hydraulic modeling has been used for two-dimensional simulation with the design return period (25 years) and flood depth and speed zoning for this return period. In this study, with accurate two-dimensional flood modeling, using the 1.5-meter height figure model, analyze and investigate the urban flood risk. The results of the research show that most of the areas that are facing floods and inundation are among the worn-out areas that have an older drainage network design, and the areas of Shahin Vila and Gohardasht are in an unsustainable condition compared to the other two areas and in contrast to the two areas Azimieh and Jahanshahr Karaj have better resilience than the other two regions. Manuscript profile