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Flood Risk-Based Design for Roads and Pipelines Crossing from Wetlands; Case Study: Horulazim Wetland

Mousavi Maleki, Abdolmajid | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56343 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Raie, Mohammad
  7. Abstract:
  8. One of the natural functions of wetlands is to neutralize the dangers caused by floods. Therefore, if a facility is built in the area of wetlands, it should not disturb their natural functioning. During the Iran-Iraq war, several antenna roads were built across the wetland, and the construction of these roads divided the wetland into 5 separate reservoirs. After the end of the war and with the development of the oil fields west of Karun (Hor al-Azim region), the extraction of oil from this region was put on the agenda. With the flood of April 2018, these facilities and roads were exposed to damage and flooding, and oil production from these reservoirs was stopped. In this research, after identifying the types of failures caused by floods, with the help of failure mode method and analyzing its effects on roads and pipelines, the risk number of each failure is calculated. Then, with the help of calculated risks, high risk failures are determined. In the following, the way of passing steel pipelines through Horul-Azim wetland is discussed and the advantages and disadvantages of possible methods are mentioned for each case. Also, by calculating the value of the cost-benefit ratio of the existing roads in the wetland area, the optimal elevation of the roads against floods with different return periods is calculated. Among the eight methods of passing the pipeline parallel to the road, the method of passing through the concrete chamber under the road (the first method), the buried method under the road (the second method) and placing it on the road and implementing an embankment on it (the third method), It was chosen as the selected methods of pipeline crossing based on the mentioned criteria. Based on the results of calculated risk numbers, the existing road against floods with return periods of 25 and 50 years has high risk numbers in Northern Exploration Road. In calculating the cost-benefit ratio, the return periods of 50, 100, 200, 300 and 500 years are also economic in terms of promoting the road
  9. Keywords:
  10. Cost-Benefit Analysis ; Roads Crossing the Wetland ; Flood Risk Analysis ; Cost-Benefit Ratio Calculation ; Flood Return Period ; Pipelines Crossing the Wetland

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