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Gorgan Bay Water Salinity Modeling under the Scenario of Water Transfer from Caspian Sea by Pipeline

Neysari, Ali Naser | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55638 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Raie, Mohamad
  7. Abstract:
  8. Gorgan Bay and Miankaleh Wetland have been exposed to various environmental risks in the past years due to the decrease in the Caspian water level and the subsequent decrease in the water level of these water bodies. 2 channels, Chapgoli and Ashuradeh, are the only ways connecting the Gulf with the Caspian Sea. If the water level of the Caspian Sea and the Gulf continue to decrease, these 2 channels will be completely blocked and the connection between the Gulf and the sea will be completely closed. Due to the low depth of the bay and high evaporation on this water body, the blockage of these 2 channels will eventually lead to drying up of the bay or changing the flora and fauna of the area. In order to study the scenarios of changes in salinity, flow and water level of Gorgan Bay and Miankaleh Wetland under different scenarios of Caspian Sea water transfer, finite volume numerical modeling has been used. In this study, the wave and current model of the Caspian Sea was built first, and after sensitivity analysis and calibration, the open boundary data of the Gulf model was extracted from the Caspian Sea model. The results obtained from the local wave and current model of the bay and the Miankaleh wetland indicate that the transfer of sea water under different scenarios not only did not increase the salinity of this water body, but also decreased the salinity in some parts of the wetland and bay. For example, under the scenario of transferring sea water of the volume of 400.5 million cubic meters per year to a point near Ismail-Sai in the last four months of the year, the salinity in the stations of Ismail-Sai and the Ghaloghah is decreased about 0.5 PSU and under the scenario of transferring400.5 million cubic meters of water from the Caspian Sea to the point near Toska River, the decrease in salinity in the westernmost part of the Miankaleh wetland in the summer season is equal to 5 PSU. It should be noted that none of the scenarios cause noticeable changes in the speed and direction of the flow inside the bay.
  9. Keywords:
  10. Miankaleh Peninsula ; Flow Modeling ; Water Transfer ; Sea Water ; Goragan Bay ; Finite Volume Method ; Wave Modeling ; Water Salinity Simulation

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