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Modeling Phosphorous Movement in Watersheds with SWAT (Case Study: Kan Watershed)

Delkash, Majid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44458 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tajrishy, Masoud
  7. Abstract:
  8. Maintaining the quality of water is of paramount importance for lakes with tourist attraction capacity. Inaccurate prediction of the quality state of lake in design phase may lead to some trouble in future. Kan River known as the main source of water feeding for the urban lake located in the north of Chitgar park passes through various villages and restaurants discharging nutrients via runoff and wastewater in the aforementioned river. Previous investigations reveal that phosphorous plays a central role in the water quality of this river and the associated downstream lake. In this research, Kan watershed,located in in the north-west of Tehran, was simulated. Considering the "Total Maximum Daily Load" (TMDL) approach helped us assign the contributions made by any point and non-point sources. The Soil and Water Assessment Tool(SWAT) was employed to simulate the hydrology and quality of Kan river and watershed. The first step to gain this goal was hydrological simulation of watershed. Next, the fate of phosphorous was studied, then the contribution of sources was assigned and finally some Best Management Practices(BMPs) were dedicated to ameliorate the condition of water quality. The simulation revealed that about 65% of P load was due to high concentration of P in soil and the remaining was attributed to village discharges. To find out the best solution in reducing P load in Kan river,various scenarios were employed and domestic wastewater treatment was introduced as the best solution. It could ameliorate the condition with reducing the total load by 35%. Strip cropping on contours and small wastewater treatment plant were considered as BMP. Strip cropping could reduce the P load by 1.1 to 7% depending on the subbasin and if small plants were installed in Imamzadeh Davood ,it could decrease annually P load in Kan river by 1.5% annually
  9. Keywords:
  10. Kan Basin Reservoir ; Phosphorus ; Urban Lake ; Total Maximum Daily Load (TMDL) ; SWAT Software

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