Optimization of Watershed Control Strategies for Reservoir Eutrophication Management
by Mohammad Karamouz, F.ASCE, (Research Professor, Polytechnic Institute of NYU, Six MetroTech Center, Brooklyn, NY 11201; and Professor, School of Civil Engineering, Univ. of Tehran, Enghelab Ave., Tehran, Iran. E-mail: mkaramou@poly.edu), Masoud Taheriyoun, (corresponding author), (Ph.D. Candidate, Faculty of Environment, Univ. of Tehran, Ghods St., Enghelab Ave., Tehran, Iran E-mail: taherion@ut.ac.ir), Akbar Baghvand, (Assistant Professor, Faculty of Environment, Univ. of Tehran, Ghods St., Enghelab Ave., Tehran, Iran. E-mail: baghvand@ut.ac.ir), Hamed Tavakolifar, (M.S. Graduate, School of Civil Engineering, Univ. of Tehran, Enghelab Ave., Tehran, Iran. E-mail: htavakoli@ut.ac.ir), and Farzad Emami, (M.S. Graduate, School of Civil Engineering, Univ. of Tehran, Enghelab Ave., Tehran, Iran. E-mail: farzad.eee@gmail.com)
Journal of Irrigation and Drainage Engineering, Vol. 136, No. 12, December 2010, pp. 847-861, (doi: http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0000261)
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| Document type: |
Journal Paper |
| Abstract: |
A vital key to the development of a reservoir eutrophication management strategy is to link the watershed-nutrient model to the model of reservoir water quality. To develop a cost-effective optimization model, a coupled watershed-reservoir model with an optimization model has been developed to design control strategies in the watershed in a planning time horizon. This methodology can help reduce the phosphorus concentration of a reservoir to the standard level. In this study, the weather data for the next 10 years was generated using downscaled GCM data to simulate the watershed phosphorus load using the SWAT model. Then an optimal model for selection and placement of best management practices (BMP) at watershed scale is developed by linking the coupled watershed and reservoir models with a genetic algorithm. This model is able to identify the minimum present cost design (type and location) of BMP structural alternatives. The objective of water quality is obtained using a system dynamic model for reservoir phosphorus concentration to determine a permissible phosphorus load as the main agent of eutrophication in a reservoir. Structural BMPs in this study include, filter strips, parallel terraces, grade stabilization structures, and detention ponds. The optimum solution was obtained through a trade-off curve between cost and exceedance magnitude from the standard of reservoir phosphorus concentration. The case study is the Aharchai River Watershed upstream of the Satarkhan Reservoir in the northwestern part of Iran. |
| Author Keywords: | 
| SWAT model |
| Best management practice (BMP) |
| Genetic algorithm |
| System dynamic |
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