SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Optimization of watershed control strategies for reservoir eutrophication management 
Authors:Karamouz, M., M. Taheriyoun, A. Baghvand, H. Tavakolifar and F. Emami 
Journal:Journal of Irrigation and Drainage Engineering 
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URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:BMP assessment (genetic algorithm or similar optimization approach) 
Secondary Application Category:climate change  
Watershed Description:930 km^2 Aharchai river watershed (Satarkhan reservoir) in northwestern Iran 
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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 (Global Circulation Model) 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 (GA). 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. 
Keywords:SWAT model, best management practice (BMP), Genetic Algorithm, system dynamic