| Title: | Optimization of watershed control strategies for reservoir eutrophication management |
| Authors: | Karamouz, M., M. Taheriyoun, A. Baghvand, H. Tavakolifar and F. Emami |
| Year: | 2010 |
| Journal: | Journal of Irrigation and Drainage Engineering |
| Volume (Issue): | 136(12) |
| Pages: | 847-877 |
| Article ID: | |
| DOI: | 10.1061/(ASCE)IR.1943-4774.0000261 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic and 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 |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| 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. |
| Language: | English |
| Keywords: | SWAT model, best management practice (BMP), Genetic Algorithm, system dynamic |