Water Resources Management

, Volume 27, Issue 7, pp 1931–1947 | Cite as

Multiobjective Calibration of Reservoir Water Quality Modeling Using Multiobjective Particle Swarm Optimization (MOPSO)

  • Abbas AfsharEmail author
  • Nasim Shojaei
  • Mahdi Sagharjooghifarahani


Water resource management encounters large variety of multi objective problems that require powerful optimization tools in order to fully characterize the existing tradeoffs between various objectives that can be minimizing difference between forecasted physical, chemical, and biological behaviors of model and measured data. Calibration of complex water quality models for river and reservoir systems may include conflicting objectives addressed by various combinations of interacting calibration parameters. Calibration of the two dimensional CE-QUAL-W2 water quality and hydrodynamic model is an excellent example where the model must be calibrated for both hydrodynamic and water quality behavior. The aim of the present study is to show how multiobjective particle swarm optimization (MOPSO) can be implemented for automatic calibration of water quality and hydrodynamic parameters of a 2-dimensional, hydrodynamic, and water quality models (CEQUAL-W2) to predict physical, chemical, and biological behaviors of a water body, and then focus on a relevant case study. So MOPSO is utilized to generate Pareto optimal solutions for two conflicting calibration objectives. A combined measure of thermal and reservoir water level is considered as the first calibration objective. The second objective is formulated to forecast the best physical, chemical, and biological behavior of the model. Realizing the strong interactions between water quality and hydrodynamic issues of water bodies and their dependencies on the same set of calibration parameters, the proposed multiobjective approach may provide a wide version of all possible calibration solutions for better decision making to select best solution from pareto front.


Multiobjective particle swarm optimization algorithm Multiobjective calibration Water quality modeling Karkheh Reservoir CE-QUAL-W2 


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Abbas Afshar
    • 1
    Email author
  • Nasim Shojaei
    • 2
    • 3
  • Mahdi Sagharjooghifarahani
    • 2
    • 3
  1. 1.Department of Civil EngineeringIran University of Science and TechnologyTehranIran
  2. 2.Department of Civil EngineeringPortland State UniversityPortlandUSA
  3. 3.Maseeh College of Engineering and Computer ScienceThe Northwest Center for Engineering, Science and Technology (Engineering Building)PortlandUSA

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