Water Resources Management

, Volume 31, Issue 4, pp 1121–1138 | Cite as

Improved Understanding on the Searching Behavior of NSGA-II Operators Using Run-Time Measure Metrics with Application to Water Distribution System Design Problems

  • Feifei Zheng
  • Zhexian Qi
  • Weiwei Bi
  • Tuqiao Zhang
  • Tingchao Yu
  • Yu Shao
Article

Abstract

In recent years, multi-objective evolutionary algorithms (MOEAs) have been widely used to handle various water resources problems. One challenge within MOEAs’ applications is a lack of understanding on how various operators alter a MOEA’s behavior to achieve its final performance (i.e., MOEAs are black-boxes to practitioners), and hence it is difficult to select the most appropriate operators to ensure the MOEA’s best performance for a given real-world problem. To address this issue, this study proposes the use of the run-time measure metrics to reveal the underlying searching behavior of the MOEA’s operators. The proposed methodology is demonstrated by the non-dominated sorting genetic algorithm II (NSGA-II, a widely used MOEA in water resources) with five commonly used crossover operators applied to six water distribution system design problems. Results show that the simulated binary crossover (SBX) and the simplex crossover (SPX) operators possess great ability in extending the front and finding Pareto-front solutions, respectively, while the naive crossover (NVX) strategy exhibits the overall worst performance in identifying optimal fronts. The obtained understanding on the operators’ searching behavior not only offers guidance for selecting appropriate operators for real-world water resources problems, but also builds fundamental knowledge for developing more advanced MOEAs in future.

Keywords

Searching behavior Multi-objective optimization NSGA-II Operators Water distribution system 

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Feifei Zheng
    • 1
  • Zhexian Qi
    • 1
  • Weiwei Bi
    • 2
  • Tuqiao Zhang
    • 1
  • Tingchao Yu
    • 1
  • Yu Shao
    • 1
  1. 1.College of Civil Engineering and ArchitectureZhejiang UniversityHangzhouChina
  2. 2.College of Civil Engineering and ArchitectureZhejiang University of TechnologyHangzhouChina

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