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Addressing Non-uniqueness in Source Characterization for Multiple Contaminant Source Scenarios in Water Distribution Sys

Outline. IntroductionObjectivesMethodologyResultsObservationsOngoing/future work. Introduction. Contamination threat problem in a water distribution systemCause short term chaos and long term issuesDiversionary action to cause service outageReduction in fire fighting capacityDistract publ

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Addressing Non-uniqueness in Source Characterization for Multiple Contaminant Source Scenarios in Water Distribution Sys

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    1. Addressing Non-uniqueness in Source Characterization for Multiple Contaminant Source Scenarios in Water Distribution Systems Jitendra Kumar1, Emily M. Zechman1, E. Downey Brill1, Jr., G. Mahinthakumar1, S. Ranjithan1, James Uber2 1North Carolina State University, Raleigh, NC 2University of Cincinnati , Cincinnati, OH

    2. Outline Introduction Objectives Methodology Results Observations Ongoing/future work

    3. Introduction Contamination threat problem in a water distribution system Cause short term chaos and long term issues Diversionary action to cause service outage Reduction in fire fighting capacity Distract public & system managers Non-uniqueness in source characterization problem

    4. contd… Under a contamination event, multiple contaminant sources may be placed in the network The number of sources will remain unknown to a decision maker Non-uniqueness present in a multiple-source identification scenario is expected to increase due to an increased number of possible solutions

    5. Resolving non-uniqueness Underlying premise In addition to the “optimal” solution, identify other “good” solutions that fit the observations Are there different solutions with similar performance in objective space? Search for alternative solutions

    6. Objectives Identify possible multiple sources in during a contamination event Investigate and quantify non-uniqueness under different scenarios

    7. Simulation-optimization approach Mathematical formulation Find Source location [L(x,y)] Contaminant loading profile [Mt, Ts]

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