Optimal and objective placement of sensors in water distribution systems using information theory. (15th October 2018)

• Record Type: Journal Article
• Authors: Khorshidi, Mohammad S.; Nikoo, Mohammad Reza; Sadegh, Mojtaba
• Is Part Of: Water research. Volume 143(2018)
• Page Start: 218
• Page End: 228
• Publication Date: 2018-10-15
• Subjects: Sensor placement -- Value of information -- Transinformation entropy -- Water distribution system -- Contamination warning system; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2018.06.050
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: Optimization-based deployment of contamination warning system in water distribution systems has been widely used in the literature, due to their superior performance compared to rule- and opinion-based approaches. However, optimization techniques impose an excessive computational burden, which in turn is compensated for by shrinking the problem's decision space and/or using faster optimization algorithms with less accuracy. This imposes subjectivity in interpretation of the system and associated risks, and undermines model's accuracy by not exploring the entire feasible space. We propose a framework that uses information theoretic techniques, including value of information and transinformation entropy, for optimal sensor placement. This can be used either as pre-selection, i.e. pinpointing best potential locations of sensors to be in turn used in optimization framework, or ultimate selection, i.e. single-handedly selecting sensor locations from the feasible space. The proposed framework is then applied to Lamerd water distribution system, in Fars province, Iran, and the results are compared to the suggested potential locations of sensors in previous studies and results of TEVA-SPOT model. The proposed information theoretic scheme enhances the decision space, provides more accurate results, significantly reduces the computational burden, and warrants objective selection of sensor placement. Highlights: Optimal placement of sensors in distribution systems ensures safety of drinking water. Value of Information (VOI) can be used for accurate and robust placement of sensors. VOI enhances the decision space and enables exploring the entire feasible space. Transinformation Entropy (TE) minimizes redundant information from multiple sensors. TE maximizes probability of detecting contamination events.