BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:Monitoring\, Management and Control of Water Distribution Networks DTSTART:20161111T101500 DTEND:20161111T111500 DTSTAMP:20260501T020632Z UID:b9c2f59eb39a2370cfb7ff6f5cc627de4ee4aebee5393ae86ab6ea51 CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Shankar Narasimhan\, Indian Institute of Technology Madr as\n\nBio: Career Profile\n\n2000 onwards Professor\nIIT Madras\, Chennai\ n\n1996 - 2000 Associate Professor\nIIT Madras\, Chennai\n\n1994 - 1996 As sociate Professor\nIIT Kanpur\, Kanpur\n\n1988 - 1994 Assistant Professor\ nIIT Kanpur\, Kanpur\n\n1987 - 1988 Post-Doctoral Fellow \nNorthwestern Un iversity\, Evanston\, USA\n\nAcademic Profile\n\nPh.D. (1987)Northwestern University\nEvanston\, USA.\n\nM.S. (1984)Northwestern University\nEvansto n\, USA.\n\nB.Tech. (1982)IIT Madras\nChennai\, India\nWater distribution networks (WDNs) are large scale\, complex systems used for supplying potab le water to consumers. The WDN infrastructure is typically designed to las t more than 50 years. However\, these systems are poorly instrumented and\ , hence\, are neither maintained properly nor operated efficiently. In thi s talk\, three problems of importance in monitoring and efficient operatio n of WDNs will be discussed which can take advantage of increased instrume ntation/automation of these networks. The first problem we discuss is the identification of leaks in WDNs. In India it is estimated that more than 4 0% of the water supplied is lost through leaks. In order to rehabilitate t he system\, the leaking pipes have to be identified and either repaired or replaced. The limited number of instruments available in a network is ins ufficient for this purpose. We present an off-line technique for leak dete ction in WDNs using additional flow measurements. Since the pipes are buri ed underground\, it is required to minimize the number of locations where additional flow measurements have to be made. A multi-stage graph partitio ning approach is used to determine the location of flow measurements\, wit h the objective of minimizing the number of measurements made. The graph p artitioning problem can be formulated as a multi-objective integer linear programming (ILP). We show that a modified spectral bisection method can b e used to derive an approximate solution for large scale networks. The pro posed methods are tested on large scale benchmark networks\, and the resul ts indicate that on flows in less than 3% of the pipes on an average need to be measured to identify the leaky pipe or joint.\n\nThe second problem we discuss is the optimal operation of water networks to minimize energy r equired to meet the demands of consumers. Most WDNs in India are operated intermittently and are equipped with storage reservoirs both within the ne twork (OHTs) as well as at consumer ends. The sequence in which the OHTs a re filled has a significant impact on the time and energy required. The sy stem we consider consists of pumps delivering water to different reservoir s in a network\, with each reservoir catering to a time varying demand. Pu mps and ON/OFF valves are used as manipulated variables to control the flo w rate and delivery pressure. The decision variables are the number of pum ps to be turned on and the state of the valves in the network over a given horizon and the objective is to minimize energy consumption while meeting the time varying demand. Given the nonlinear nature of the pump operating curve and the hydraulics\, the resulting problem is a mixed integer nonli near program (MINLP). Our proposed solution procedure decomposes this prob lem into a series of linear and integer sub-problems that can be solved ef ficiently. Application of these ideas to distribution networks reveals the potential for significant savings in energy or improvement in supply. Imp lementation of the proposed solution requires OHTs to be fitted with level sensors and installation of automatic ON/OFF valves at inlet to the OHTs\ n\nThe third problem we discuss is concerned with the safety of WDNs. WDNs are considered as vulnerable assets that can be attacked by terrorists by introduction of toxic chemical or biological agents into the networks thr ough accessible sources nodes in the network. Online sensors can be locate d at suitable locations in the WDN to detect whether a contaminant has bee n introduced and to identify the source of contamination. Furthermore\, ON /OFF valves can be located in the WDN to prevent the spread of contaminant that may have been introduced. We propose solution techniques based on gr aph theoretic concepts which determine the optimal location of sensor and actuators to minimize the number of sensors and actuators deployed. LOCATION:ME C2 405 https://plan.epfl.ch/theme/generalite_thm_v2?dim_floor= 2&lang=en&dim_lang=en&tree_groups=centres_nevralgiques%2Cacces%2Cmobilite_ reduite%2Censeignement%2Ccommerces_et_services%2Cvehicules%2Cdeveloppem STATUS:CONFIRMED END:VEVENT END:VCALENDAR