Volume No. 9 Issue No.: 3 Page No.: 634-641 January-March 2015

 

CHLORINE WALL DECAY ESTIMATION FOR WATER DISTRIBUTION NETWORKS UNDER MEASURE -MENTS UNCERTAINTIES

 

Mehdi Dini*1 and Massoud Tabesh2

1. Department of Engineering, Ahar Branch, Islamic Azad University, Ahar, East Ajerbayjan, (IRAN) 2. Centre of Excellence for Engineering and Management of Infrastructures, School of Civil Engineering, College of Engineering, University of Tehran, Tehran (IRAN)

 

Received on : September 10, 2014

 

ABSTRACT

 

Mathematical models of water distribution systems serve as tools to represent the real systems for many different purposes. Calibration is the process of fine tuning the model parameters so that the real system is well represented. Chlorine wall decay coefficients vary between pipes and must be determined indirectly from field measured concentration data. A general calibration model for identifying these parameters is formulated in this paper. The problem is solved using the ant colony optimization algorithm that is coupled with hydraulic and water quality simulation models using the EPANET Toolkit. The methodology is applied to two loop test networks to examine the robustness of the parameter estimation algorithm and to study the effects of the network sampling under measurements certainties and uncertainties. Results show that quantity, quality, location and time of measurement nodes play an important role in chlorine wall decay estimation of water distribution networks under measurements certainties and uncertainties. But wall decay estimation of water distribution networks under measurements uncertainties is more sensitive and needs more location and time of measurement points

 

Keywords : Water distribution, Wall decay coefficient, Ant colony optimization, Measurement, Uncertainty, EPANET Toolkit

 

 

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