ID:
publications-4282
Type:
article
Year:
1997
Authors:
Islam, Mohammad Ashraful and Islam, M. Rashidul and Chaudhry, M. Hanif and Chaudhry, M. Hanif and Clark, Robert M. and Clark, Robert M.
Title:
Inverse Modeling of Chlorine Concentration in Pipe Networks under Dynamic Condition
Venue/Journal:
Journal of Environmental Engineering
DOI:
10.1061/(asce)0733-9372(1997)123:10(1033)
Research type:
Water System:
Technical Focus:
Abstract:
The Surface Water Treatment Rule under the Safe Drinking Water Act and its amendments require that the water utilities maintain a detectable disinfectant residual throughout the distribution system at all times. A new computer model is presented to directly calculate the chlorine concentrations needed at the source(s) to have specified residuals at given locations in a pipe network in unsteady flow conditions by using an inverse method. Unlike the forward solution method, which calculates the source chlorine concentration by a trial-and-error procedure, the inverse solution technique presented in this paper directly calculates the source concentration required to meet a specified value at a particular point in the network. The dynamic flows and pressures are first calculated by solving the governing equations by an implicit finite-difference scheme subject to appropriate boundary conditions. For chlorine concentrations at various pipe sections and at each node, the one-dimensional transport equation is mo...
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