ID:
publications-4581
Type:
article
Year:
2001
Authors:
Tanyimboh, Tiku T. and Tanyimboh, Tiku T. and Kalungi, Paul and Kalungi, Paul and Xu, Chengchao and Xu, Chengchao and Goulter, I. C. and Goulter, Ian C.
Title:
Reliability-Based Optimal Design of Water Distribution Networks
Venue/Journal:
Journal of Water Resources Planning and Management
DOI:
10.1061/(asce)0733-9496(2001)127:4(278)
Research type:
Water System:
Technical Focus:
Abstract:
A new approach for reliability-based optimization of water distribution networks is presented. The approach is capable of recognizing the uncertainty in nodal demands and pipe capacity as well as the effects of mechanical failure of system components. A probabilistic hydraulic model is used in the model to account for uncertainty in nodal demands and pipe capacity. The primary innovation of the model is the use of a first-order reliability-method-based algorithm to compute approximate values of the capacity reliability of water distribution networks. Capacity reliability is defined as the probability that the nodal demand is met \Iat or over\N the prescribed minimum pressure for a fixed network configuration under random nodal demands and random pipe roughnesses. The model also incorporates a strategy for identifying the critical nodes on which the reliability constraints are imposed in the cost minimizing step. The computational efficiency of the optimization is shown to be enhanced by deriving the first-order derivatives analytically using a sensitivity-analysis-based technique. The efficiency and capacity of the proposed algorithm are illustrated by application to two sample networks.
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