Stochastic Sampling Design for Water Distribution Model Calibration

Behzadian, Kourosh ORCID:, Ardehsir, A, Kapelan, Z and Savic, D (2008) Stochastic Sampling Design for Water Distribution Model Calibration. International Journal of Civil Engineering, 6 (1). pp. 48-57.

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novel approach to determine optimal sampling locations under parameter uncertainty in a water
distribution system (WDS) for the purpose of its hydraulic model calibration is presented. The problem is
formulated as a multi-objective optimisation problem under calibration parameter uncertainty. The objectives
are to maximise the calibrated model accuracy and to minimise the number of sampling devices as a surrogate
of sampling design cost. Model accuracy is defined as the average of normalised traces of model prediction
covariance matrices, each of which is constructed from a randomly generated sample of calibration parameter
values. To resolve the computational time issue, the optimisation problem is solved using a multi-objective
genetic algorithm and adaptive neural networks (MOGA-ANN). The verification of results is done by
comparison of the optimal sampling locations obtained using the MOGA-ANN model to the ones obtained
using the Monte Carlo Simulation (MCS) method. In the MCS method, an equivalent deterministic sampling
design optimisation problem is solved for a number of randomly generated calibration model parameter
samples.The results show that significant computational savings can be achieved by using MOGA-ANN
compared to the MCS model or the GA model based on all full fitness evaluations without significant decrease
in the final solution accuracy.

Item Type: Article
Subjects: Construction and engineering > Civil and environmental engineering
Depositing User: Kourosh Behzadian
Date Deposited: 05 Jan 2022 22:14
Last Modified: 06 Feb 2024 16:08

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