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An Efficient Full Bayesian Approach for Optimal Sampling Location Design in Groundwater Contaminant Source Identification.

Wednesday, November 6, 2013: 10:20 AM
Tampa Convention Center, Room 20, First Floor

Jiangjiang Zhang, Soil & Water Resources Institute, Zhejiang University, Hangzhou, China, Lingzao Zeng, Soil; & Water Resources Institute, Zhejiang University, Hangzhou, China and Laosheng Wu, University of California-Riverside, Riverside, CA
In this study, an efficient full Bayesian approach was developed for the optimal sampling well design and source identification of groundwater contaminants. An information measure, i.e., the relative entropy, was employed to quantify the information gain from indirect concentration measurement in identifying unknown source parameters including the release time, strength, and location of the contaminant. In the approach, the sampling location which gives the maximum relative entropy was selected as the optimal one. Once the sampling location was determined, a Bayesian approach based on Markov Chain Monte Carlo (MCMC) was used to estimate the unknown source parameters. In both the design and estimation, the contaminant transport equation is required to be solved many times to evaluate the likelihood. To reduce the computational burden, an interpolation based on the adaptive sparse grid was utilized to construct a surrogate for the contaminant transport. The approximated likelihood was evaluated directly from the surrogate. The accuracy and efficiency of this method were demonstrated through numerical case studies. The approach used in this study greatly accelerates the sampling design and parameter estimation processe and the proposed method can be used to assist in monitor network design and identification of unknown contaminant sources.
See more from this Division: SSSA Division: Soil Physics
See more from this Session: General Soil Physics: I

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