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Risk-based water quality decision-making under small data using Bayesian network

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Abstract

A knowledge-based network for Section Yidong Bridge, Dongyang River, one tributary of Qiantang River, Zhejiang Province, China, is established in order to model water quality in areas under small data. Then, based on normal transformation of variables with routine monitoring data and normal assumption of variables without routine monitoring data, a conditional linear Gaussian Bayesian network is constructed. A “two-constraint selection” procedure is proposed to estimate potential parameter values under small data. Among all potential parameter values, the ones that are most probable are selected as the “representatives”. Finally, the risks of pollutant concentration exceeding national water quality standards are calculated and pollution reduction decisions for decision-making reference are proposed. The final results show that conditional linear Gaussian Bayesian network and “two-constraint selection” procedure are very useful in evaluating risks when there is limited data and can help managers to make sound decisions under small data.

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Authors and Affiliations

  1. Institute of Hydrology and Water Resources, Civil Engineering, Zhejiang University, Hangzhou, 310058, China

    Qing-qing Zhang  (张庆庆), Yue-ping Xu  (许月萍), Ye Tian  (田烨) & Xu-jie Zhang  (张徐杰)

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  1. Qing-qing Zhang  (张庆庆)
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  2. Yue-ping Xu  (许月萍)
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  3. Ye Tian  (田烨)
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  4. Xu-jie Zhang  (张徐杰)
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Corresponding author

Correspondence to Yue-ping Xu  (许月萍).

Additional information

Foundation item: Project(50809058) supported by the National Natural Science Foundation of China

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Zhang, Qq., Xu, Yp., Tian, Y. et al. Risk-based water quality decision-making under small data using Bayesian network. J. Cent. South Univ. 19, 3215–3224 (2012). https://doi.org/10.1007/s11771-012-1398-2

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  • DOI: https://doi.org/10.1007/s11771-012-1398-2

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