Bayesian Framework for Water Quality Model Uncertainty Estimation and Risk Management
Publication: Journal of Hydrologic Engineering
Volume 19, Issue 9
Abstract
A formal Bayesian methodology is presented for integrated model calibration and risk-based water quality management using Bayesian Monte Carlo simulation and maximum likelihood estimation (BMCML). The primary focus is on lucid integration of model calibration with risk-based water quality management and total maximum daily load (TMDL) estimation under conditions of uncertainty. The sources of uncertainty considered in the analysis are modeling errors, observational data errors and fuzziness of the water quality standard. The difference between observed data or transformation thereof and corresponding model response is assumed to follow first-order Markov process, a specific case of which is statistically independent Gaussian errors. The BMCML method starts with sampling parameter sets from prior probability distributions of the model parameters and uses Bayes theorem and the maximum likelihood technique to estimate the triplicate (variance of residual errors, bias and autocorrelation coefficient of total errors) for each parameter set and the corresponding likelihood value. By approximating integration over the entire parameter space discretely, analytical expressions are derived for the cumulative probability distributions of model outputs and probability of violating water quality standards. The solution of the TMDL problem and related margin of safety (MOS) is then framed in the context of the developed Bayesian framework. Three example applications of varying complexities are utilized to demonstrate the versatility of the Bayesian methodology for water quality management. The BMCML methodology is validated using a hypothetical lake-phosphorus model and familiar statistical benchmarks. It is shown that the risk-based framework can estimate the reliability of an arbitrarily selected MOS as demonstrated in the Fork Creek bacteria and Shunganunga Creek dissolved oxygen TMDL case-studies. It is also shown that neglecting covariation among model parameters (i.e., by sampling parameter values from their posterior marginal distributions) influences the estimation of probability of exceedance and could potentially lead to the overestimation of the MOS at low risk levels.
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Acknowledgments
The U.S. Environmental Protection Agency through its Office of Research and Development partially funded and collaborated in the research described here under contract (EP-C-11-006) with Pegasus Technical Services, Inc. It has not been subject to the Agency review and therefore does not necessarily reflect the views of the Agency, and no official endorsement should be inferred.
References
Beven, K. (2006). “A manifesto for the equifinality thesis.” J. Hydrol., 320(1–2), 18–36.
Beven, K., and Binley, A. M. (1992). “The future of distributed models: model calibration and uncertainty prediction.” Hydrol. Proc., 6, 279–298.
Beven, K., and Freer, J. (2001). “Equifinality, data assimilation, and uncertainty estimation in mechanistic modelling of complex environmental systems.” J. Hydrol., 249(1–4), 11–29.
Borsuk, M. E., Stow, C. A., and Reckhow, K. H. (2002). “Predicting the frequency of water quality standard violations: A probabilistic approach for TMDL development.” Environ. Sci. and Tech., 36(10), 2109–2115.
Chapra, S. C., and Tarapchak, S. J. (1976). “A chlorophyll a model and its relationship to phosphorus loading plots for lakes.” Water Resour. Res., 12(6), 1260–1264.
Chin, D. A. (2009). “Risk-based TMDLs in pathogen-impaired waters.” J. Water Resour. Plann. Manage., 521–527.
Dilks, D. W., Canale, R. P., and Meier, P. G. (1992). “Development of Bayesian Monte Carlo techniques for water quality model uncertainty.” Ecol. Model., 62(1–3), 149–162.
Dilks, D. W., and Freedman, P. L. (2004). “Improved consideration of the margin of safety in total maximum daily load development.” J. Environ. Eng., 690–694.
Faulkner, B. R. (2008). “Bayesian modeling of the assimilative capacity component of nutrient total maximum daily loads.” Water Resour. Res., 44(8), W08415.
Gelman, A., Carlin, J. B., Stern, H. S., and Rubin, D. B. (2003). Bayesian data analysis, 2nd Ed., Chapman and Hall, London.
Hahn, G., and Meeker, W. (1991). Statistical intervals: A guide for practitioners, Wiley, New York.
Hantush, M. M. (2009). “Estimation of TMDLs and margin of safety under conditions of uncertainty.” World Environmental and Water Resources Congress 2009: Great Rivers, ASCE, Reston, VA.
Liu, Y., Yang, P., Hu, C., and Guo, H. (2008). “Water quality modeling for load reduction under uncertainty: A Bayesian approach.” Water Res., 42(13), 3305–3314.
Melching, C. S., and Bauwens, W. (2001). “Uncertainty in coupled nonpoint sources and stream water-quality models.” J. Water Resour. Plann. Manage., 403–413.
Neter, J., Wasserman, W., and Kutner, M. H. (1985). Applied linear regression models, Irwin, Homewood, IL.
Novotny, V. (2003). Water quality: Diffuse pollution and watershed management, 2nd Ed., Wiley, New York.
Novotny, V. (2004). “Simplified databased total maximum daily loads, or the world is log-normal.” J. Environ. Eng., 674–683.
National Research Council (NRC). (2001). Assessing the TMDL approach to water quality management, National Academy of Science, Washington, DC.
Patil, A., and Deng, Z. Q. (2011). “Bayesian approach to estimating margin of safety for total maximum daily load development.” J. Environ. Manage., 92(3), 910–918.
Qian, S., Stow, C. A., and Borsuk, M. E. (2003). “On Monte Carlo methods for Bayesian inference.” Ecol. Model., 159(2–3), 269–277.
Reckhow, K. H. (2003). “On the need for uncertainty assessment in TMDL modeling and implementation.” J. Water Resour. Plann. Manage., 245–246.
Shen, J., and Zhao, Y. (2010). “Combined Bayesian statistics and load duration curve method for bacteria nonpoint source loading estimation.” Water Res., 44(1), 77–84.
Shirmohammadi, A. I., et al. (2006). “Uncertainty in TMDL models.” Trans. ASABE, 49(4), 1033–1049.
Sorooshian, S., and Dracup, J. A. (1980). “Stochastic parameter estimation procedures for hydrologic rainfall-runoff models: Correlated and heteroscedastic error cases.” Water Resour. Res., 16(2), 430–442.
U.S. Environmental Protection Agency. (1997). Guidelines for preparation of the comprehensive state water quality assessments, Office of Water, Washington, DC.
U.S. Environmental Protection Agency. (1999). Proposed revisions to the water quality planning and management regulations, proposed rule 40 CFR Part 130, Fed. Reg. 64(162).
U.S. Environmental Protection Agency. (2007). Kansas/lower republican basin total maximum daily load, Waterbody/Assessment Unit: Shunganunga Creek, Water Quality Impairment: Dissolved oxygen.
Vollenweider, R. A., Giovanardi, F., Montanari, G., and Rinaldi, A. (1998). “Characterisation of the trophic conditions of marine coastal waters with special reference to the NW Adriatic Sea: Proposal for a trophic scale, turbidity and generalised water quality index.” Environmetrics, 9, 329–357.
Vrugt, J. A., ter Braak, C. J. F., Gupta, H. V., and Robinson, B. A. (2009). “Equifinality of formal (DREAM) and informal (GLUE) Bayesian approaches in hydrologic modeling?” Stochastic Environ. Res. Risk Assess., 23(7), 1011–1026.
Wang, D., Singh, V. P., Zhu, Y. S., and Wu, J. C. (2009). “Stochastic observation error and uncertainty in water quality evaluation.” Adv. Water Resour., 32(10), 1526–1534.
Zhang, H. X., and Yu, S. L. (2004). “Applying the first-order error analysis in determining the margin of safety for total maximum daily load computations.” J. Environ. Eng., 664–673.
Zheng, Y., and Keller, A. A. (2007). “Uncertainty assessment in watershed-scale water quality modeling and management: 2. Management objectives constrained analysis of uncertainty (MOCAU).” Water Resour. Res., 43(8), W08408.
Zheng, Y., and Keller, A. A. (2008). “Stochastic watershed water quality simulation for TMDL development—A case study in the Newport Bay Watershed.” J. Am. Water Resour. Assoc., 44(6), 1397–1410.
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© 2014 American Society of Civil Engineers.
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Received: Aug 23, 2012
Accepted: Aug 30, 2013
Published online: Sep 2, 2013
Published in print: Sep 1, 2014
Discussion open until: Nov 19, 2014
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