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Numerical method of moments for solute transport in a nonstationary flow field conditioned on hydraulic conductivity and head measurements

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Abstract

The unconditional stochastic studies on groundwater flow and solute transport in a nonstationary conductivity field show that the standard deviations of the hydraulic head and solute flux are very large in comparison with their mean values (Zhang et al. in Water Resour Res 36:2107–2120, 2000; Wu et al. in J Hydrol 275:208–228, 2003; Hu et al. in Adv Water Resour 26:513–531, 2003). In this study, we develop a numerical method of moments conditioning on measurements of hydraulic conductivity and head to reduce the variances of the head and the solute flux. A Lagrangian perturbation method is applied to develop the framework for solute transport in a nonstationary flow field. Since analytically derived moments equations are too complicated to solve analytically, a numerical finite difference method is implemented to obtain the solutions. Instead of using an unconditional conductivity field as an input to calculate groundwater velocity, we combine a geostatistical method and a method of moment for flow to conditionally simulate the distributions of head and velocity based on the measurements of hydraulic conductivity and head at some points. The developed theory is applied in several case studies to investigate the influences of the measurements of hydraulic conductivity and/or the hydraulic head on the variances of the predictive head and the solute flux in nonstationary flow fields. The study results show that the conditional calculation will significantly reduce the head variance. Since the hydraulic head measurement points are treated as the interior boundary (Dirichlet boundary) conditions, conditioning on both the hydraulic conductivity and the head measurements is much better than conditioning only on conductivity measurements for reduction of head variance. However, for solute flux, variance reduction by the conditional study is not so significant.

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Acknowledgements

This work was partially funded by the Department of Energy’s Yucca Mountain Project under contract between DOE and the University and Community College System of Nevada, partially funded by NSFC (project number 40272106), and partially funded by the Teaching and Research Award Program for Outstanding Young Teacher (TRAPOYT) of MOE, P.R.C.

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Authors and Affiliations

  1. Department of Earth Sciences, Nanjing University, Nanjing, China

    Jichun Wu & Bill X. Hu

  2. Department of Geological Sciences, Florida State University, Tallahassee, FL, 32306, USA

    Jichun Wu & Bill X. Hu

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  1. Jichun Wu
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  2. Bill X. Hu
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Correspondence to Bill X. Hu.

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Wu, J., Hu, B.X. Numerical method of moments for solute transport in a nonstationary flow field conditioned on hydraulic conductivity and head measurements. Stoch Environ Res Risk Assess 21, 665–682 (2007). https://doi.org/10.1007/s00477-006-0078-x

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  • DOI: https://doi.org/10.1007/s00477-006-0078-x

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