Stochastic Flow & Transport in Heterogeneous Soils

Stochastic Characterization & Bayesian Conditioning

Hydrologic Aspects of Hazardous Waste Disposal

Numerical and Stochastic Methods

Dr. Li is investigating new methods for characterizing groundwater contamination at heterogeneous hazardous waste sites, with an emphasis on interactions between simulation models and field data. He is particularly concerned with design of characterization tools which can adapt to complex environmental conditions. Current research focuses on three-dimensional characterization of subsurface contaminated plumes using the nonstationary spectral method recently developed by Li and Mclaughin [Li and Mclaughinlin, WRR 1991; Li, MIT Ph.D. thesis 1993; Li and McLaughin, WRR 1995].

Another related research area is modeling environmental flow and mixing processes in irregular streams. Dr. Li has developed a stochastic approach for modeling irregular streams and applied it for predicting flow resistance in natural rivers [Li et al. JHY1992]. Extension to solute transport and field validation is an area of on-going research.

Dr. Li is also developing accurate and efficient numerical methods for simulating advection-dominated solute transport in surface and subsurface water systems. He has developed and successfully tested a new space-time accurate method by incorporating systematically analytical information in the numerical solutions [Li et al., WRR1992]. Current research includes extending and testing the new method to transient multi-dimensional solute transport in highly variable velocity fields.

• S.G. Li and X.Q. Zhou, " A Stochastic Theory For Irregular Stream Modeling. Part 2: Solute Transport ", Journal of Hydraulic Engineering, ASCE, in press.
• S.G. Li, F. Ruan, D.B. McLaughlin and T. Cole, " A Generalized Analytical Testing Technique for Numerical Models ". Proceedings of International Conference on Computational Methods in Water Resources held in CANCUN, Mexico, July 22-26, Vol. 2, pp.19-26, 1996. An extended version submitted to Numerical Methods in Fluids.
• S.G. Li and D.B. McLaughlin, "Using Nonstationary Spectral Method for Analyzing Groundwater Flow in Heterogeneous Trending Media", Water Resources Research, AGU, No. 3, 1995
• S.G. Li, F. Ruan and D.B. McLaughlin, "Reply to a discussion on A Space-Time Accurate Method for Solving Solute Transport Problems", Water Resources Research, Vol. 30, No.11, 1994.
• S.G. Li and D.B. McLaughlin, "Reply to a discussion on A Stochastic Theory for Irregular Stream Modeling, Part 1: Flow Resistance", Journal of Hydraulic Engineering, ASCE, Vol. 119, No. 11, 1993.
• D.B. McLaughlin, L.B. Reid, S.G. Li and J.A. Hyman, "A Stochastic Method for Characterizing Groundwater Contamination", Journal of Groundwater, March, 1993.
• S.G. Li, F. Ruan and D.B. McLaughlin, "A Space-Time Accurate Method for Solving Solute Transport Problems", Water Resources Research, Vol. 28, No.9, 1992.
• S.G. Li, L. Venkataraman and D.B. McLaughlin, "A Stochastic Theory for Irregular Stream Modeling, Part 1: Flow Resistance", Journal of Hydraulic Engineering, ASCE, Vol. 118, No. 8, 1992.
• S.G. Li and D.B. McLaughlin, "A Nonstationary Spectral Method for Solving Stochastic Groundwater Problems, Part 1: Unconditional Analysis", Water Resources Research, 27(7), 1991.
• S.G. Li and L. Venkataraman, "Discussion on Time-Line Interpolation for the Solution of the Dispersion Equation", Journal of Hydraulic Research, Vol. 29, No. 4, 1991.
• L.B. Reid, D.B. McLaughlin, S.G. Li and J.A. Hyman, "A New Stochastic Method for Characterizing Groundwater Contamination: Application to a Coal Tar Waste Disposal Site", Proceedings of International Hydrology and Water Resources Symposium, 1991.
• S.G. Li, "Theoretical Longitudinal Dispersion Coefficient in Natural Rivers - A Stochastic Approach", Proceedings of XXIII IAHR Congress, Session D: Environmental Hydraulics, 1989.
• S.G. Li, "An Optimal Exponential Difference Scheme for Solving Parabolic Partial Differential Equations", International Journal of Computation and Methodology: Numerical Heat Transfer, Vol. 14, No. 3, 1988.
• S.G. Li and Z.X. Liang, "Gravity-Affected Potential Flows Past Spillway Flip Buckets", Journal of Hydraulic Engineering, ASCE, Vol. 114, No. 4, 1988.

For more information regarding Dr. Li's research send email to shuguang@eas.pdx.edu.

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