HR: 11:20h
AN: H22C-04    [Abstracts]
TI: Evaluation of Modeling Approaches to Describe Dense Nonaqueous Phase Liquid Dissolution in 3D Heterogeneous Permeability Fields
AU: * Werth, C J
EM: werth@uiuc.edu
AF: University of Illinois at Urbana-Champaign, 205 North Mathews Ave., MC-250, Urbana, IL 61801`, United States
AU: Zhang, C
EM: czhang@uiuc.edu
AF: University of Illinois at Urbana-Champaign, 205 North Mathews Ave., MC-250, Urbana, IL 61801`, United States
AU: Yoon, H
EM: hyoon3@uiuc.edu
AF: University of Illinois at Urbana-Champaign, 205 North Mathews Ave., MC-250, Urbana, IL 61801`, United States
AU: Valocchi, A J
EM: valocchi@uiuc.edu
AF: University of Illinois at Urbana-Champaign, 205 North Mathews Ave., MC-250, Urbana, IL 61801`, United States
AU: Basu, N
EM: nbasu@ufl.edu
AF: University of Florida, PO Box 110290/2169 McCarty Hall, Gainesville, FL 32611, United States
AU: Jawitz, J W
EM: jawitz@ufl.edu
AF: University of Florida, PO Box 110290/2169 McCarty Hall, Gainesville, FL 32611, United States
AB: A suite of approaches was used to simulate dense nonaqueous phase liquid (DNAPL) dissolution from four different three-dimensional (3D) flow cells (25.5 by 9 by 8.5 cm3) packed with one of two spatially correlated random permeability fields, and containing one of two entrapped DNAPL volumes. The approaches are (i) a one- dimensional (1D) model using specific DNAPL-water interfacial areas estimated from magnetic resonance (MR) images of trapped DNAPL, (ii) the same 1D model that incorporates an empirical mass transfer (Sh��) correlation to describe DNAPL dissolution, (iii & iv) both pseudo-steady state and transient versions of the 3D Multiple Analytical Source Superposition Technique (MASST), (v) a distributed streamtube model, and (vi) a 3D sub-grid-block pool dissolution (SGBPD) model. All of these approaches except (ii) require knowledge of the initial DNAPL saturation distribution, and approaches (i) and (iii) require knowledge of the DNAPL saturation distribution at each time step. Only approaches (i) and (vi) consider changes in mass transfer rates due to changes in relative permeability that occur when trapped DNAPL is present. In approach (i) this is accounted for by assuming the total DNAPL-water interfacial area for mass transfer is a simple function of DNAPL saturation, and in approach (vi) this is accounted for by solving the complete 3D flow field using a relative permeability function. In this talk, simulation results will be compared and used to determine trade-offs between model accuracy, data needs, and computational demands
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2007 Joint Assembly