On the effective hydraulic conductivity and macrodispersivity for density-dependent groundwater flow

Jiang, Zhenjiao, Raiber, Matthias, Bian, Jianmin, & Cox, Malcolm (2013) On the effective hydraulic conductivity and macrodispersivity for density-dependent groundwater flow. Environmental Fluid Mechanics, pp. 1-15.

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In this paper, semi-analytical expressions of the effective hydraulic conductivity ( KE) and macrodispersivity ( αE) for 3D steady-state density-dependent groundwater flow are derived using a stationary spectral method. Based on the derived expressions, we present the dependence of KE and αE on the density of fluid under different dispersivity and spatial correlation scale of hydraulic conductivity. The results show that the horizontal KE and αE are not affected by density-induced flow. However, due to gravitational instability of the fluid induced by density contrasts, both vertical KE and αE are found to be reduced slightly when the density factor ( γ ) is less than 0.01, whereas significant decreases occur when γ exceeds 0.01. Of note, the variation of KE and αE is more significant when local dispersivity is small and the correlation scale of hydraulic conductivity is large.

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ID Code: 59242
Item Type: Journal Article
Refereed: Yes
Keywords: Spectral Method, Density-dependent Flow, Macrodispersivity, Effective Hydraulic Conductivity
DOI: 10.1007/s10652-013-9281-8
ISSN: 1573-1510
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Springer.
Deposited On: 23 Apr 2013 06:41
Last Modified: 11 Oct 2013 01:06

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