Double diffusion-driven convective instability of three-dimensional fluid-saturated geological fault zones heated from below

Zhao, Chongbin, Hobbs, B. E., Ord, A., Peng, Shenglin, Muhlhaus, H. B. and Liu, Liangming (2005) Double diffusion-driven convective instability of three-dimensional fluid-saturated geological fault zones heated from below. Mathematical Geology, 37 4: 373-391.


Author Zhao, Chongbin
Hobbs, B. E.
Ord, A.
Peng, Shenglin
Muhlhaus, H. B.
Liu, Liangming
Title Double diffusion-driven convective instability of three-dimensional fluid-saturated geological fault zones heated from below
Journal name Mathematical Geology   Check publisher's open access policy
ISSN 0882-8121
1874-8953
1874-8961
1573-8868
Publication date 2005-05
Sub-type Article (original research)
DOI 10.1007/s11004-005-5954-2
Volume 37
Issue 4
Start page 373
End page 391
Total pages 19
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract We conduct a theoretical analysis to investigate the double diffusion-driven convective instability of three-dimensional fluid-saturated geological fault zones when they are heated uniformly from below. The fault zone is assumed to be more permeable than its surrounding rocks. In particular, we have derived exact analytical solutions to the total critical Rayleigh numbers of the double diffusion-driven convective flow. Using the corresponding total critical Rayleigh numbers, the double diffusion-driven convective instability of a fluid-saturated three-dimensional geological fault zone system has been investigated. The related theoretical analysis demonstrates that: (1) The relative higher concentration of the chemical species at the top of the three-dimensional geological fault zone system can destabilize the convective flow of the system, while the relative lower concentration of the chemical species at the top of the three-dimensional geological fault zone system can stabilize the convective flow of the system. (2) The double diffusion-driven convective flow modes of the three-dimensional geological fault zone system are very close each other and therefore, the system may have the similar chance to pick up different double diffusion-driven convective flow modes, especially in the case of the fault thickness to height ratio approaching 0. (3) The significant influence of the chemical species diffusion on the convective instability of the three-dimensional geological fault zone system implies that the seawater intrusion into the surface of the Earth is a potential mechanism to trigger the convective flow in the shallow three-dimensional geological fault zone system.
Keyword Double diffusion
Convective instability
Critical rayleigh number
Geological fault zone
Analytical solution
Q-Index Code C1
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Earth Systems Science Computational Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 6 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Access Statistics: 82 Abstract Views  -  Detailed Statistics
Created: Mon, 13 Aug 2007, 15:22:47 EST