Patterned ground formation and penetrative convection in porous media
作者:
J.H. George,
R.D. Gunn,
B. Straughan,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1989)
卷期:
Volume 46,
issue 3
页码: 135-158
ISSN:0309-1929
年代: 1989
DOI:10.1080/03091928908208908
出版商: Taylor & Francis Group
关键词: Penetrative convection;porous media;pattern formation;polygonal stone nets
数据来源: Taylor
摘要:
A theoretical explanation is advanced consisting of a five stage process for the formation of polygonal ground which consists of stone borders forming regular hexagons and soil centres. One of these stages, namely the onset of convection in a porous soil between temperatures of 0°C and approximately 4-6°C, is studied analytically. Darcy's law is employed but variable permeability is allowed for and a parabolic density dependence on temperature is assumed. It is found that the theoretical predictions of the aspect ratio agree very well with field studies when a constant upper surface heat flux condition is imposed and an upwardly stratified permeability is chosen. Field study data, which agree very well with the theory, are reported in detail.
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