CGRG Bibliography of Canadian Geomorphology
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Author : Grozic, J.H.L.
Date : 2003.
Title : Gas hydrates and submarine slope instability.
Publication : 3rd Canadian Conference on Geotechnique and Natural Hazards. Sheraton Hotel. Edmonton, Alberta, Canada. June 9 and 10, 2003.
Issue :
Page(s) :
Abstract
Gas hydrates are ice-like materials composed of water molecules that encapsulate natural gas molecules in a very compact form. Vast quantities of natural gas hydrates exist within soil and rock in permafrost environments and offshore regions. Gas hydrates represent a significant geohazard that place offshore facilities, structures, and cables at considerable risk of damage. There is substantial evidence that links major seafloor collapses to the presence of gas hydrates. Analyses of reported cases of submarine slides occurring on gentle slopes indicate that the slide scar is either at the top of the hydrate zone or at the base of the hydrate layer. In addition, theoretical and laboratory evidence that shows the soil will experience a dramatic reduction in shear strength due to gas hydrate dissociation (melting), which may ultimately lead to soil collapse and triggering of submarine slope failures. This paper will summarize the properties of gas hydrates and highlight their role in submarine slope instability.
Bibliography of Canadian Geomorphology