FN Archimer Export Format
PT J
TI Effect of gas hydrates melting on seafloor slope instability
BT 
AF SULTAN, Nabil
   COCHONAT, Pierre
   FOUCHER, Jean-Paul
   MIENERT, J
AS 1:;2:;3:;4:;
FF 1:PDG-DOP-DCB-GM-LES;2:PDG-DPS;3:PDG-DOP-DCB-GM-LGG;4:;
C1 IFREMER Brest, Dept Geosci Marines, F-29280 Plouzane, France.
   Univ Tromso, N-9001 Tromso, Norway.
C2 IFREMER, FRANCE
   UNIV TROMSO, NORWAY
SI BREST
   SIEGE
SE PDG-DOP-DCB-GM-LES
   PDG-DPS
   PDG-DOP-DCB-GM-LGG
IN WOS Ifremer jusqu'en 2018
IF 1.818
TC 314
UR https://archimer.ifremer.fr/doc/2004/publication-699.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
BO Marion Dufresne
DE ;Storegga;Slope failure;GLE;Finite difference;Methane hydrate
AB We present a theoretical study of the thermodynamic chemical equilibrium of gas hydrate in soil by taking into account the influence of temperature, pressure, pore water chemistry, and the mean pore size distribution. The model uses a new formulation based on the enthalpy form of the law of conservation of energy. The developed model shows that due to a temperature and pressure increase, hydrates may dissociate at the top of the hydrate occurrence zone to ensure a chemical equilibrium with the surrounding bulk water. This original result confirms what has been already shown through experiments. The second part of the paper presents an application of the model through a back-analysis of the giant Storegga Slide on the Norwegian margin. Two of the most important changes during and since the last deglaciation (hydrostatic pressure due to the change of the sea level and the increase of the sea water temperature) were considered in the calculation. Simulation results show that melting of gas hydrate due to the change of the gas solubility can be at the origin of a retrogressive failure initiated at the lower part of the Storegga slope. Once again, the developed model leads to predictions, which are supported by laboratory experiment results, but contradictory to previous interpretations and beliefs considering that hydrate dissociation occurs only at the bottom of the gas hydrate stability zone.
PY 2004
PD DEC
SO Marine Geology
SN 0025-3227
PU Elsevier
VL 213
IS 1-4
UT 000226172800016
BP 379
EP 401
DI 10.1016/j.margeo.2004.10.015
ID 699
ER

EF