23-25 September 2013
GEOMAR East shore
Europe/Berlin timezone
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Mass movement prediction of submarine landslide in the South China Sea Liwan 3-1 gas field

Presented by Dr. zongxiang XIU on 23 Sep 2013 from 17:15 to 19:15
Type: Poster presentation
Session: Poster session

Content

A submarine slope at the head part of the submarine valley in the South China Sea Liwan 3-1 gas field is taken as an example for the mass movement prediction of submarine landslide in this area. Firstly, the FEM strength reduction method is used for submarine slope stability analysis, and then the height and length of the potential submarine landslide can be obtained. The travel distance of the moved mass is predicted with Computational Fluid Dynamics method, in which the dynamic interaction between moved soil and sea water is simulated by the Eulerian-Eulerian two-phase model. Considering that the soil strength may be gradually decreasing during the movement, we develop an equivalent parameters method to simulate mass movement. The Herschel - Bulkley rheological model is chosen to simulate the soil, and the rheological parameters are obtained by a series of submarine landslide back-calculations. The submarine landslides which have been chosen for back-calculations are identified in the adjacent area based on the multibeam data and seismic cross-section, and they have similar size and soil properties with the potential ones. Finally, the stability safety factor of the target slope and the corresponding travel distance of moved mass are obtained.

Place

Location: GEOMAR East shore
Address: Wischhofstr. 1-3 / D-24148 Kiel
Room: Lithothek

Primary authors

  • Dr. zongxiang XIU The First Institute of Oceanography, State Oceanic Administration,P.R.China
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Co-authors

  • Dr. lejun LIU The First Institute of Oceanography, State Oceanic Administration,P.R.China
  • Dr. xishuang LI The First Institute of Oceanography, State Oceanic Administration,P.R.China
  • Dr. tianyun SU The First Institute of Oceanography, State Oceanic Administration,P.R.China
  • Dong WANG The first institute of Oceanography, State Oceanic Administration, P. R. China
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