RESEARCH ADVANCES ON THE CHAIN DISASTERS OF SUBMARINE LANDSLIDES

The problems of deep-water geohazards encountered by human being have become increasingly prominent as the marine resources and energies development has gradually moved into the deep sea. Among them,submarine landslide is the most typical one because it will lead to the chain disasters and seriously endanger the safety of underwater infrastructure. To such end,this paper focuses on the chain disasters process from landslide formation to movement evolution until impact on infrastructures. First of all,the formation mechanism of submarine landslides in response to various triggering factors is briefly reviewed,and the movement process of submarine landslides and the criteria for identifying different evolutionary stages are stated in depth. Then,the mechanism of environmental water and soil coupling action in the process of landslide movement evolution is examined,and a coupled CFD-DEM method applicable to the mesoscale and small scale movement evolution process is proposed. Furthermore,the current application scope and technical bottleneck of the experimental modelling technology,and in-situ monitoring methods of submarine landslide movement evolution process are enough discussed. Based on this,the quantitative evaluation methods and research tools of submarine landslide impact effects are summarized,with a focus on the problem of landslide impact on underwater infrastructure such as submarine pipelines and cables. Finally,the current research deficiencies and future development directions in the subject of submarine landslides,are pointed out to provide a useful reference for simulation,prediction,and early warning of submarine landslide disaster chains.