ABSTRACT
Sediment gravity flows under water have become an increasingly important subject for research in relation to geomorphodynamics of sediment routing systems that connect river basins, estuaries and coastal oceans. Also, submarine landslides and flow slides have received considerable practical attention in view of their destructive power and associated consequences in nearshore and offshore facilities (Hampton et al. 1996, UNESCO 2009). Fluid-sediment interactions are a key process that features any of subaqueous sediment gravity flows. However, current flow models are mostly depth-averaged and/or rheologically based. Thus they cannot adequately describe the multiphased nature such as pore fluid migration and associated solidification that should occur in the flowing sediments leading to redeposition. Integration of fluiddynamics and soil mechanics approaches is indispensable in advancing the multi-phased physics of subaqueous sediment gravity flows and thereby facilitating a rational analysis framework pertaining to geohazard mitigation.
