Seismic-induced pore pressure and effective stresses in the saturated porous seabed under seismic loading are the main factors that govern the overall stability of submarine pipelines. In most of the previous investigations for the seismic-induced dynamic response around a submarine pipeline have been limited to two-dimension cases. In this paper, a three-dimensional finite element model includ...

JAMSTEC now has been developing several underwater platforms includes underwater vehicles as the useful tool to deal with various issues relating to the deep ocean. It is required that they are equipped with observation sensors to visualize deep-seabed including topography and benthic organism. One of methods to realize that is a stereo vision system. It can provide not only the 3D shape and co...

The seabed can be classified using data from vertical, split-beam echosounders. This was demonstrated recently using amodel parameterized with acoustic estimates of slope, roughness, normal-incidence backscattering strength, and variation of backscattering strength by frequency and incidence angle. These seabed classifications were interpreted and validated using published surficial geology map...

The action of water waves moving over a porous seabed drives a seepage ̄ux into and out of the marine sediments. The volume of ̄uid exchange per wave cycle may a€ect the rate of contaminant transport in the sediments. In this paper, the dynamic response of the seabed to ocean waves is treated analytically on the basis of poro-elastic theory applied to a porous seabed. The seabed is modelled as ...

The theory of belief functions in discrete domain has been employed with success for pattern recognition. However, the Bayesian approach performs well provided that once the probability density functions are well estimated. Recently, the theory of belief functions has been more and more developed to the continuous case. In this paper, we compare results obtained by a Bayesian approach and a met...

There is a need for fit-for-purpose maps for accurately depicting the types of seabed substrate and habitat and the properties of the seabed for the benefits of research, resource management, conservation and spatial planning. The aim of this study is to determine whether it is possible to predict substrate composition across a large area of seabed using legacy grain-size data and environmental...

We present a weakly nonlinear theory for the evolution of dispersive transient waves generated by moving seabed deformation. Using perturbation expansion up to second order, we show that higher-order components affect mostly leading wave and region close deforming seabed. In particular, in regime has higher crests deeper troughs than known linear solution, while trough propagates together with ...