In this work, we present a system for the automated classification of seabed substrates in underwater video. Classification of seabed substrates traditionally requires manual analysis by a marine biologist, according to an established classification system. Accurate, consistent and robust classification is difficult in underwater video due to varying lighting conditions, turbidity and method of...

Counting benthic species from sea floor imagery is useful for evaluating the state of the local ecosystem. These images being taken by digital still Cameras mounted on ROVs (Remote Operating Vehicles) are used to capture images of animals on the seabed. The overlap between images must be detected in order to eliminate the possibility of counting the same individual more than once. In order to p...

In passive fathometer processing, the presence of wavelets in the estimate of the medium's Green's function corresponds to the location of reflectors in the seabed; amplitudes are related to seabed properties. Bayesian methods have been successful in identifying reflectors that define layer interfaces. Further work, however, revealed that phase shifts are occasionally present in the wavelets an...

Deepwater subsea wellheads may be significantly threatened under extreme sea conditions and operations, especially when the seabed is composed of very soft clay properties. A numerical model a deepwater wellhead system established using classic ocean pipe element nonlinear spring ANSYS to examine behaviors in diverse soil. Nonlinear elements coded APDL language are used three types soils: soil,...

Seabed methane seepage has gained attention from all over the world in recent years as an important source of greenhouse gas emission, and hydrates are also regarded a key factor affecting climate change or even global warming due to their shallow burial poor stability. However, relationship between seabed hydrate systems is not clear although they often coexist continental margins. It signific...

A solution is developed for the build-up, steady and post-arrest dissipative pore fluid pressure fields that develop around a blunt penetrometer that self-embeds from freefall into the seabed. Arrest from freefall considers deceleration under undrained conditions in a purely cohesive soil, with constant shear strength with depth. The resulting decelerating velocity field is controlled by soil s...

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...

Estimation of seabed geoacoustic parameters in shallow water by remote sensing remains a challenging task due to constraints on hardware, data collection and analysis, and cost of maritime surveys. This work focuses on the application of two techniques that might offer a solution to those constraints: the use of ambient noise to probe the seabed, and Bayesian inversion of these data to estimate...