The command room system has developed across a century of submarine operations and so reflects a high state of evolution, but that does not mean that the system cannot be improved upon. Technological advances have resulted in the retrospective fitting of upgrades which may not have maximized the potential improvements offered. Future challenges for command teams in almost every domain include i...

We analyze mass-flow tsunami generation for selected areas within the Aleutian arc of Alaska using results from numerical simulation of hypothetical but plausible mass-flow sources such as submarine landslides and volcanic debris avalanches. The Aleutian arc consists of a chain of volcanic mountains, volcanic islands, and submarine canyons, surrounded by a low-relief continental shelf above abo...

1 Department of Subsurface Geobiological Analysis and Research (D-SUGAR), Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan, 2 Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan, 3 Project Team for Development of New-generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth ...

In Intelligence Analysis it is of vital importance to manage uncertainty. Intelligence data is almost always uncertain and incomplete, making it necessary to reason and taking decisions under uncertainty. One way to manage the uncertainty in Intelligence Analysis is Dempster-Shafer Theory [7]. This thesis [4, 5] contains five results regarding multiple target tracks and intelligence specificati...

Improvements in computer hardware and software systems have led to significant opportunities to improve the manner in which submarine cable data is managed and distributed. This is particularly important given the increasing number of cable systems and the increasing importance that submarine cable protection will have on the maintenance of these systems. The “fast track” nature in which these ...

Tsunami is one of the most severe natural disasters faced by regions around the rim of oceans, usually generated by submarine earthquakes (usually with magnitude larger than 7.0), volcano eruptions and large landslides. Submarine earthquakes are the most common tsunami sources. As we know, the prediction of an earthquake is still not satisfactory with today's technologies, in fact, for most ear...

In this paper a numerical model for predicting waves generated by nearshore submarine mass-movements is described. The model is based on the Reynolds averaged Navier–Stokes (RANS) equations with the k2e turbulence model. The volume of fluid (VOF) method is employed to track the free surface. Numerical results obtained from the present model are validated with laboratory experiments and analytic...

The next generation of conventional submarines will be submerged for several weeks, creating a need for regenerative air purification methods and new air monitoring instruments. Submarine air is a complex mixture of compounds, where the most obvious contaminant is metabolically produced carbon dioxide. Normal eight-hour occupational exposure limits are not applicable on a submarine, instead spe...

This paper presents a semi-analytical approximation for a two-dimensional (2D) tension analysis of submarine cables during laying operations. In the analysis, based on geometric compatibility relations and equilibrium equations, a set of non-linear differential equations are obtained. The present model considers effects of ocean currents, cable ship motion, pay-out rate, water depth and materia...

The ocean sciences are beginning a new phase in which scientists will enter the ocean environment and adaptively observe the earth-ocean system using innovative facilities called ocean observatories. This represents a new opportunity for the submarine telecommunications industry, but at the same time presents new challenges, in part because most of the principal design drivers for ocean observa...