Novel and synthetic mooring tethers can enable tuning of a floating wind turbine’s system stiffness behaviour, eliciting specific desirable response load characteristics potential cost reductions. This paper presents the results detailed coupled dynamic simulations considering IEA 15 MW turbine VolturnUS-S semi-submersible reference platform deployed in Celtic Sea. The influence novel on anchor...

A pressure sensor, located for four months in the middle of a 1275 m-long taut deep-ocean mooring 2380 m water depth above seamount with sub-surface top-buoys and seafloor anchor-weight, demonstrates narrow-band spectral peaks deterministic well-predictable signals equivalent 0.5 amplitudes at uncommon sub-harmonic frequencies f*/4, f*/2, 3f*/4 local near-inertial frequency f* = 1.085f, where f...

The energy flux in internal waves generated at the Celtic Sea shelf break was estimated by (i) applying perturbation theory to a weeklong dataset from a mooring at 200m depth, and (ii) using a 2D non-hydrostatic circulation model over the shelf break. The dataset consisted of high resolution time-series of currents and vertical stratification together with two 25-h sets of vertical profiles of ...

Sinking Particles and Pelagic Food Webs in the SE Bering Sea: 1997-2002 Susan M. Henrichs and Stacy Smith, School of Fisheries and Ocean Sciences, UAF The southeastern Bering Sea shelf is an economically and ecologically important system that is subject to substantial natural and human-induced change (National Research Council, 1996). Despite this, long term observations are limited and fragmen...

In this paper, the focused wave and current interaction with a moored JIP Spar platform are investigated using a time-domain higher order boundary element method (THOBEM). Embodied by a linear superposition of finite cosine waves, the focused wave can be efficiently simulated through adjusting the initial phase of cosine wave and adding corrected wave. The finite element method is used to simul...

This paper investigates the impact of arrival processes on the ship handling process. Two types of arrival processes are considered: controlled and uncontrolled. Simulation results show that uncontrolled arrivals of ships perform worst in terms of both ship delays and required storage capacity. Stock-controlled arrivals perform best with regard to large vessel delays and storage capacity. The c...

We encountered a rare case of suffocation by an advertising balloon filled with pure helium gas. Suffocation caused by inhalation of atmosphere lacking in oxygen is not exceptional, but reports of death by suffocation due to a pure inert gas such as helium are very rare. In this case, the balloon mooring on the ground was enclosed, warning signs were displayed, and it was clear that entering th...