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Showing papers in "Ocean Engineering in 2011"


Journal ArticleDOI
TL;DR: Underwater Wireless Sensor Networks (UWSNs) are expected to support a variety of civilian and military applications and can only be interpreted meaningfully when referenced to the location of the sensor, making localization an important problem.

458 citations


Journal ArticleDOI
TL;DR: In this paper, high-damping high-Reynolds VIV was used to convert hydrokinetic energy from ocean/river currents to electricity using the VIVACE Converter.

218 citations


Journal ArticleDOI
TL;DR: In this paper, the authors focused on the shoreline change rate analysis by automatic image analysis techniques using multi-temporal Landsat images and Digital Shoreline Analysis System (DSAS) along the coastal Ramsar wetlands of Turkey.

202 citations


Journal ArticleDOI
TL;DR: In this article, the authors reviewed recent progress in the study of perforated/slotted breakwaters, with an emphasis on two main groups of such breakwaters: (1) perforators with impermeable back walls, and (2) breakwaters without a back-wall.

189 citations


Journal ArticleDOI
TL;DR: In this paper, the VIVACE converter enhances VIV to harness horizontal hydrokinetic energy of water flows, and high Reynolds and high-damping are required to operate VIVAC in ocean/river currents.

175 citations


Journal ArticleDOI
TL;DR: In this paper, an overview of recent developments in geotechnical analysis and design associated with oil and gas developments in deep water is presented, including: new equipment and techniques to characterise the seabed; yield function approaches to evaluate the capacity of shallow skirted foundations; novel anchoring systems for moored floating facilities; pipeline and steel catenary riser interaction with the seafloor; and submarine slides and their impact on infrastructure.

167 citations


Journal ArticleDOI
TL;DR: Passive Turbulence Control (PTC) in the form of selectively distributed surface roughness is used to alter Flow Induced Motion (FIM) of a circular cylinder in a steady flow as mentioned in this paper.

164 citations


Journal ArticleDOI
TL;DR: In this article, two kinds of stress-controlled cyclic triaxial tests were conducted on natural K 0-consolidated Wenzhou clay, and the accumulative behavior was studied; based on the results, a suitable cyclic failure criterion was suggested for natural clays.

148 citations


Journal ArticleDOI
TL;DR: The results show that the fuzzy fault tree risk analysis method (FFTA) is more flexible and adaptive than conventional fault tree analysis for fault diagnosis and hazard estimation of spread mooring systems.

134 citations


Journal ArticleDOI
TL;DR: Several soft computing-based models, namely Support Vector Machines, Bayesian Networks, artificial Neural Networks, Artificial Neural Networks and Adaptive Neuro-Fuzzy Inference System are used for mapping wind data to wave height.

132 citations


Journal ArticleDOI
TL;DR: In this article, an improved method is proposed for coupling a blade element momentum theory inner solution for a horizontal axis tidal turbine with an outer domain flow solved using a commercial finite volume computational Fluid Dynamics solver.

Journal ArticleDOI
TL;DR: A fuzzy approach that takes into account the ship speed evolution and the ship position with respect to maritime shipping lanes is developed and presented, to validate the method and present an example of results with real data.

Journal ArticleDOI
TL;DR: In this article, the Boussinesq equations with the effects of the vegetation being modeled by a quadratic drag law are used to simulate the wave scattering by and the wave propagation through vegetation.

Journal ArticleDOI
TL;DR: A well established frequency domain 3D panel method and a new hybrid time domain Rankine source-Green function method of NTUA-SDL are used to solve the basic seakeeping problem and to calculate first order velocity potentials and the Kochin functions, as necessary for the calculation of the added resistance by Maruo's far-field method.

Journal ArticleDOI
TL;DR: This paper presents an effective and practical method for finding safe passage for ships in possible collision situations, based on the potential field method, which is shown to be effective in automatic ship handling for ships involved in complex navigation situations.

Journal ArticleDOI
TL;DR: In this article, the authors used fiber optic grating strain gages to measure the dynamic response in both cross-flow and in-line directions of a long flexible riser towed horizontally in a wave basin.

Journal ArticleDOI
TL;DR: In this article, a lattice network model is proposed based on the unsaturated flow theory to predict the water penetration into concrete, where the lattice elements are idealized as conductive "pipes" in which unidirectional flow can be realized between the two nodes of the elements.

Journal ArticleDOI
TL;DR: In this article, a VIVACE Converter with virtual elements is used for modeling nonlinear viscous damping, static and dynamic friction, and is verified using monochromatic excitation in air and VIV tests in water using physical damper and springs.

Journal ArticleDOI
TL;DR: The proposed method, known as the single input fuzzy logic controller (SIFLC), reduces the conventional two-input FLC (CFLC) to a single input FLC and offers significant reduction in rule inferences and simplifies the tuning process of control parameters.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated subaerial landslide generated impulse waves in a prismatic wave channel and applied the Stokes wave, cnoidal wave, solitary wave, and bore theories to describe the observed maximum waves.

Journal ArticleDOI
TL;DR: In this article, the forecasting properties of a well-known physics-based model, the European Center for Medium-Range Weather Forecasts (ECMWF) Wave Model, and two statistical techniques, time-varying parameter regressions and neural networks, are compared.

Journal ArticleDOI
TL;DR: In this paper, the authors considered the impact of panel-water hull-water impacts on high-speed craft using the finite element code LS-DYNA and a simplified in-house developed method.

Journal ArticleDOI
TL;DR: In this paper, experimental studies of drag forces on copper alloy net panels are reported, based on which empirical values for normal drag coefficients are proposed for various types of copper netting, and it is shown that copper nets exhibit significantly lower resistance to currents, which corresponds to lower values of drag coefficient.

Journal ArticleDOI
TL;DR: In this article, two different numerical models were used to analyze wave-structure interaction and compute wave loads on bridge superstructures, and the 2D potential flow model was validated by large-scale laboratory measurements, and then used to perform parametric study using a range of wave parameters, water depth and bridge superstructure width.

Journal ArticleDOI
TL;DR: In this article, a series of long numerical simulations are carried out, and their statistical variations are observed for different time windows, and an appropriate criterion and averaging method are proposed for the prediction of added resistance in irregular waves.

Journal ArticleDOI
TL;DR: In this article, the effects of the location and the rotational stiffness of such a flexible line connection on the hydroelastic response of pontoon-type, very large floating structures (VLFS) with a line connection were investigated.

Journal ArticleDOI
TL;DR: In this paper, the authors propose a time-varying model for a streamlined underwater vehicle that explicitly displays the coupling between yaw and pitch motion due to nonzero roll angle and/or roll rate.

Journal ArticleDOI
TL;DR: In this article, the authors present practical frequency-domain estimation algorithms that use constraints on model structure and parameters to refine the search of approximating parametric models, including the influence of radiation model accuracy in force-to-motion models.

Journal ArticleDOI
TL;DR: In this paper, the impact of an elastic wedge-shaped body on a calm free-surface is modeled using a wet modal model, which is then transferred to a rigid-body model to predict the stress field on the fluid-structure interface.

Journal ArticleDOI
TL;DR: In this article, a numerical study was undertaken in order to assess the capability of an unsteady RANS code to predict the seakeeping characteristics of a high-speed multi-hull vessel in high sea states, including evaluation of ship motions, effects of wave steepness on ship response, catamaran natural frequency and added resistance in waves.