Results 11 to 20 of about 769,052 (322)

An Efficient Ship Detection Method Based on YOLO and Ship Wakes Using High-Resolution Optical Jilin1 Satellite Imagery [PDF]

Sensors
In this study, we propose a practical and efficient scheme for ship detection in remote sensing imagery. Our method is developed using both ship body detection and ship wake detection and combines deep learning and feature-based image processing.
Fangli Mou, Zide Fan, Yunping Ge, Lei Wang, Xinming Li   +4 more
doaj   +2 more sources

Detection Algorithm of Ship Wake in SAR Images

Shanghai Jiaotong Daxue xuebao, 2020
In order to solve the problem of ship wake detection in synthetic aperture radar (SAR) image, a coherent speckle noise suppression algorithm based on analytic dictionary and a wake detection algorithm based on Radon transform are proposed.
ZHAO Ting, WANG Shentao, NIU Lin, XI Peili, CAI Yunze   +4 more
doaj   +2 more sources

Extension of Ship Wake Detectability Model for Non-Linear Influences of Parameters Using Satellite Based X-Band Synthetic Aperture Radar

Remote Sensing, 2019
The physics of the imaging mechanism underlying the emergence of ship wakes in Synthetic Aperture Radar (SAR) images has been studied in the past by many researchers providing a well-understood theory.
Björn Tings, Andrey Pleskachevsky, Domenico Velotto, Sven Jacobsen   +3 more
doaj   +2 more sources

Comparative analysis among different alternative fuels for ship propulsion in a well-to-wake perspective. [PDF]

Heliyon
Zamboni G, Scamardella F, Gualeni P, Canepa E.   +3 more
europepmc   +2 more sources

Breaking of ship bores in a Boussinesq-type ship-wake model

Coastal Engineering, 2018
Abstract A numerical study of ship-induced bores is carried out with a focus on soliton generation in different supercritical regimes, and the transition from breaking solitons to a pure bore measured in Gourlay's (2001) laboratory experiments.
Fengyan Shi, Matt Malej, Jane M. Smith, James T. Kirby   +3 more
openaire   +2 more sources

Ship Wakes: Kelvin or Mach Angle? [PDF]

Physical Review Letters, 2013
From the analysis of a set of airborne images of ship wakes, we show that the wake angles decrease as U(-1) at large velocities, in a way similar to the Mach cone for supersonic airplanes. This previously unnoticed Mach-like regime is in contradiction with the celebrated Kelvin prediction of a constant angle of 19.47° independent of the ship's speed ...
Rabaud, Marc, Moisy, Frederic
openaire   +5 more sources

Study on Kelvin wake scattering characteristics of turning ship

Zhongguo Jianchuan Yanjiu, 2023
ObjectiveThis study focuses on the turning ship Kelvin wake and its electromagnetic scattering characteristics in order to provide a theoretical foundation for the detection and recognition of nonlinear ship wakes.
Jianan YAN, Ding NIE, Min ZHANG
doaj   +1 more source

Hydrographical implications of ship-induced turbulence in stratified waters, studied through field observations and CFD modelling

Frontiers in Marine Science, 2023
Ship-related energy pollution has received increasing attention but almost exclusively regarding radiated underwater noise, while the effect of ship-induced turbulence is lacking in the literature.
Amanda T. Nylund, Ida-Maja Hassellöv, Anders Tengberg, Anders Tengberg, Rickard Bensow, Göran Broström, Martin Hassellöv, Lars Arneborg   +7 more
doaj   +1 more source

In situ observations of turbulent ship wakes and their spatiotemporal extent [PDF]

Ocean Science, 2021
In areas of intensive ship traffic, ships pass every 10 min. Considering the amount of ship traffic and the predicted increase in global maritime trade, there is a need to consider all types of impacts shipping has on the marine environment.
A. T. Nylund, L. Arneborg, A. Tengberg, U. Mallast, I.-M. Hassellöv   +4 more
doaj   +1 more source

Numerical Simulation of the Kelvin Wake Patterns

Applied Sciences, 2022
The ship wave is of great interest for wave drag and coastal erosion. This paper proposes a mechanism of ship wave transformation to explore the effects of ship speed and ship size on the waveform.
Xiaofeng Sun, Miaoyu Cai, Jingkui Wang, Chunlei Liu   +3 more
doaj   +1 more source