Article
Environmental Sciences
Alexander B. B. Rabinovich, Charles G. G. Hannah, Maxim V. V. Krassovski
Summary: Douglas Channel is the main shipping route between Kitimat and the Pacific Ocean. Accurate prediction of near-surface currents in this area is important for safe tanker navigation and oil spill clean-up. By analyzing three years of current velocity data collected at two moorings, it was found that semidiurnal tidal currents have the greatest influence. The predictability of these currents depends on specific components and varies at different locations within the channel.
Article
Mechanics
Christian Schmitz, Peter F. Pelz
Summary: The paper presents an optimal control strategy for maximizing the extracted mechanical power by controlling the tidal flow through a channel connecting two basins with different tidal regimes. The control strategy is determined as a function of the blockage ratio, s, and is based on the energy equation and the relative volume flow. The results provide a physically consistent generalization of previous research and offer advantages in terms of concise analytical solutions and reduced complexity of the control task for turbine arrays.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Langfeng Zhu, Tianyi Lu, Fan Yang, Bin Liu, Lunyu Wu, Jun Wei
Summary: This study validates the data quality of high-frequency radar data obtained from newly developed radar stations in the Pearl River Estuary through comparison with in situ measurements and model simulations. The results show that the radar data quality is affected by coastlines and algorithms, and a hybrid machine learning approach is needed to improve the data quality.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Marine
Naokazu Taniguchi, Toshiyuki Takahashi, Kengo Yoshiki, Hironori Yamamoto, Aruni Dinan Hanifa, Yuji Sakuno, Hidemi Mutsuda, Sheng-Wei Huang, Chen-Fen Huang, Jen-Hwa Guo
Summary: The study found that reciprocal acoustic transmissions can effectively measure tidal currents, especially high-frequency variations. Results showed that the measurement noise of the estimated currents was small enough to accurately capture variations even with periods considerably shorter than M2 tide, improving the capability to reproduce current velocity fields when inversion or data assimilation methods are applied.
Article
Green & Sustainable Science & Technology
Maxime Thiebaut, Nolwenn Quillien, Antoine Maison, Herveline Gaborieau, Nicolas Ruiz, Seumas MacKenzie, Gary Connor, Jean-Francois Filipot
Summary: Measurements from the Nortek Signature acoustic Doppler current profiler were used to evaluate the kinetic power density, turbulence characteristics, and energy spectra at a tidal energy site. The results showed significant differences in kinetic power density between flood tide and ebb tide, with a strong influence of bathymetry features and headlands on turbulence intensity.
Article
Geosciences, Multidisciplinary
Giovanna Vittori, Paolo Blondeaux
Summary: This article describes the characteristics of bedforms generated by the interaction of tidal currents with a cohesionless sea bottom and reviews different physically based models to predict their features. Ripples, dunes, sand waves, long bed waves, and sand banks are considered, and empirical formulas are suggested whenever possible to predict their geometrical characteristics.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
F. Paquet, I. Thinon, O. Dugue, B. Tessier, M. Benabdellouahed, E. Lasseur, J. Briais, R. Coueffe, P. Guennoc, V. Gaullier
Summary: This study reveals that the troughs in the English Channel are actually composed of two unrelated superimposed networks: an upper network formed during the Pleistocene under low sea-level conditions, and a deeper, older network with unexpected incision depth and complex sedimentary infill. These findings have implications for understanding the origin, age, and development of the troughs in the English Channel.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jacobo Martin, Guadalupe Alonso, Walter Dragani, Jens Meyerjuergens, Ricardo Giesecke, Andrea Cucco, Harold Fenco
Summary: This article analyzes the tidal wave and water flow in the Beagle Channel, based on current and sea-level data. It highlights the narrowness of the channel and its contribution to the eastward surface flow, facilitating the transport of water and properties from the Pacific to the Atlantic. The article also proposes the existence of a semi-permanent sea-level tilt as the main driver for the along-channel current.
JOURNAL OF MARINE SYSTEMS
(2023)
Article
Engineering, Marine
Ahmad Sana, Prerana Chitrakar, Mahad Baawain, Abdullah Al-Mamun
Summary: In this study, ADCPs were deployed along the coast of Oman to collect and analyze wave and current data. The significant wave heights along the coast can reach 2 m, with the southern coast dominated by swells and stronger coastal currents than the northern coast.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Nimal Sudhan Saravana Prabahar, Sam T. Fredriksson, Goran Brostrom, Bjorn Bergqvist
Summary: The representation of tidal energy in future renewable energy systems is expanding, and the design of tidal turbine needs to overcome the limitation of minimum current velocity. The Deep Green (DG) is a kite-borne tidal power plant that can operate efficiently in low tidal current velocities. Numerical modeling of the DG was conducted using large eddy simulations and compared with ADCP measurements. The results showed good agreement, indicating that the ALM/LES modeling of the kite-borne tidal stream turbines is suitable for further optimization studies.
Article
Engineering, Marine
Alyona Naberezhnykh, David Ingram, Ian Ashton
Summary: Understanding turbulence is crucial for tidal energy converter design. Acoustic Doppler Current Profilers (ADCPs) are typically used to analyze turbulence, but Fourier analysis may not fully represent the non-stationary flow turbulence. This study applies wavelet time-frequency analysis to ADCP data and compares it with Fourier methods. Results show that wavelet analysis provides better representation of the turbulence spectrum and coherence characteristics, highlighting the need for such methods to understand fluid flow and tidal energy converters.
Article
Green & Sustainable Science & Technology
Maricarmen Guerra, Alex E. Hay, Richard Karsten, Gregory Trowse, Richard A. Cheel
Summary: In this study, instrumented mobile platforms were used to map the turbulent flows in Grand Passage, one of the Bay of Fundy's energetic tidal channels in Nova Scotia, Canada. The aim was to characterize the flow around the PLAT-I floating tidal energy platform developed by SMEC. The data collected through GPS-tracked surface drifters equipped with ADCPs and vessel-mounted ADCP transects successfully captured the spatial and temporal structure of the flow under different tidal conditions.
Article
Geochemistry & Geophysics
Xiaolei Tu, Michael S. Zhdanov
Summary: Towed streamer electromagnetic (TSEM) survey is an efficient technique for collecting large volumes of EM data rapidly and economically to detect marine HC reservoirs. However, interpreting TSEM data remains a challenging problem. The proposed method of migrating optimal synthetic aperture (OSA) data addresses this issue by iteratively solving the migration problem within the RRCG framework, tested on synthetic models and applied to real TSEM data revealing resistive layers.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Acoustics
Yi Li, Xinhua Chen, Enming Zheng, He Yang
Summary: This paper addresses the issue of signal distortion in the process of locating with towed array and suggests that the coherence bandwidth should be greater than the bandwidth of the source signal. The study shows that the bearing estimation of towed array is more accurate than the range estimation, and proposes a dynamic aperture choosing algorithm based on the target range.
Article
Geosciences, Multidisciplinary
Courtney K. Harris, Jacob T. Wacht, Matthew J. Fair, Jessica M. Cote
Summary: The Ayeyarwady and Thanlwin Rivers in Myanmar are major sources of freshwater and sediment to the ocean. A research cruise in the Gulf of Martaban provided valuable data on sediment dynamics, revealing the importance of tidal straining and bottom nepheloid layer formation in sediment transport.
FRONTIERS IN EARTH SCIENCE
(2022)