Results 91 to 100 of about 50,747 (268)

Enigmatic Deep-Water Mounds on the Orphan Knoll, Labrador Sea

Frontiers in Marine Science, 2020
Deep-sea mounds can have a variety of origins and may provide hard-substrate features in depths that are normally dominated by mud. Orphan Knoll, a 2 km high bedrock horst off northeast Newfoundland, hosts more than 200 mounds, or mound complexes, of ...
Shawn P. Meredyk, Evan Edinger, Evan Edinger, David J. W. Piper, Veerle A. I. Huvenne, Shannon Hoy, Shannon Hoy, Alan Ruffman   +7 more
doaj   +1 more source

Automatic Detection of Trawl-Marks in Sidescan Sonar Images through Spatial Domain Filtering, Employing Haar-Like Features and Morphological Operations

Géosciences, 2019
Bottom trawl footprints are a prominent environmental impact of deep-sea fishery that was revealed through the evolution of underwater remote sensing technologies.
Charikleia Gournia, E. Fakiris, M. Geraga, David P. Williams, G. Papatheodorou   +4 more
semanticscholar   +1 more source

Incipient Subduction and Slip Partitioning at High Obliquity: The Haida Gwaii Plate Boundary

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 5, May 2024.
Abstract Plate motion obliquity along the dominantly transform Queen Charlotte plate boundary (QCPB) peaks offshore Haida Gwaii. To investigate the effects of obliquity on plate boundary deformation, we analyze continuous seismic waveforms from temporary and permanent stations from 1998 to 2020 to generate a catalog of ∼50,000 earthquakes across Haida ...
S. J. Oliva, M. G. Bostock, A. J. Schaeffer, E. Nissen, R. Merrill, A. Hughes, S. W. Roecker, M. R. Nedimovic, E. Roland, L. L. Worthington, M. A. L. Walton, A. Gase   +11 more
wiley   +1 more source

RT-Seg: A Real-Time Semantic Segmentation Network for Side-Scan Sonar Images

Sensors, 2019
Real-time processing of high-resolution sonar images is of great significance for the autonomy and intelligence of autonomous underwater vehicle (AUV) in complex marine environments.
Qi Wang, Meihan Wu, Fei Yu, Chen Feng, Kaige Li, Yuemei Zhu, Eric Rigall, Bo He   +7 more
doaj   +1 more source

A fully‐automatic side‐scan sonar simultaneous localization and mapping framework

IET Radar, Sonar &Navigation, Volume 18, Issue 5, Page 674-683, May 2024.
The authors propose a feature‐based SLAM framework using side‐scan sonar, which is able to automatically detect and robustly match keypoints between paired side‐scan images, and served as constraints to refine the AUV pose trajectory from raw dead‐reckoning system. Abstract Side‐scan sonar is a lightweight acoustic sensor that is frequently deployed on
Jun Zhang, Yiping Xie, Li Ling, John Folkesson   +3 more
wiley   +1 more source

Bathymetric LiDAR and Semi‐Automated Feature Extraction Assist Underwater Archaeological Surveys

Archaeological Prospection, Volume 31, Issue 2, Page 171-186, April/June 2024.
ABSTRACT Critical data concerning key developments in global human history now lie submerged on continental shelves where investigations confront significant challenges. Whereas underwater excavations and surveys are expensive and weather dependent and require specialized training and equipment, remote sensing methods can improve chances for success ...
Dylan S. Davis, Jessica W. Cook Hale, Nathan L. Hale, Trevor Z. Johnston, Matthew C. Sanger   +4 more
wiley   +1 more source

Providing the Third Dimension: High-resolution Multibeam Sonar as a Tool for Archaeological Investigations - An Example from the D-day Beaches of Normandy [PDF]

, 2003
In general, marine archaeological investigations begin in the archives, using historic maps, coast surveys, and other materials, to define submerged areas suspected to contain potentially significant historical sites.
Calder, Brian R., Malzone, C, Mayer, Larry A., Schmidt, J S   +3 more
core   +1 more source

Exploring the impact of spatial patterns on restoration efforts: promoting self‐facilitating feedback mechanisms with an innovative biodegradable seed mussel collector

Restoration Ecology, Volume 32, Issue 3, March 2024.
Transplantations of organisms in aquatic ecosystems play an important role in ecological restoration and commercial practices. However, success rates of these transplantations, especially when ecosystem engineers are involved, are often low. To enhance transplantation success, the promotion of self‐facilitation between transplants that mitigate ...
Lisanne A. van den Bogaart, Jacob J. Capelle, Jildou Schotanus, Tjeerd J. Bouma   +3 more
wiley   +1 more source

Establishing a Multibeam Sonar Evaluation Test Bed near Sidney, British Columbia [PDF]

, 2012
The Canadian Hydrographic Service (CHS), Naval Oceanographic Office (NAVOCEANO) and the Ocean Mapping Group of the University of New Brunswick (OMG) collaborated on establishing a multibeam sonar test bed in the vicinity of the Institute of Ocean ...
Beaudoin, Jonathan, Clarke, J.E. Hughes, Hare, Rob, Whittaker, Clay   +3 more
core   +2 more sources

Temporal variability of gas seeps offshore New Zealand: multi-frequency geoacoustic imaging of the Wairarapa area, Hikurangi margin [PDF]

, 2010
Cold seeps on Opouawe Bank, situated in around 1000 m water depth on the Hikurangi Margin offshore North Island. New Zealand, were investigated using multibeam bathymetry, 75 and 410 kHz sidescan sonar imagery, and 2–8 kHz Chirp sediment echosounder data.
Augustin, Avdeyko, Baco-Taylor, Barnes, Barnes, C. Joerg Petersen, Carter, Clift, David Bowden, Egorov, Greinert, Greinert, Haeckel, Henrys, Hovland, Huguen, Ingo Klaucke, Johnson, Katz, Klaucke, Klaucke, Langseth, Le Bas, Ledesert, Leifer, Lewis, Lewis, Luff, MacDonald, MacDonald, Naudts, Netzeband, Obzhirov, Paull, Pecher, Pettinga, Ranero, Ridd, Sager, Sahling, Solomon, Stoll, Teichert, Townend, Tryon, Tryon, Wilhelm Weinrebe   +46 more
core   +1 more source