Results 71 to 80 of about 19,886 (166)

Mapping and Characterizing Subtidal Oyster Reefs Using Acoustic Techniques, Underwater Videography and Quadrat Counts [PDF]

, 2003
Populations of the eastern oyster Crassostrea virginica have been in long-term decline in most areas. A major hindrance to effective oyster management has been lack of a methodology for accurately and economically obtaining data on their distribution and
Adams, J R, Dijkstra, Semme J., Grizzle, Raymond E, Smith, Brian, Ward, R W   +4 more
core   +1 more source

Dual Frequency Side Scan Sonar Image Fusion for Deep‐Learning Based Underwater Target Detection

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
Traditional single‐frequency side‐scan sonar faces trade‐offs between imaging resolution and detection range, along with issues such as speckle noise and target–shadow coupling. To address these, this study proposes D2FNet, a dual‐domain fusion model integrating three key modules, which—tested on a new dataset of over 9000 paired sea‐trial images ...
Jiajun Xian, Liming Li, Fan Zhang, Yingying Wu, Weilin Zang, Lingji Xu, Hongxun Yao, Adam Rushworth, Johannes Michael Herrmann, Sanming Song   +9 more
wiley   +1 more source

Applicability of Traditional Acoustic Technology for Underwater Archeology: A Case Study of Model Detection in Xiamen Bay

Acoustics
This study addresses the applicability of conventional marine acoustic technologies for detecting non-metal artifacts. Based on the typical environment in Xiamen Bay, we evaluated the detection efficacy of common multibeam sonar, side-scan sonar, and sub-
Xudong Fang, Jianglong Zheng, Shengtao Zhou, Zepeng Huang, Boran Liu, Ping Chen, Jiang Xu   +6 more
doaj   +1 more source

Development of a 2 MHz Sonar Sensor for Inspection of Bridge Substructures

Sensors, 2018
Hydraulic factors account for a large part of the causes of bridge collapse. Due to the nature of the underwater environment, quick and accurate inspection is required when damage occurs.
Chul Park, Youngseok Kim, Heungsu Lee, Sangsik Choi, Haewook Jung   +4 more
doaj   +1 more source

Automated, objective texture segmentation of multibeam echosounder data - Seafloor survey and substrate maps from James Island to Ozette Lake, Washington Outer Coast [PDF]

, 2007
Without knowledge of basic seafloor characteristics, the ability to address any number of critical marine and/or coastal management issues is diminished. For example, management and conservation of essential fish habitat (EFH), a requirement mandated by
Beaudoin, Jonathan D., Cutter, George R., Intelmann, Steven S.   +2 more
core  

Bridging Ecology and Geosciences in Riverscapes: Implications for Process‐Based Restoration

Ecological Research, Volume 41, Issue 1, January 2026.
In this paper, we synthesize studies that integrally examine geological and ecological processes across different scales and components of riverscapes, including geohydrological processes. Finally, we identify both scientific and practical challenges that must be addressed to bridge the gap between basic‐science implications and their implementation in
Hiromi Uno, Hikaru Nakagawa, Nobuo Ishiyama, Masaru Sakai, Terutaka Mori, Akira Terui, Eric A. Scholl, Ellen Wohl, Colden V. Baxter   +8 more
wiley   +1 more source

Detecting fish aggregations from reef habitats mapped with high resolution side scan sonar imagery [PDF]

, 2006
As part of a multibeam and side scan sonar (SSS) benthic survey of the Marine Conservation District (MCD) south of St. Thomas, USVI and the seasonal closed areas in St. Croix—Lang Bank (LB) for red hind (Epinephelus guttatus) and the Mutton Snapper (MS) (
Arsenault, Jean-Luc, Benoit, Nicolas, Moody, Gary, Prada, Martha C., Rivera, Jose A.   +4 more
core  

Combining morphological and molecular data to study past foraminiferal communities from a temperate coastal sediment core

Boreas, Volume 55, Issue 1, Page 198-215, January 2026.
This paper presents the results of a dual approach for assessing fossil benthic foraminiferal communities using both traditional morphology‐based analyses and sedimentary ancient DNA (sedaDNA) metabarcoding. The main objectives are to test the feasibility of sedaDNA analyses to assess foraminiferal biodiversity in temperate shelf sediments (Le Croisic,
Meryem Mojtahid, Magali Schweizer, Damien Le Moigne, Gwendoline Grégoire, Anne  Murat, Isabelle Poirier, Agnès Baltzer, Inge van Dijk, Marie‐Christine Morère‐Le Paven, Martin Bourges, Maria Pia Nardelli, Christine Barras, Edouard Metzger, Aurelia Mouret   +13 more
wiley   +1 more source

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

IET Radar, Sonar & Navigation
Side‐scan sonar is a lightweight acoustic sensor that is frequently deployed on autonomous underwater vehicles (AUVs) to provide high‐resolution seafloor images.
Jun Zhang, Yiping Xie, Li Ling, John Folkesson   +3 more
doaj   +1 more source

The Rise of Certificate Transparency and Its Implications on the Internet Ecosystem

, 2018
In this paper, we analyze the evolution of Certificate Transparency (CT) over time and explore the implications of exposing certificate DNS names from the perspective of security and privacy.
Amann, Johanna, Brent, Lexi, Carle, Georg, Gasser, Oliver, Holz, Ralph, Nolte, Theodor, Scheitle, Quirin, Schmidt, Thomas C., Wählisch, Matthias   +8 more
core   +1 more source