Results 71 to 80 of about 1,785,299 (250)

Dumpsite Seabed Characterization of the San Pedro Basin, CA, From Autonomous Vehicle Observations

Journal of Field Robotics, EarlyView.
ABSTRACT A wide‐area seabed survey was conducted using autonomous underwater vehicles (AUVs) in a known dumpsite off the coast of Southern California that has been found to have widespread sediment contamination from the chemical dichlorodiphenyltrichloroethane (DDT).
Ryan A. McCarthy, Dylan Kriegman, Sophia T. Merrifield, Heidi Batchelor, Eric J. Terrill   +4 more
wiley   +1 more source

Application of a Presumptive Standards Approach to Evaluate Environmental Flows in a Highly Regulated River Basin

River Research and Applications, EarlyView.
ABSTRACT The presumptive standards approach to environmental flows offers a method to develop interim guidelines for ecological and social‐cultural flow needs. The approach is based on deriving acceptable percent‐of‐flow limits based on naturalised flows (the absence of depletion or alteration of flow), and it can be an effective precursor to a full ...
Jennifer Lento, Wendy A. Monk, Fuad Yassin, Mustakim Ali, Hayley Carlson, Saman Razavi, Timothy D. Jardine   +6 more
wiley   +1 more source

Effects of hypoxia on benthic macrofauna and bioturbation in the Estuary and Gulf of St. Lawrence, Canada [PDF]

, 2010
The bottom water in the 4300 m deep Lower St. Lawrence Estuary (LSLE) is persistently hypoxic in contrast to the normoxic bottom waters in the Gulf of St. Lawrence (GSL). We photographed the seabed at 11 stations in the Estuary and Gulf of St.
Gagnon, Jean-Marc, Sundby, Bjorn, Belley, Rénald, Gilbert, Franck, Archambault, Philippe   +4 more
core   +1 more source

The Role of Sediment Supply on Fish Habitat Dynamics of a Morphologically Active River Widening

River Research and Applications, EarlyView.
ABSTRACT Restoration measures, such as river widening, aim to reactivate key morphodynamic processes, which are critical drivers of fluvial habitat dynamics. While some evidence supports the important role of sediment supply on river widening's morphology, its link to fish habitat availability and dynamics remains unclear.
Mahmoud O. M. Awadallah, Francesco Caponi, David F. Vetsch, Robert M. Boes, Davide Vanzo   +4 more
wiley   +1 more source

Integration of Agisoft Metashape and eCognition for Mapping Mangrove Ecosystems and Benthic Habitats Using UAV Technology

Jurnal Ilmiah Platax
Accurate mapping of coastal ecosystems is essential for marine resource management and biodiversity conservation. This study integrates UAV (Unmanned Aerial Vehicle) technology, Agisoft Metashape photogrammetry, and Object-Based Image Analysis (OBIA ...
Adnan S. Wantasen, Wilmy E. Pelle, Alex. D. Kambey, Ari B. Rondonuwu, Xavier L. Tamu'u, Unstain N. W. J. Rembet   +5 more
doaj   +1 more source

West Florida Shelf pipeline serves as sea turtle benthic habitat based on in situ towed camera observations

Aquatic Biology, 2019
The use of marine offshore benthic habitats by sea turtles is poorly characterized due to the difficulty of obtaining in situ data. Understanding benthic habitat use that is important to the species’ reproduction, foraging, and migrations is critical for
Broadbent, HA, Grasty, SE, Hardy, RF, Lamont, MM, Hart, KM, Lembke, C, Brizzolara, JL, Murawski, S   +7 more
doaj   +1 more source

Harmonizing Multi-Source Sonar Backscatter Datasets for Seabed Mapping Using Bulk Shift Approaches

Remote Sensing, 2020
The development of multibeam echosounders (MBES) as a seabed mapping tool has resulted in the widespread uptake of backscatter intensity as an indicator of seabed substrate properties.
Benjamin Misiuk, Craig J. Brown, Katleen Robert, Myriam Lacharité   +3 more
doaj   +1 more source

Effects of Sediment‐Control Operations on Fish and Macroinvertebrate Communities in Dam Reservoirs

River Research and Applications, EarlyView.
ABSTRACT Sediments are avoided in many river and dam managements because of their adverse effects on water usage and flood control. Recently, sedimentation control measures, including sluicing, have been employed to manage sediments in river channels and restore communities in dammed rivers.
Daisuke Nakano, Jumpei Suzuki, Ryotaro Mori, Yusuke Shinyama, Yuuichi Kitago, Takashi Ihara, Tsuyoshi Saito   +6 more
wiley   +1 more source

Benthic habitat influences sea scallop distributions and swimming behavior based on underwater imagery and machine learning

Ecological Informatics
Understanding the drivers of Atlantic sea scallop distribution and abundance is a priority for fisheries management. While factors influencing scallop habitat selection and recruitment remain poorly understood, the increasing use of optical surveys for ...
Liese A. Siemann, Matthew Dawkins, Luisa M. Garcia, Jonathan Crall, Tasha E. O'Hara   +4 more
doaj   +1 more source

Benthic habitat mapping by autonomous underwater vehicles

, 2013
This work presents a functional system for performing unsupervised classification and mapping of benthic habitats using an autonomous underwater vehicle.
Davie, A (15914786)
core   +1 more source