A Portable Retractable ADCP Boom-Mount for Small Boats

Hench, James L.; Luettich, Richard A.; Bircher, James T.

doi:10.2307/1353331

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…To assess current magnitude and direction, we employed an RD Instruments Workhorse 300‐kHz Broadband ADCP with bottom tracking. The ADCP was deployed on a 6‐m small boat using a hull‐mounted aluminum boom similar to that detailed in Hench et al. (2000).…”

Section: Methodsmentioning

confidence: 99%

“…To assess current magnitude and direction, we employed an RD Instruments Workhorse 300-kHz Broadband ADCP with bottom tracking. The ADCP was deployed on a 6-m small boat using a hullmounted aluminum boom similar to that detailed in Hench et al (2000). The ADCP transducer head was positioned 1 m below the surface to avoid hull effects, and the cruise speed during transects was approximately 9 km h )1 .…”

Section: Acoustic Doppler Current Profiler Observationsmentioning

confidence: 99%

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Flow‐field observations of a tidally driven island wake used by marine mammals in the Bay of Fundy, Canada

Johnston¹,

Read

2007

Fisheries Oceanography

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Correlations between fine-scale oceanographic features and aggregations of marine mammals are frequently reported, but the physical forces shaping these relationships are rarely explored. We conducted a series of oceanographic observations and remote sensing surveys of an oceanographic feature near Grand Manan Island known to attract marine mammals on flood tides. We tracked drift drogues from cliff-top with a theodolite and conducted boxtype surveys with an acoustic Doppler current profiler (ADCP) to assess flow patterns within the oceanographic feature. The feature was also visualized with Synthetic Aperture Radar (SAR) scenes. Drift drogues were advected towards a shear line originating near the northern tip of the island and entrained in one or more eddies downstream. ADCP surveys confirmed the presence of the shear line between rapid easterly flow and slower return flow. As the tide progressed, the shear line extended and manifested a single anti-cyclonic eddy at its distal end. As the flood tide progressed, northerly flow along the eastern shore of the island intensified and deflected the shear line northwards, shedding the eddy at slack high water. SAR images confirmed the presence of the shearline and eddy system, illustrating the evolution of a wake behind the island on flood tides. Profiles of flow direction and acoustic backscatter revealed secondary flows within the wake consistent with models and observations of other wakes. Oceanographic and remote sensing observations confirm that an island wake is generated by tidal flow past Grand Manan Island and provide an ecological context for the predictable aggregations of odontocete and mysticete cetaceans observed foraging within this region.

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Section: Methodsmentioning

confidence: 99%

Section: Acoustic Doppler Current Profiler Observationsmentioning

confidence: 99%

Flow‐field observations of a tidally driven island wake used by marine mammals in the Bay of Fundy, Canada

Johnston¹,

Read

2007

Fisheries Oceanography

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“…Initially, most Acoustic Doppler Current Profiler (ADCP) data were collected by deep displacement oceanographic vessels. Various methods have emerged [1] to allow shallow-water ADCP data collection, including data from the top of the water column. [1] presents a retractable ADCP boom-mount for use on small fiberglass boats, and shows estuary survey data collected from a small boat that would have been difficult or impossible to obtain using a deep displacement hull vessel or with a towed vehicle.…”

Section: A Crewed Oceanographic Vesselsmentioning

confidence: 99%

The WHOI Jetyak: An autonomous surface vehicle for oceanographic research in shallow or dangerous waters

Kimball

Bailey

Das

et al. 2014

2014 IEEE/OES Autonomous Underwater Vehicles (AUV)

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This paper illustrates the components, capabilities, and some characteristic applications of the Woods Hole Oceanographic Institution Jetyak -a small autonomous surface vehicle (ASV) designed for the collection of oceanographic data from shallow or dangerous waters. The Jetyak is the result of custom modifications to a Mokai jet-powered kayak, including an A-frame and sea chest for installation of instrumentation, servo-driven controls and an Ardupilot autopilot for autonomous operation, an onboard computer for instrument control and data logging, and radios for wireless operation and communications. With these modifications, the Jetyak's cost of replacement is less than $15,000 (excluding the cost of instrumentation payload).The paper addresses the strengths and weaknesses of the Jetyak relative to piloted small boats and jetskis, autonomous underwater vehicles, and existing ASVs.Preliminary data are included from some shallow-water and dangerous Jetyak field campaigns in order to illustrate applications to which the Jetyak is well or uniquely suited.

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Movement patterns and trajectories of ovigerous blue crabs Callinectes sapidus during the spawning migration

Carr

Tankersley

Hench

et al. 2004

Estuarine, Coastal and Shelf Science

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A Portable Retractable ADCP Boom-Mount for Small Boats

Cited by 4 publications

References 14 publications

Flow‐field observations of a tidally driven island wake used by marine mammals in the Bay of Fundy, Canada

Flow‐field observations of a tidally driven island wake used by marine mammals in the Bay of Fundy, Canada

The WHOI Jetyak: An autonomous surface vehicle for oceanographic research in shallow or dangerous waters

Movement patterns and trajectories of ovigerous blue crabs Callinectes sapidus during the spawning migration

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