Drifters, Drogues, and Circulation

Manley, T. O.

doi:10.5670/oceanog.2010.17

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Steel weights (1 -3 kg) attached to the bottom of the drogue via zip ties were used to overcome drogue buoyancy and decrease the possibility of wind and wave rectification and lateral translation, and also enabled the cylindrical floats to remain upright. The design of drifter is a modification of that of Manley (2010), but differs in significant aspects (horizontal drogue plane, HDPE drogue material, use of Globalstar satellite system and SPOT Trace GPS units, and solar powered top beacon).…”

Section: Drogue Designmentioning

confidence: 99%

“…Currents have historically been investigated in marine settings using a variety of robust and capable sampling equipment, though often expensive and difficult to deploy (Edwards et al, 2006, and references therein). Currents in the Laurentian Great Lakes of North America and similar large lakes (Choi et al, 2020;Edwards et al 2006), in the coastal zone (Sabet and Barani, 2011), and in estuaries (Spencer et al, 2014;Suara et al, 2018;Déjeans et al, 2021) have also been investigated, yet smaller and medium-sized lakes (~50-500 km 2 ) have received less attention than perhaps they should have, despite improvements in technology including the availability of small GPS units as tracking devices (McCormick et al, 2006;Manley, 2010). New technology and low-cost, high-performance materials are therefore unlocking opportunities to measure currents in a wider range of water body sizes, including smaller inland lakes.…”

Section: Introductionmentioning

confidence: 99%

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An Economical Open-Source Lagrangian Drifter Design to Measure Deep Currents in Lakes

McCaffrey,

Koeberle

2024

Preprint

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The objective was to construct and test an economical, accurate, and open-source Lagrangian drifter design suitable for lakes <200 km2. Lagrangian drifters are used to trace water currents in marine and freshwater settings and comprise of a low-friction surface float containing instrumentation for location and environmental measurement, tethered to a high-friction drogue at the depth of interest. Oceanic drifters are robust but expensive, and this design tailored to inland lake waterbodies fills a durability and cost gap for lake environments. Water-following characteristics were tested using theoretical drag coefficient calculations, practical drag measurements, and comparison of wind and drifter vectors while deployed on two deep inland lakes (maximum area 175 km2) in the Finger Lakes region of New York, USA. The ratio of drag between float and drogue met or exceeded the minimum value of 40 recommended in the literature, and the vectors of wind and drifter during deployment were independent of one another, meaning the device accurately traced the movement of water currents at depth without undue influence of wind and waves. Each device cost USD $265 in 2021 and was built from materials readily available at hardware and sporting goods stores, allowing their use by research institutions and communities with smaller budgets. This design reliably measured lake currents at sampling depths that ranged from to 30 m. We anticipate that this design will have application to a wide range of hydrodynamic and ecological research where empirical insights to physical processes like lake currents are sought by scientists and managers.

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Section: Drogue Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Economical Open-Source Lagrangian Drifter Design to Measure Deep Currents in Lakes

McCaffrey,

Koeberle

2024

Preprint

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“…These environments are commonly subject to processes such as planktonic larval distribution, discharged contaminants, and potentially harmful suspended sediment plumes. Analysing surface water dispersion provides very useful information; as it drives not only the flow field but also a lot of biological, chemical, and sedimentological constituents (Manley, 2010).…”

Section: Introductionmentioning

confidence: 99%

Quantifying dispersion in an estuary: A Lagrangian drifter approach

Spencer

Lemckert

et al. 2014

Journal of Coastal Research

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A study of ocean parameters in Bay of Bengal (BoB) using indigenised drifting buoys

et al. 2019

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Drifting buoys (DBs) are widely deployed to observe near-surface ocean currents and sea surface temperature. The National Institute of Ocean Technology (NIOT), Chennai, India, had indigenised the DB with the Indian satellite (INSAT) in 2012. This paper describes the results of various studies conducted by NIOT using the indigenised DBs and also describes unique features attempted in indigenised DBs to measure the near-surface ocean current with 24 position acquisitions per day to capture small-scale surface eddies and the use of realtime geostationary satellite communication every hour. Additionally, the surface currents observed with indigenous DB are compared with DBs available in the market, Marlin-Yug (coefficient of determination R 2 [ 0.88) and forecast using the ocean surface current analyses real-time (coefficient of determination R 2 [0.90).Our results show that the DBs in the Bay of Bengal are carried with the East India Coastal Current in the March-May periods and the in-situ observations by the DB provide accurate surface current observations than satellite-based data. Furthermore, the new observations near the world's largest tidal mangrove and delta system, the Sundarbans and Bengal Delta, will help in further enhancing our understanding of the spatiotemporal variability in the region in terms of coastal currents and its influence on marine environments.(0123456789().,-v ol.:V)( 01234567 89().,-vol.:V)

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Drifters, Drogues, and Circulation

Cited by 5 publications

References 10 publications

An Economical Open-Source Lagrangian Drifter Design to Measure Deep Currents in Lakes

An Economical Open-Source Lagrangian Drifter Design to Measure Deep Currents in Lakes

Quantifying dispersion in an estuary: A Lagrangian drifter approach

A study of ocean parameters in Bay of Bengal (BoB) using indigenised drifting buoys

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