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Wave Attenuation Through Submerged Oyster Aquaculture Cages.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Wave Attenuation Through Submerged Oyster Aquaculture Cages./
Author:	Hanley, Liam.
Description:	1 online resource (79 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-06.
Contained By:	Masters Abstracts International85-06.
Subject:	Biological oceanography. -
Online resource:	click for full text (PQDT)
ISBN:	9798380865272

Wave Attenuation Through Submerged Oyster Aquaculture Cages.
Hanley, Liam.

Wave Attenuation Through Submerged Oyster Aquaculture Cages. - 1 online resource (79 pages)

Source: Masters Abstracts International, Volume: 85-06.

Thesis (M.S.)--The University of Maine, 2023.

Includes bibliographical references

Coastal erosion presents a growing issue to shorelines around the world and is especially harmful to Maine, a region where sea-level rise is higher than the global average. Green and hybrid coastal defense strategies are being implemented around the country to provide sustainable, habitat-friendly solutions to erosion control. Maine is a hotspot for commercial aquaculture, with an estimated $13.6 million economic impact. This study looks to bridge the gap between Maine aquaculture and the living shorelines initiative, by determining the wave attenuating properties of submerged oyster cages. The project will be able to inform local oyster farmers, resource planners, and engineers on the potential for submerged oyster farms to attenuate wave energy. This study aims to explore the idea of a working waterfront, where coastal resilience and sustainability are tied in with economic opportunity, all while encouraging the protection of habitats and water resources. This study utilizes field observations from several SOFAR Spotter Buoys deployed for 28 days that were positioned before and after a long line of bottom lying oyster cages to measure wave decay in a protected inlet of Casco Bay in the Gulf of Maine. These observations were combined with water level data from a HOBO water level logger to assess the effect of tidal fluctuations. A computational fluid dynamic model complemented the field observations, which allowed for the characterization of the longitudinal wave decay along the farm. The wave attenuation mechanism was determined, as well as the wave-induced setup in mean water levels. The CFD model is a cut section of a long line of bottom-lying oysters, using DualSPHysics, a smooth particle hydrodynamic model. Wave decay of up to 80% for ~4 second waves was seen over 30 m of oyster cages, where less-steep waves and shorter waves were attenuated more. Added mass drag dominated wave attenuation compared to friction, supported by KC (Keulegan Carpenter Number) values <5. Given that waves generally attenuated by 30% over a narrow distance, this likely affected mean water levels through gradients in radiation stresses. Using a simple, cross-shore, wave- and depth-averaged momentum balance, set up in mean water levels reached up to 5 cm when including tidal currents. Barotropic gradients are known to drive currents, indicating that scaled-up versions of bottom oyster farms could have implications on coastal circulation in semi enclosed systems. Future research should explore optimization of bottom oyster farms to reduce a broader range of wave environments, while assessing the secondary effects of wave attenuation on ambient hydrodynamics.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380865272Subjects--Topical Terms:

1178855
Biological oceanography.
Subjects--Index Terms:

Coastal erosion Index Terms--Genre/Form:

554714
Electronic books.

Wave Attenuation Through Submerged Oyster Aquaculture Cages.
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245 1 0 $a Wave Attenuation Through Submerged Oyster Aquaculture Cages.
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500 $a Source: Masters Abstracts International, Volume: 85-06.
500 $a Advisor: Huguenard, Kimberly.
502 $a Thesis (M.S.)--The University of Maine, 2023.
504 $a Includes bibliographical references
520 $a Coastal erosion presents a growing issue to shorelines around the world and is especially harmful to Maine, a region where sea-level rise is higher than the global average. Green and hybrid coastal defense strategies are being implemented around the country to provide sustainable, habitat-friendly solutions to erosion control. Maine is a hotspot for commercial aquaculture, with an estimated $13.6 million economic impact. This study looks to bridge the gap between Maine aquaculture and the living shorelines initiative, by determining the wave attenuating properties of submerged oyster cages. The project will be able to inform local oyster farmers, resource planners, and engineers on the potential for submerged oyster farms to attenuate wave energy. This study aims to explore the idea of a working waterfront, where coastal resilience and sustainability are tied in with economic opportunity, all while encouraging the protection of habitats and water resources. This study utilizes field observations from several SOFAR Spotter Buoys deployed for 28 days that were positioned before and after a long line of bottom lying oyster cages to measure wave decay in a protected inlet of Casco Bay in the Gulf of Maine. These observations were combined with water level data from a HOBO water level logger to assess the effect of tidal fluctuations. A computational fluid dynamic model complemented the field observations, which allowed for the characterization of the longitudinal wave decay along the farm. The wave attenuation mechanism was determined, as well as the wave-induced setup in mean water levels. The CFD model is a cut section of a long line of bottom-lying oysters, using DualSPHysics, a smooth particle hydrodynamic model. Wave decay of up to 80% for ~4 second waves was seen over 30 m of oyster cages, where less-steep waves and shorter waves were attenuated more. Added mass drag dominated wave attenuation compared to friction, supported by KC (Keulegan Carpenter Number) values <5. Given that waves generally attenuated by 30% over a narrow distance, this likely affected mean water levels through gradients in radiation stresses. Using a simple, cross-shore, wave- and depth-averaged momentum balance, set up in mean water levels reached up to 5 cm when including tidal currents. Barotropic gradients are known to drive currents, indicating that scaled-up versions of bottom oyster farms could have implications on coastal circulation in semi enclosed systems. Future research should explore optimization of bottom oyster farms to reduce a broader range of wave environments, while assessing the secondary effects of wave attenuation on ambient hydrodynamics.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Biological oceanography. $3 1178855
650 4 $a Physical oceanography. $3 1178843
650 4 $a Fluid mechanics. $3 555551
653 $a Coastal erosion
653 $a Coastal defense
653 $a Wave energy
653 $a Hydrodynamic model
653 $a Keulegan Carpenter Number
655 7 $a Electronic books. $2 local $3 554714
690 $a 0415
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710 2 $a The University of Maine. $3 845490
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Masters Abstracts International $g 85-06.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30973287 $z click for full text (PQDT)