Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves
The rapid growth of marine aquaculture around the world accentuates issues of sustainability and environmental impacts of large-scale farming systems. One potential mitigation strategy is to relocate to more energetic offshore locations. However, research regarding the forces which waves and current...
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MDPI AG
2020-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/9/1/29 |
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| author | Rebekka Gieschen Christian Schwartpaul Jannis Landmann Lukas Fröhling Arndt Hildebrandt Nils Goseberg |
| author_facet | Rebekka Gieschen Christian Schwartpaul Jannis Landmann Lukas Fröhling Arndt Hildebrandt Nils Goseberg |
| author_sort | Rebekka Gieschen |
| collection | DOAJ |
| description | The rapid growth of marine aquaculture around the world accentuates issues of sustainability and environmental impacts of large-scale farming systems. One potential mitigation strategy is to relocate to more energetic offshore locations. However, research regarding the forces which waves and currents impose on aquaculture structures in such conditions is still scarce. The present study aimed at extending the knowledge related to live blue mussels (<i>Mytilus edulis</i>), cultivated on dropper lines, by unique, large-scale laboratory experiments in the Large Wave Flume of the Coastal Research Center in Hannover, Germany. Nine-months-old live dropper lines and a surrogate of 2.0 m length each are exposed to regular waves with wave heights between 0.2 and 1.0 m and periods between 1.5 and 8.0 s. Force time histories are recorded to investigate the inertia and drag characteristics of live mussel and surrogate dropper lines. The surrogate dropper line was developed from 3D scans of blue mussel dropper lines, using the surface descriptor Abbott–Firestone Curve as quality parameter. Pull-off tests of individual mussels are conducted that reveal maximum attachment strength ranges of 0.48 to 10.55 N for mussels that had medium 3.04 cm length, 1.60 cm height and 1.25 cm width. Mean drag coefficients of <i>C<sub>D</sub></i> = 3.9 were found for live blue mussel lines and <i>C<sub>D</sub></i> = 3.4 for the surrogate model, for conditions of Keulegan–Carpenter number (<i>KC</i>) 10 to 380, using regular wave tests. |
| first_indexed | 2024-03-10T13:39:15Z |
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| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T13:39:15Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-f13982ae69e84ffab003cd25cc62563a2023-11-21T03:11:49ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-12-01912910.3390/jmse9010029Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface WavesRebekka Gieschen0Christian Schwartpaul1Jannis Landmann2Lukas Fröhling3Arndt Hildebrandt4Nils Goseberg5Leichtweiß-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, Beethovenstraße 51a, 38106 Braunschweig, GermanyLeichtweiß-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, Beethovenstraße 51a, 38106 Braunschweig, GermanyLudwig-Franzius-Institut for Hydraulic, Estuarine and Coastal Engineering, Leibniz Universität Hannover, Nienburger Str. 4, 30167 Hannover, GermanyLudwig-Franzius-Institut for Hydraulic, Estuarine and Coastal Engineering, Leibniz Universität Hannover, Nienburger Str. 4, 30167 Hannover, GermanyLudwig-Franzius-Institut for Hydraulic, Estuarine and Coastal Engineering, Leibniz Universität Hannover, Nienburger Str. 4, 30167 Hannover, GermanyLeichtweiß-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, Beethovenstraße 51a, 38106 Braunschweig, GermanyThe rapid growth of marine aquaculture around the world accentuates issues of sustainability and environmental impacts of large-scale farming systems. One potential mitigation strategy is to relocate to more energetic offshore locations. However, research regarding the forces which waves and currents impose on aquaculture structures in such conditions is still scarce. The present study aimed at extending the knowledge related to live blue mussels (<i>Mytilus edulis</i>), cultivated on dropper lines, by unique, large-scale laboratory experiments in the Large Wave Flume of the Coastal Research Center in Hannover, Germany. Nine-months-old live dropper lines and a surrogate of 2.0 m length each are exposed to regular waves with wave heights between 0.2 and 1.0 m and periods between 1.5 and 8.0 s. Force time histories are recorded to investigate the inertia and drag characteristics of live mussel and surrogate dropper lines. The surrogate dropper line was developed from 3D scans of blue mussel dropper lines, using the surface descriptor Abbott–Firestone Curve as quality parameter. Pull-off tests of individual mussels are conducted that reveal maximum attachment strength ranges of 0.48 to 10.55 N for mussels that had medium 3.04 cm length, 1.60 cm height and 1.25 cm width. Mean drag coefficients of <i>C<sub>D</sub></i> = 3.9 were found for live blue mussel lines and <i>C<sub>D</sub></i> = 3.4 for the surrogate model, for conditions of Keulegan–Carpenter number (<i>KC</i>) 10 to 380, using regular wave tests.https://www.mdpi.com/2077-1312/9/1/29aquaculturebivalveswavesphysical model testsLarge Wave Flume |
| spellingShingle | Rebekka Gieschen Christian Schwartpaul Jannis Landmann Lukas Fröhling Arndt Hildebrandt Nils Goseberg Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves Journal of Marine Science and Engineering aquaculture bivalves waves physical model tests Large Wave Flume |
| title | Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves |
| title_full | Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves |
| title_fullStr | Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves |
| title_full_unstemmed | Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves |
| title_short | Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves |
| title_sort | large scale laboratory experiments on mussel dropper lines in ocean surface waves |
| topic | aquaculture bivalves waves physical model tests Large Wave Flume |
| url | https://www.mdpi.com/2077-1312/9/1/29 |
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