Influence of strain-rate on the interaction between towed fishing gears and the seabed

Shamendra Malinga Aluwihare; Ana Ivanovic; Finbarr O'Neill

doi:10.1016/j.oceaneng.2023.114001

Influence of strain-rate on the interaction between towed fishing gears and the seabed

Shamendra Malinga Aluwihare, Ana Ivanovic^* (Corresponding Author), Finbarr O'Neill

^*Corresponding author for this work

Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The ability to predict the seabed penetration and the drag force of the gear components of demersal trawlers is of significant benefit to the fisheries industry. It allows for the design of gears of reduced environmental impact and of improved fuel efficiency. This study presents a single-phase strain rate dependent soil model that can accurately predict deformation of a saturated granular soil. Elements of an otter trawl system are modelled as simplified discs
which are then translated across a seabed at given speed where horizontal drag force and vertical penetration is measured. This is facilitated using an explicit Finite Element (FE) model developed in ABAQUS alongside a Coupled Eulerian-Lagrangian (CEL) mesh. Comparisons against laboratory experiments showed that the model was correctly able to capture the increase in drag force with towing speed. Further comparisons against full scale sea trials indicated the model generally compared well against test data and correctly identified the trends and magnitudes of drag force against towing speed. From these results, the influence of strain rate in the soil was studied in detail and conclusions drawn on the resultant drag force and penetration of towed fishing gears on the seabed.

Original language	English
Article number	114001
Number of pages	9
Journal	Ocean Engineering
Volume	274
Early online date	3 Mar 2023
DOIs	https://doi.org/10.1016/j.oceaneng.2023.114001
Publication status	Published - 15 Apr 2023

Bibliographical note

Acknowledgements
FGONs contribution was partly funded by : Grant PID2019-107345RB-I00 of the European Maritime and Fisheries Fund (EMFF) and the Ministry of Environment and Food of Denmark in the project ’Quantifying and reducing the physical impact of mobile fishing gears (Refigure)’, (Grant Agreement No 33113-B-20-176).

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Cite this

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title = "Influence of strain-rate on the interaction between towed fishing gears and the seabed",

abstract = "The ability to predict the seabed penetration and the drag force of the gear components of demersal trawlers is of significant benefit to the fisheries industry. It allows for the design of gears of reduced environmental impact and of improved fuel efficiency. This study presents a single-phase strain rate dependent soil model that can accurately predict deformation of a saturated granular soil. Elements of an otter trawl system are modelled as simplified discswhich are then translated across a seabed at given speed where horizontal drag force and vertical penetration is measured. This is facilitated using an explicit Finite Element (FE) model developed in ABAQUS alongside a Coupled Eulerian-Lagrangian (CEL) mesh. Comparisons against laboratory experiments showed that the model was correctly able to capture the increase in drag force with towing speed. Further comparisons against full scale sea trials indicated the model generally compared well against test data and correctly identified the trends and magnitudes of drag force against towing speed. From these results, the influence of strain rate in the soil was studied in detail and conclusions drawn on the resultant drag force and penetration of towed fishing gears on the seabed.",

author = "Aluwihare, {Shamendra Malinga} and Ana Ivanovic and Finbarr O'Neill",

note = "Acknowledgements FGONs contribution was partly funded by : Grant PID2019-107345RB-I00 of the European Maritime and Fisheries Fund (EMFF) and the Ministry of Environment and Food of Denmark in the project {\textquoteright}Quantifying and reducing the physical impact of mobile fishing gears (Refigure){\textquoteright}, (Grant Agreement No 33113-B-20-176). ",

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N2 - The ability to predict the seabed penetration and the drag force of the gear components of demersal trawlers is of significant benefit to the fisheries industry. It allows for the design of gears of reduced environmental impact and of improved fuel efficiency. This study presents a single-phase strain rate dependent soil model that can accurately predict deformation of a saturated granular soil. Elements of an otter trawl system are modelled as simplified discswhich are then translated across a seabed at given speed where horizontal drag force and vertical penetration is measured. This is facilitated using an explicit Finite Element (FE) model developed in ABAQUS alongside a Coupled Eulerian-Lagrangian (CEL) mesh. Comparisons against laboratory experiments showed that the model was correctly able to capture the increase in drag force with towing speed. Further comparisons against full scale sea trials indicated the model generally compared well against test data and correctly identified the trends and magnitudes of drag force against towing speed. From these results, the influence of strain rate in the soil was studied in detail and conclusions drawn on the resultant drag force and penetration of towed fishing gears on the seabed.

AB - The ability to predict the seabed penetration and the drag force of the gear components of demersal trawlers is of significant benefit to the fisheries industry. It allows for the design of gears of reduced environmental impact and of improved fuel efficiency. This study presents a single-phase strain rate dependent soil model that can accurately predict deformation of a saturated granular soil. Elements of an otter trawl system are modelled as simplified discswhich are then translated across a seabed at given speed where horizontal drag force and vertical penetration is measured. This is facilitated using an explicit Finite Element (FE) model developed in ABAQUS alongside a Coupled Eulerian-Lagrangian (CEL) mesh. Comparisons against laboratory experiments showed that the model was correctly able to capture the increase in drag force with towing speed. Further comparisons against full scale sea trials indicated the model generally compared well against test data and correctly identified the trends and magnitudes of drag force against towing speed. From these results, the influence of strain rate in the soil was studied in detail and conclusions drawn on the resultant drag force and penetration of towed fishing gears on the seabed.

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Influence of strain-rate on the interaction between towed fishing gears and the seabed

Abstract

Bibliographical note

UN SDGs

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