Relevant bibliographies by topics / Trawl door

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Trawl door'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Trawl door"

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Lucchetti, Alessandro, Emilio Notti, Antonello Sala, and Massimo Virgili. "Multipurpose use of side-scan sonar technology for fisheries science." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 10 (October 2018): 1652–62. http://dx.doi.org/10.1139/cjfas-2017-0359.

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This study illustrates some potential applications of side-scan sonar to explain issues related to fisheries science. Side-scan sonar enabled identification of the footprint of different trawl types. It showed that a twin trawl sweeps a 30% greater area than a traditional trawl and that a semipelagic trawl door has more limited impact than a traditional bottom otter trawl. The side-scan sonar enabled detection and characterization of the interaction of trawl gear with the seafloor. It demonstrated the cod end is floating above the sea bottom during the tow, while the doors and clumps, sweeps and bridles have the most damaging effect on the seafloor. Side-scan sonar was used to assess the interaction between active and passive gear and between trawls and pipelines. It has been able to detect illegal fishing activity in marine protected areas and has been a valuable tool to resolve disputes between different sectors. Side-scan sonar was finally tested as a suitable tool for fish school detection and counting. Side-scan sonar emerged as a flexible tool to tackle rapidly a number of issues related to fishing impact, technology, and biology.
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HU, FUXIANG. "1. Development of the Hyper Lift Trawl Door." NIPPON SUISAN GAKKAISHI 79, no. 6 (2013): 1045. http://dx.doi.org/10.2331/suisan.79.1045.

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Gabruk, Victor I., Ivan A. Kornienko, Vasily V. Kudakaev, Svetlana V. Zhigulskaya, and Kseniya G. Frankovskaya. "Computer modeling of rectangular-cylindrical trawl doors." Izvestiya TINRO 181, no. 2 (June 30, 2015): 231–40. http://dx.doi.org/10.26428/1606-9919-2015-181-231-240.

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Computer modeling of the rectangular-cylindrical trawl doors designed by P.P. Augulis (project 2490) is realized for calculation of their parameters to ensure stable functioning in the process of trawling. Correct choice of the warp point ensures stable functioning of the door for three ways of fastening: directly to the stringer or by means of horizontal strap or bail.
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Brylinsky, Michael, Jamie Gibson, and Donald C. Gordon Jr. "Impacts of Flounder Trawls on the Intertidal Habitat and Community of the Minas Basin, Bay of Fundy." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 3 (March 1, 1994): 650–61. http://dx.doi.org/10.1139/f94-066.

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Four experimental trawls were made at highwater over the intertidal zone of the Minas Basin and the effects assessed when the tide was out to determine the physical and biological impacts of groundfish trawling on the benthos. The trawl doors made furrows 30–85 cm wide and up to 5 cm deep. The rollers compressed surficial sediments but did not scour a depression. The bridle caused no obvious disturbance. Door furrows and roller marks remained visible for 2–7 mo. No significant impacts were observed on either benthic diatoms or macrobenthos. The macrobenthos was dominated by polychaetes, some of which may have the ability to take evasive action as a trawl approaches. There were few molluscs, crustaceans, or echinoderms present; these taxa have been shown to be more susceptible to trawling damage in studies done elsewhere. Nematode numbers were initially depressed in the door furrows but did recover with time. It is not known whether nematodes were killed or displaced but the latter is thought more likely. Overall, the impacts in this particular environment are judged to be minor, especially since the intertidal sediments of the Minas Basin are already exposed to similar natural stresses imposed by storms and winter ice.
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Priatna, Asep, and Suprapto Suprapto. "FACTORS INFLUENCING THE PERFORMANCE OF TRAWL OPERATION IN THE WATERS AREA OF TARAKAN." Indonesian Fisheries Research Journal 23, no. 2 (February 12, 2018): 79. http://dx.doi.org/10.15578/ifrj.23.2.2017.79-87.

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Any fish on swept area of bottom trawl could not be caught due to some technical factors during towing. However, it could be estimated by integrated of bottom trawl and acoustic survey. This paper describes the determination of some factors that affect the performance of trawl net during the bottom trawl survey in the waters of Tarakan. Surveys were carried out in May, August, and November 2012. A total of 57 stations of simultaneously acoustic-trawl were completed. Data collected from each station include catch composition, and variables of trawling operation (i.e. bottom depth, warp length, trawl door opening, towing speed, towing duration, and acoustic fish density). Principal component analysis was applied to identify variables might impact of trawling performance (i.e. fish density at the waters area, towing speed, towing duration, warp length, horizontal opening of trawl door, density of non-demersal at cod end, and bottom depth). Both towing speed and towing duration were not major component for trawl operation. According to test of significance for four variables (i.e. bottom depth, warp length, horizontal opening, biota non-demersal at cod end) which affected to fish density at waters area, that both of variable (i.e. warp length and bottom depth) were significant as the principal components for the performance of bottom trawl.
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KUMAZAWA, TAISEI. "2. Performances of small-scale bottom trawl with Hyper Lift Trawl Door." NIPPON SUISAN GAKKAISHI 79, no. 6 (2013): 1046. http://dx.doi.org/10.2331/suisan.79.1046.

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Gilkinson, Kent, Mike Paulin, Shawn Hurley, and Peter Schwinghamer. "Impacts of trawl door scouring on infaunal bivalves: results of a physical trawl door model/dense sand interaction." Journal of Experimental Marine Biology and Ecology 224, no. 2 (June 1998): 291–312. http://dx.doi.org/10.1016/s0022-0981(97)00207-4.

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Reite, K. J., and A. J. Sorensen. "Mathematical Modeling of the Hydrodynamic Forces on a Trawl Door." IEEE Journal of Oceanic Engineering 31, no. 2 (April 2006): 432–53. http://dx.doi.org/10.1109/joe.2006.875098.

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Smith, C. J., A. C. Banks, and K.-N. Papadopoulou. "Improving the quantitative estimation of trawling impacts from sidescan-sonar and underwater-video imagery." ICES Journal of Marine Science 64, no. 9 (December 1, 2007): 1692–701. http://dx.doi.org/10.1093/icesjms/fsm165.

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Abstract Smith, C. J., Banks, A. C., and Papadopoulou, K.-N. 2007. Improving the quantitative estimation of trawling impacts from sidescan-sonar and underwater-video imagery. – ICES Journal of Marine Science, 64: 1692–1701. The techniques of sidescan sonar and towed, underwater-video sled were assessed as rapid-assessment methodologies for investigating trawl impacts on the substratum. Sidescan sonar is able to image a swathe of ∼200 m with a resolution of ∼20 cm at a speed of 2–3 knots, and marks of trawl doors could be observed. The towed video system imaged a swathe of 1–2 m with a resolution of 1–2 cm at a speed of ∼1 knot, and trawl-door marks, scrape marks, local bioturbation features, and fauna could be observed. Multiple tows using both methodologies were carried out in two areas in Heraklion Bay, Crete. One area, experimentally trawled, was 80–90 m deep and characterized by mixed, maerly sediments; the other was a commercial trawl lane ∼200 m deep characterized by silty-clay sediment. Descriptions of the types of trawling feature and impacts caused by trawling were made for both areas. Images were analysed from the commercial deeper trawling ground for area assessment. For sidescan-sonar records, direction of trawling and trawl-mark density by category were estimated at periodic intervals along the track. For video, categories for trawl-mark density and level of bioturbation were estimated, along with the density of the crinoid Leptometra phalangium. Using geo-referenced positioning for each data point, area maps were constructed for each of the parameters, and correlations were tested between the different datasets. The use of the assessment techniques (characteristics, data usage, mapping, complementarity) in relation to trawling-impact studies is discussed, as well as possibilities for the use of the resulting data for management.
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Jonsson, Ingi M., Leifur Leifsson, Slawomir Koziel, Yonatan A. Tesfahunegn, and Adrian Bekasiewicz. "Trawl-door Shape Optimization by Space-mapping-corrected CFD Models and Kriging Surrogates." Procedia Computer Science 80 (2016): 1061–70. http://dx.doi.org/10.1016/j.procs.2016.05.409.

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Dissertations / Theses on the topic "Trawl door"

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Juliusson, Magnus. "HYDRODYNAMIC OPTIMIZATION OF TWO-DIMENSIONAL MULTI-ELEMENT TRAWL-DOOR SHAPES USING LOCAL SURROGATE MODELS AND ANALYSIS OF CONTROLLABLE TRAWL-DOOR SHAPES." Thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137366.

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The study is motivated by the quest to lower the fuel consumption of trawlers and reduce green house gas emissions. Conventional trawl-doors contribute to about one third of the trawlers fuel consumption. Design and optimization of trawl-doors using computational models is vital in minimizing the fuel consumption.The main objective of this work is to develope an optimization algorithm for the shape design of trawl-doors using computational uid dynamic (CFD) models. High-fidelity CFD models are computationally expensive and therefore, conventional optimization methods, which often require large number of evaluations are not feasible. The proposed method is iterative and uses local second order response surface approximation models of the high-fidelity CFD model, constructed in each iteration. The RSA are constructed locally and are regenerated at each iteration in new domain. We use a trust region mechanism to move the center of the search domain and to increase or decrease the size ofthe search domain. This reduces the number of evaluations. We propose novel shaped trawl-door shapes and investigate their performance. These shapes are similar to multi-element airfoils on aircraft i.e., airfoil shapes with slats and flaps. We apply the proposed optimization algorithm to the novel-shaped design of two-dimensional multi-element trawl-door shapes with several design variables controlling the slat and flap positions and alignment. The objective is to increase the hydrodynamic efficiency for a given lift constraint. The results are then compared to the performance of a typical trawl-door shape. The results indicate that a satisfactory design can be obtained at the cost of few iterations of the algorithm. We also investigate controllable trawl-doors where the flap angle can be varied, depending on the operational condition.
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Hermannsson, Elvar. "Hydrodynamic Shape Optimization of Trawl Doors with Three-Dimensional Computational Fluid Dynamics Models and Local Surrogates." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147352.

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Rising fuel prices have been inflating the operating costs of the fishing industry. Trawl doors are used to hold the fishing net open during trawling operations, and they have a great influence on the fuel consumption of vessels. Improvements in the design of trawl doors could therefore contribute significantly to increased fuel efficiency. An efficient optimization algorithm using two- and three-dimensional (2D and 3D) computational fluid dynamics (CFD) models is presented. Accurate CFD models, especially 3D, are computationally expensive. The direct use of traditional optimization algorithms, which often require a large number of evaluations, can therefore be prohibitive. The proposed method is iterative and uses low-order local response surface approximation models as surrogates for the expensive CFD model to reduce the number of iterations. The algorithm is applied to the design of two types of geometries: a typical modern trawl door, and a novel airfoil-shaped trawl door. The results from the 2D design optimization show that the hydrodynamic efficiency of the typical modern trawl door could be increased by 32%, and the novel airfoil-shaped trawl door by 13%. When the 2D optimum designs for the two geometries are compared, the novel airfoil-shaped trawl door results to be 320% more efficient than the optimized design of the typical modern trawl door. The 2D optimum designs were used as the initial designs for the 3D design optimization. The results from the 3D optimization show that the hydrodynamic efficiency could be increased by 6% for both the typical modern and novel airfoil-shaped trawl doors. Results from a 3D CFD analysis show that 3D flow effects are significant, where the values for drag are significantly underestimated in 2D CFD models.
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Chiarodo, Nicole M. "From Behind Closed Doors to the Campaign Trail: Race and Immigration in British Party Politics, 1945-1965." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002660.

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Books on the topic "Trawl door"

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Walker, Clifford. Back door to California: The story of the Mojave River Trail. Edited by Keeling Patricia Jernigan. Barstow, Calif: Mojave River Valley Museum Association, 1986.

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Hoffsterson, Alex Van. Trail of Open Doors. CreateSpace Independent Publishing Platform, 2011.

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Grafton, Emily. Through the Mill Door and Beyond: Trail Guide to Babcock State Park. Headline Books, 1997.

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Brown, Kate Pride. Baikal Goes Global. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190660949.003.0003.

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This chapter traces the relational position of civil society through the history of three key organizations: Baikal Environmental Wave, the Tahoe-Baikal Institute, and the Great Baikal Trail. The development of local environmental civil society around Lake Baikal in the post-Soviet years was conditioned by two important changes. First, the Soviet collapse opened the door to global interaction. Local civil society was inextricably linked to global networks and forces that shaped the course of its development. Second, civil society’s strength and independence shifted along with the status of other power holders in the larger field. In the 1990s, the economy and the state were in crisis and collapse. Civil society was then most free to define itself and take aggressive positions. As the two opposing powers recover in the 2000s, accommodation to economic and political power is preferred.
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Lake Francis History Book Committee., ed. Along the mission trail: Lake Francis, Bonnie Doon, Graysfield, Glennie. Lake Francis, Man: Lake Francis History Book Committee, 1988.

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Quackenbush, Robert. Miss Mallard Mysteries Collection: Texas Trail to Calamity; Dig to Disaster; Stairway to Doom; Express Train to Trouble; Bicycle to Treachery; Gondola to Danger; Surfboard to Peril; Taxi to Intrigue; Cable Car to Catastrophe; Dogsled to Dread. Simon & Schuster Children's Publishing, 2019.

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Book chapters on the topic "Trawl door"

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Sarmiento-Nafaté, S., J. Enríquez-Zárate, J. Villalobos-Toledo, and C. Pineda-García. "Dynamic Analysis of Trawl Doors Applied in Bottom Trawls to Catch Shrimp." In Emerging Challenges for Experimental Mechanics in Energy and Environmental Applications, Proceedings of the 5th International Symposium on Experimental Mechanics and 9th Symposium on Optics in Industry (ISEM-SOI), 2015, 301–9. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28513-9_42.

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Leifsson, Leifur, Slawomir Koziel, and Eirikur Jonsson. "Hydrodynamic Shape Optimization of Fishing Gear Trawl-Doors." In Advances in Intelligent Systems and Computing, 305–18. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03581-9_22.

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"Benthic Habitats and the Effects of Fishing." In Benthic Habitats and the Effects of Fishing, edited by J. Heifetz, D. L. Courtney, J. T. Fujioka, H. G. Greene, P. Malecha, and R. P. Stone. American Fisheries Society, 2005. http://dx.doi.org/10.47886/9781888569605.ch25.

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Multibeam, backscatter, and video data were collected on Portlock Bank near Kodiak, Alaska in the vicinity of groundfish fisheries. The objective was to characterize habitat in heavily fished grounds to understand whether habitats in current fishing grounds are vulnerable to ongoing fishing activities. The multibeam and backscatter data indicated at least a dozen macro- or meso-habitats. The megahabitats are the result of past glaciation and are presently being reworked into moderate (cm-m) relief features. Submarine canyons notch the upper slope and provide steep relief with alternating mud-covered and consolidated sediment exposures. The video data from the submersible Delta, indicated little evidence of trawling on the low relief grounds of the continental shelf where perhaps the level bottom did not induce door gouging and there was a lack of boulders to be turned over or dragged. The most common epifauna were crinoids, small non-burrowing sea anemones, glass sponges, stylasterid corals and brittlestars. Occasional large boulders were located in depressions were the only anomaly in the otherwise flat seafloor. These depressions may have afforded some protection to fishing gear, as the glass sponges and stylasterid corals attached to these boulders were larger than were typically observed. In contrast, there was evidence of boulders turned over or dragged by trawling in the areas of the upper slope. The uneven bottom perhaps induced gouging by the trawl doors. The substrate was mostly small boulders, cobble, and gravel. Presently there does not appear to be much habitat in this area that can be damaged by trawling. No large corals and very few large sponges were seen. Whether this is the result of past trawl activity is unclear.
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Ebata, Keigo, Tomonori Hiraishi, Yoshihiro Inoue, Taisei Kumazawa, Akimasa Habano, and Munechika Ishizaki. "Improvement of the ‚ÄúSoft Door‚Äù, a newly developed mouth opening device for trawls considering hydraulic dynamics." In Maritime Transportation and Exploitation of Ocean and Coastal Resources, 1217–21. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833728.ch148.

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Conference papers on the topic "Trawl door"

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Leifsson, Leifur T., Slawomir Koziel, Elvar Hermannsson, and Reza Fakhraie. "Trawl-Door Design Optimization by Local Surrogate Models." In 55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0574.

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"Trawl-door Performance Analysis and Design Optimization with CFD." In Special Session on Computationally Efficient Simulation-Driven Engineering Design Optimization and Modeling. SciTePress - Science and and Technology Publications, 2012. http://dx.doi.org/10.5220/0004163904790488.

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Hermannsson, Elvar, Leifur Leifsson, Slawomir Koziel, Piotr Kurgan, and Adrian Bekasiewicz. "Trawl-door Shape Optimization with 3D CFD Models and Local Surrogates." In Special Session on Computationally Efficient Simulation-Driven Engineering Design Optimization and Modeling. SCITEPRESS - Science and and Technology Publications, 2014. http://dx.doi.org/10.5220/0005131307750784.

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Wu, Jie, Chittiappa Muthanna, Hagbart Alsos, Rasmus Juhlin, and Daniel Karunakaran. "Experimental Investigation of Over-Trawlability of an Innovative Arctic Subsea Production Unit (SPU)." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95503.

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Abstract Model tests have been performed to examine the overtrawlability of Subsea7’s Subsea Production Unit (SPU) in SINTEF Ocean’s Ocean Laboratory in November/December 2017. In this test campaign, 50 tests with different SPU orientations and trawling equipment were carried out. Two trawling water depth (100 m and 500 m) were simulated in the model test. Two types of trawl door, i.e. Thyborøn (5.5t) and Poly Ice (3.8t), with Selstad No. 620 type fishing net were used in present test. Overtrawling with a roller clump (7.6t) was also tested. Two trawling speeds of 1.6 m/s and 2.6 m/s and 5 SPU orientations were examined. Force measurements both on the fishing lines, and directly measured on the SPU were used to determine overtrawlability of the SPU. The dynamometer used in present test to measure the forces directly on the SPU is the first time that this type of measurement has been undertaken at SINTEF Ocean at the Ocean Basin facility with fully modelled trawling gear.
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Cheng, Hui, Karl Gunnar Aarsæther, Lin Li, and Muk Chen Ong. "Numerical Study of a Single-Point Mooring Gravity Fish Cage With Different Deformation-Suppression Methods." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96079.

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Abstract Compared to the multi-point mooring fish cage, the single point mooring (SPM) fish cage can spread out the accumulation of organic matter to prevent the local environment from being overwhelmed, and reduce the manufacturing cost at the same time. Thus, it has attracted many attentions recently. In this research, different deformation-suppression methods are applied to the SPM system with a typical Norwegian fish cage aiming to reduce the cultivation volume loss. A well-validated software, FhSim, is used to conduct the full-scale numerical study. The effects of the three deformation-suppression methods (i.e. (i) adding the lower bridles, (ii) adding the frontal rigid frame, (iii) adding the trawl door) are analyzed under pure current and combined wave-current conditions. The results indicate that all the three methods can reduce the cultivation volume loss at least by 32% compared to the one with the original SPM system when the current velocity is larger than 0.5 m/s. In addition, moving the conjunction point close to the bottom ring can bring positive effect in the cultivation volume maintaining with an unnoticeable increase in the tension force. This study will provide practical advice and useful guides for the SPM fish cage design.
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Haugen, Joakim, Eduardo Grimaldo, and Svein H. Gjøsund. "A Winch Reference Control System for Semi-Pelagic Triple Trawling: With Full-Scale Sea Trials." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61167.

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Multi-rig bottom trawling can negatively impact the seabed, and the bottom contact forces contribute to the total towing resistance. Lifting the doors from the seabed can reduce some of the trawl gear’s influence on the seabed and save fuel costs. In this study we evaluated a simple reference controller designed to control a trawl door’s distance from the seabed. This was achieved by providing desired warp lengths to a controller, which then regulated the distance via a low-pressure hydraulic winch. The reference controller algorithm uses an anti-windup proportional-integral controller with saturation of winch acceleration and speed. Herein, we present results of a full-scale sea trial conducted using a triple shrimp trawl with trawl doors towed close to the seabed. Our results demonstrate the feasibility of controlling the trawl doors’ altitude above the seabed using only winch-actuated feedback.
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Jonsson, Eirikur, Slawomir Koziel, and Leifur Leifsson. "Computational Fluid Dynamic Analysis and Shape Optimization of Trawl-Doors." In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-232.

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