Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

DOI

  • Author: Depestele, Jochen

    Institute for Agricultural and Fisheries Research, Belgium

  • Author: Degrendele, Koen

    FPS Economy, SMEs, Middle Classes, and Energy, Belgium

  • Author: Esmaeili, Moosa

    University of Aberdeen, United Kingdom

  • Author: Ivanović, Ana

    University of Aberdeen, United Kingdom

  • Author: Kröger, Silke

    CEFAS Lowestoft Laboratory, United Kingdom

  • Author: O’Neill, Finbarr G.

    Section for Ecosystem based Marine Management, National Institute of Aquatic Resources, Technical University of Denmark, Willemoesvej 2, 9850, Hirtshals, Denmark

  • Author: Parker, Ruth

    CEFAS Lowestoft Laboratory, United Kingdom

  • Author: Polet, Hans

    Institute for Agricultural and Fisheries Research, Belgium

  • Author: Roche, Marc

    FPS Economy, SMEs, Middle Classes, and Energy, Belgium

  • Author: Teal, Lorna R.

    Wageningen IMARES, Netherlands

  • Author: Vanelslander, Bart

    Institute for Agricultural and Fisheries Research, Belgium

  • Author: Rijnsdorp, Adriaan D.

    Wageningen IMARES, Netherlands

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Tickler-chain SumWing and electrode-fitted PulseWing trawls were compared to assess seabed impacts. Multi-beam echo sounder (MBES) bathymetry confirmed that the SumWing trawl tracks were consistently and uniformly deepened to 1.5 cm depth in contrast to 0.7 cm following PulseWing trawling. MBES backscatter strength analysis showed that SumWing trawls (3.11 dB) flattened seabed roughness significantly more than PulseWing trawls (2.37 dB). Sediment Profile Imagery (SPI) showed that SumWing trawls (mean, SD) homogenised the sediment deeper (3.4 cm, 0.9 cm) and removed more of the oxidised layer than PulseWing trawls (1 cm, 0.8 cm). The reduced PulseWing trawling impacts allowed a faster re-establishment of the oxidised layer and micro-topography. Particle size analysis suggested that SumWing trawls injected finer particles into the deeper sediment layers (∼4 cm depth), while PulseWing trawling only caused coarsening of the top layers (winnowing effect). Total penetration depth (mean, SD) of the SumWing trawls (4.1 cm, 0.9 cm) and PulseWing trawls (1.8 cm, 0.8 cm) was estimated by the depth of the disturbance layer and the layer of mobilized sediment (SumWing = 0.7 cm; PulseWing trawl = 0.8 cm). PulseWing trawls reduced most of the mechanical seabed impacts compared to SumWing trawls for this substrate and area characteristics
Original languageEnglish
JournalICES Journal of Marine Science
Volume76
Issue number1
Pages (from-to)312-329
ISSN1054-3139
DOIs
Publication statusPublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Beam trawl, Biogeochemistry, Habitat impacts, Particle size distribution, Penetration depth, Pulse trawl, Seafloor integrity, Sediment resuspension

ID: 153815170