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

Jochen Depestele*, Koen Degrendele, Moosa Esmaeili, Ana Ivanović, Silke Kröger, Finbarr G. O’Neill, Ruth Parker, Hans Polet, Marc Roche, Lorna R. Teal, Bart Vanelslander, Adriaan D. Rijnsdorp

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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

Keywords

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

Cite this

Depestele, Jochen ; Degrendele, Koen ; Esmaeili, Moosa ; Ivanović, Ana ; Kröger, Silke ; O’Neill, Finbarr G. ; Parker, Ruth ; Polet, Hans ; Roche, Marc ; Teal, Lorna R. ; Vanelslander, Bart ; Rijnsdorp, Adriaan D. / Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl. In: ICES Journal of Marine Science. 2019 ; Vol. 76, No. 1. pp. 312-329.
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title = "Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl",
abstract = "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",
keywords = "Beam trawl, Biogeochemistry, Habitat impacts, Particle size distribution, Penetration depth, Pulse trawl, Seafloor integrity, Sediment resuspension",
author = "Jochen Depestele and Koen Degrendele and Moosa Esmaeili and Ana Ivanović and Silke Kr{\"o}ger and O’Neill, {Finbarr G.} and Ruth Parker and Hans Polet and Marc Roche and Teal, {Lorna R.} and Bart Vanelslander and Rijnsdorp, {Adriaan D.}",
year = "2019",
doi = "10.1093/icesjms/fsy124",
language = "English",
volume = "76",
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Depestele, J, Degrendele, K, Esmaeili, M, Ivanović, A, Kröger, S, O’Neill, FG, Parker, R, Polet, H, Roche, M, Teal, LR, Vanelslander, B & Rijnsdorp, AD 2019, 'Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl', ICES Journal of Marine Science, vol. 76, no. 1, pp. 312-329. https://doi.org/10.1093/icesjms/fsy124

Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl. / Depestele, Jochen; Degrendele, Koen; Esmaeili, Moosa; Ivanović, Ana; Kröger, Silke; O’Neill, Finbarr G.; Parker, Ruth; Polet, Hans; Roche, Marc; Teal, Lorna R.; Vanelslander, Bart; Rijnsdorp, Adriaan D.

In: ICES Journal of Marine Science, Vol. 76, No. 1, 2019, p. 312-329.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl

AU - Depestele, Jochen

AU - Degrendele, Koen

AU - Esmaeili, Moosa

AU - Ivanović, Ana

AU - Kröger, Silke

AU - O’Neill, Finbarr G.

AU - Parker, Ruth

AU - Polet, Hans

AU - Roche, Marc

AU - Teal, Lorna R.

AU - Vanelslander, Bart

AU - Rijnsdorp, Adriaan D.

PY - 2019

Y1 - 2019

N2 - 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

AB - 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

KW - Beam trawl

KW - Biogeochemistry

KW - Habitat impacts

KW - Particle size distribution

KW - Penetration depth

KW - Pulse trawl

KW - Seafloor integrity

KW - Sediment resuspension

U2 - 10.1093/icesjms/fsy124

DO - 10.1093/icesjms/fsy124

M3 - Journal article

VL - 76

SP - 312

EP - 329

JO - I C E S Journal of Marine Science

JF - I C E S Journal of Marine Science

SN - 1054-3139

IS - 1

ER -