Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 546841
Title Comparison of mechanical disturbance in soft sediments due to tickler-chain SumWing trawl vs. electro-fitted PulseWing trawl
Author(s) 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.
Source ICES Journal of Marine Science 76 (2019)1. - ISSN 1054-3139 - p. 312 - 329.
Department(s) Onderzoeksformatie
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) beam trawl - biogeochemistry - habitat impacts - Particle size distribution - penetration depth - pulse trawl - seafloor integrity - sediment resuspension
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 ¼ 0.7 cm; PulseWing trawl ¼ 0.8 cm). PulseWing trawls reduced most of the mechanical seabed impacts compared to SumWing trawls for this substrate and area characteristics.
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