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Article

Sediment Characteristics over Asymmetrical Tidal Sand Waves in the Dutch North Sea

1
Department of Estuarine and Delta Systems (EDS), NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, Korringaweg 7, 4401NT Yerseke, The Netherlands
2
Water Engineering and Management, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands
*
Authors to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(6), 409; https://doi.org/10.3390/jmse8060409
Received: 15 April 2020 / Revised: 25 May 2020 / Accepted: 29 May 2020 / Published: 4 June 2020
The behavior of asymmetrical bedforms, which include many tidal sand waves, is challenging to understand. They are of particular interest since they are mostly located within areas prone to offshore engineering activities. Most experimental investigations regarding asymmetrical bedforms consider the riverine environment, are limited to a single sand wave or a few scattered ones, and focus only on differences between crest and trough. Hardly any information is available on sediment compositional changes along asymmetrical tidal sand waves, despite their abundance offshore. An asymmetrical sand wave field located off the coast of Texel Island in the North Sea was studied in June and October 2017. A total of 102 sediment samples were collected over two seasons along a single transect that covered five complete sand waves to measure the grain size composition, organic carbon concentration, chlorophyll-a (chl-a) concentration, and sediment permeability. We found significant variations in these sediment parameters between the sand wave trough, crest, and gentle and steep slopes, including a difference in permeability of more than 2-fold, as well as a difference in median grain size exceeding 65 µm. Based on these characteristics, a sand wave can be divided into two discrete halves: gentle slope + crest and steep slope + trough. Our results indicate a distinct sediment-sorting process along the Texel sand waves, with a significant difference between the two halves of each sand wave. These data could serve as input for process-based modeling of the link between sediment-sorting processes and seabed morphodynamics, necessary to design offshore engineering projects. View Full-Text
Keywords: seabed morphology; permeability; asymmetrical sand waves; North Sea; sediment characteristics; sandy shelf seas; biogeochemistry seabed morphology; permeability; asymmetrical sand waves; North Sea; sediment characteristics; sandy shelf seas; biogeochemistry
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MDPI and ACS Style

Cheng, C.H.; Soetaert, K.; Borsje, B.W. Sediment Characteristics over Asymmetrical Tidal Sand Waves in the Dutch North Sea. J. Mar. Sci. Eng. 2020, 8, 409. https://doi.org/10.3390/jmse8060409

AMA Style

Cheng CH, Soetaert K, Borsje BW. Sediment Characteristics over Asymmetrical Tidal Sand Waves in the Dutch North Sea. Journal of Marine Science and Engineering. 2020; 8(6):409. https://doi.org/10.3390/jmse8060409

Chicago/Turabian Style

Cheng, Chiu H., Karline Soetaert, and Bas W. Borsje 2020. "Sediment Characteristics over Asymmetrical Tidal Sand Waves in the Dutch North Sea" Journal of Marine Science and Engineering 8, no. 6: 409. https://doi.org/10.3390/jmse8060409

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