Sediment Characteristics over Asymmetrical Tidal Sand Waves in the Dutch North Sea
| Autor: | Karline Soetaert, Chiu Hwa Cheng, Bas W. Borsje |
|---|---|
| Přispěvatelé: | Marine and Fluvial Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Bedform 010504 meteorology & atmospheric sciences Trough (geology) Ocean Engineering 01 natural sciences Permeability lcsh:Oceanography lcsh:VM1-989 biogeochemistry asymmetrical sand waves North sea Sediment characteristics lcsh:GC1-1581 Seabed morphology sandy shelf seas Geomorphology Seabed 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering 010604 marine biology & hydrobiology lcsh:Naval architecture. Shipbuilding. Marine engineering Biogeochemistry Grain size Offshore geotechnical engineering sediment characteristics Sandy shelf seas seabed morphology Submarine pipeline Crest Asymmetrical sand waves North Sea permeability Beach morphodynamics Geology |
| Zdroj: | Journal of Marine Science and Engineering Volume 8 Issue 6 Journal of Marine Science and Engineering, 8(6) Journal of Marine Science and Engineering, Vol 8, Iss 409, p 409 (2020) Journal of Marine Science and Engineering 8 (2020) 6 Journal of marine science and engineering, 8(6):409. MDPI |
| ISSN: | 2077-1312 |
| DOI: | 10.3390/jmse8060409 |
| Popis: | 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 µ m. 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. |
| Databáze: | OpenAIRE |
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