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Geo-environmental characterization of the Kwinte Bank

Valérie Bellec, Vera Van Lancker UGent, Koen Degrendele, Marc Roche and Sophie Le Bot (2010) JOURNAL OF COASTAL RESEARCH. p.63-76
abstract
A detailed geomorphological and sedimentological study has been performed at a tidal sandbank, which has been dredged during 30 years. Localised intensive aggregate extraction created a depression in the central part of the sandbank, upon which the Government decided to close this section of the bank for further exploitation. Multibeam and side-scan sonar technology was used to survey the bank, in combination with extensive ground-truthing. Automated seabed classification was performed, but showed no direct correlation with the mean grain-size; the primary drivers influencing the classification being the sorting of the sediments, the presence of shells and of fine sediments. Very high resolution seismics revealed the internal architecture of the bank. In the central depression, the upper unit is locally severely dredged. The central depression is characterized by distinct morphosedimentary facies, compared to the western and eastern part of the bank and the Kwinte swale, adjacent of it. The difference between the western and the eastern part is essentially due to different tidal current characteristics, each having their particular sedimentation-erosion patterns. These processes seem to be rather stable, though the evolution of the sediments in the central depression shows similarities with the Kwinte swale sediment evolution. Since the depression is somewhat oblique to the normal crestline, it now forms an open transport pathway from the swale up to the crest of the sandbank. This led to a canalization of the flood current which is witnessed mostly by the northwards and faster progression of bedforms. Because of the difference in sediment characteristics between the dredged material and the present-day supply of sand, it is unlikely that natural processes will be able to counterbalance the severe dredging activities. Moreover, the presence of the central depression is located close to the kink of the sand bank, which is influenced by a high-energy hydrodynamic regime. Its presence could intensify the current action in this area and could enhance the evolution of the bank.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
STRAIT, TRANSPORT, STORMS, SCALE, BIGHT, DOVER, SUSPENSION, SEDIMENTOLOGY, SOUTHERN NORTH-SEA, SAND BANKS, dredging, seabed classification, acoustic imagery, sandbank, North Sea
journal title
JOURNAL OF COASTAL RESEARCH
J. Coast. Res.
issue
special issue 51
pages
63 - 76
Web of Science type
Article
Web of Science id
000284439100006
JCR category
GEOGRAPHY, PHYSICAL
JCR impact factor
0.679 (2010)
JCR rank
32/42 (2010)
JCR quartile
4 (2010)
ISSN
0749-0208
DOI
10.2112/SI51-006.1
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1089450
handle
http://hdl.handle.net/1854/LU-1089450
date created
2010-12-20 08:22:20
date last changed
2010-12-20 11:24:33
@article{1089450,
  abstract     = {A detailed geomorphological and sedimentological study has been performed at a tidal sandbank, which has been dredged during 30 years. Localised intensive aggregate extraction created a depression in the central part of the sandbank, upon which the Government decided to close this section of the bank for further exploitation. Multibeam and side-scan sonar technology was used to survey the bank, in combination with extensive ground-truthing. Automated seabed classification was performed, but showed no direct correlation with the mean grain-size; the primary drivers influencing the classification being the sorting of the sediments, the presence of shells and of fine sediments. Very high resolution seismics revealed the internal architecture of the bank. In the central depression, the upper unit is locally severely dredged.
The central depression is characterized by distinct morphosedimentary facies, compared to the western and eastern part of the bank and the Kwinte swale, adjacent of it. The difference between the western and the eastern part is essentially due to different tidal current characteristics, each having their particular sedimentation-erosion patterns. These processes seem to be rather stable, though the evolution of the sediments in the central depression shows similarities with the Kwinte swale sediment evolution.
Since the depression is somewhat oblique to the normal crestline, it now forms an open transport pathway from the swale up to the crest of the sandbank. This led to a canalization of the flood current which is witnessed mostly by the northwards and faster progression of bedforms. Because of the difference in sediment characteristics between the dredged material and the present-day supply of sand, it is unlikely that natural processes will be able to counterbalance the severe dredging activities.
Moreover, the presence of the central depression is located close to the kink of the sand bank, which is influenced by a high-energy hydrodynamic regime. Its presence could intensify the current action in this area and could enhance the evolution of the bank.},
  author       = {Bellec, Val{\'e}rie and Van Lancker, Vera and Degrendele, Koen and Roche, Marc and Le Bot, Sophie},
  issn         = {0749-0208},
  journal      = {JOURNAL OF COASTAL RESEARCH},
  keyword      = {STRAIT,TRANSPORT,STORMS,SCALE,BIGHT,DOVER,SUSPENSION,SEDIMENTOLOGY,SOUTHERN NORTH-SEA,SAND BANKS,dredging,seabed classification,acoustic imagery,sandbank,North Sea},
  language     = {eng},
  number       = {special issue 51},
  pages        = {63--76},
  title        = {Geo-environmental characterization of the Kwinte Bank},
  url          = {http://dx.doi.org/10.2112/SI51-006.1},
  year         = {2010},
}

Chicago
Bellec, Valérie, Vera Van Lancker, Koen Degrendele, Marc Roche, and Sophie Le Bot. 2010. “Geo-environmental Characterization of the Kwinte Bank.” Journal of Coastal Research (special issue 51): 63–76.
APA
Bellec, V., Van Lancker, V., Degrendele, K., Roche, M., & Le Bot, S. (2010). Geo-environmental characterization of the Kwinte Bank. JOURNAL OF COASTAL RESEARCH, (special issue 51), 63–76.
Vancouver
1.
Bellec V, Van Lancker V, Degrendele K, Roche M, Le Bot S. Geo-environmental characterization of the Kwinte Bank. JOURNAL OF COASTAL RESEARCH. 2010;(special issue 51):63–76.
MLA
Bellec, Valérie, Vera Van Lancker, Koen Degrendele, et al. “Geo-environmental Characterization of the Kwinte Bank.” JOURNAL OF COASTAL RESEARCH special issue 51 (2010): 63–76. Print.