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Morphological evolution of the Kwinte Bank Central Depression before and after the cessation of aggregate extraction

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Abstract
Analyses of the records of ships registers and Electronic Monitoring Systems, of the trailer suction hopper dredgers, operating on the Belgian Continental Shelf, reveal that since the beginning of extraction in 1976, 75% of the total extracted volume originates from only one sandbank, the Kwinte Bank. At present, two morphologically-distinguished depressions are observed along the two most dredged areas of this sandbank: one in the central; and one in the northern part of the bank. In order to limit the impact of sand extraction on the bathymetry, the central depression of the Kwinte Bank was closed for exploitation, in February 2003. An understanding of the morphological evolution of this central depression is based upon data obtained: (a) from November 1999, until the closure for extraction in February 2003; and (b) on the subsequent post-dredging evolution, until June 2005. During this 5-year period, a total of 17 surveys were carried out with a multibeam echosounder over the area of the central depression (KBMA) and over a reference zone on an adjacent non-exploited sandbank. The resulting time-series of bathymetrical digital terrain models, together with backscatter strength maps, permit a detailed comparison of the bathy-morphological and sedimentary evolution of both of the monitored areas. Since the commencement of multibeam monitoring in 1999, an overall deepening (by 0.5m) of the entire KBMA monitoring zone is observed, until the cessation of dredging, in February 2003. Subsequently, the deepening slowed down and the variation in sediment volumes became similar to that of the adjacent non-exploited sandbank. From this, marine aggregate extraction appears to have only a local impact.
Keywords
bathymetry, multibeam echosounder, morphology, seabed, imagery, monitoring, marine sand extraction, aggregate extraction, SOUTHERN NORTH-SEA, MIDDELKERKE BANK, sandbank, North Sea, dredging

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Chicago
Degrendele, Koen, Marc Roche, Patrik Schotte, Vera Van Lancker, Valérie Bellec, and Wendy Bonne. 2010. “Morphological Evolution of the Kwinte Bank Central Depression Before and After the Cessation of Aggregate Extraction.” Journal of Coastal Research (special issue 51): 77–86.
APA
Degrendele, K., Roche, M., Schotte, P., Van Lancker, V., Bellec, V., & Bonne, W. (2010). Morphological evolution of the Kwinte Bank Central Depression before and after the cessation of aggregate extraction. JOURNAL OF COASTAL RESEARCH, (special issue 51), 77–86.
Vancouver
1.
Degrendele K, Roche M, Schotte P, Van Lancker V, Bellec V, Bonne W. Morphological evolution of the Kwinte Bank Central Depression before and after the cessation of aggregate extraction. JOURNAL OF COASTAL RESEARCH. 2010;(special issue 51):77–86.
MLA
Degrendele, Koen, Marc Roche, Patrik Schotte, et al. “Morphological Evolution of the Kwinte Bank Central Depression Before and After the Cessation of Aggregate Extraction.” JOURNAL OF COASTAL RESEARCH special issue 51 (2010): 77–86. Print.
@article{1089469,
  abstract     = {Analyses of the records of ships registers and Electronic Monitoring Systems, of the trailer suction hopper dredgers, operating on the Belgian Continental Shelf, reveal that since the beginning of extraction in 1976, 75\% of the total extracted volume originates from only one sandbank, the Kwinte Bank. At present, two morphologically-distinguished depressions are observed along the two most dredged areas of this sandbank: one in the central; and one in the northern part of the bank. In order to limit the impact of sand extraction on the bathymetry, the central depression of the Kwinte Bank was closed for exploitation, in February 2003.
An understanding of the morphological evolution of this central depression is based upon data obtained: (a) from November 1999, until the closure for extraction in February 2003; and (b) on the subsequent post-dredging evolution, until June 2005. During this 5-year period, a total of 17 surveys were carried out with a multibeam echosounder over the area of the central depression (KBMA) and over a reference zone on an adjacent non-exploited sandbank. The resulting time-series of bathymetrical digital terrain models, together with backscatter strength maps, permit a detailed comparison of the bathy-morphological and sedimentary evolution of both of the monitored areas.
Since the commencement of multibeam monitoring in 1999, an overall deepening (by 0.5m) of the entire KBMA monitoring zone is observed, until the cessation of dredging, in February 2003. Subsequently, the deepening slowed down and the variation in sediment volumes became similar to that of the adjacent non-exploited sandbank. From this, marine aggregate extraction appears to have only a local impact.},
  author       = {Degrendele, Koen and Roche, Marc and Schotte, Patrik and Van Lancker, Vera and Bellec, Val{\'e}rie and Bonne, Wendy},
  issn         = {0749-0208},
  journal      = {JOURNAL OF COASTAL RESEARCH},
  keyword      = {bathymetry,multibeam echosounder,morphology,seabed,imagery,monitoring,marine sand extraction,aggregate extraction,SOUTHERN NORTH-SEA,MIDDELKERKE BANK,sandbank,North Sea,dredging},
  language     = {eng},
  number       = {special issue 51},
  pages        = {77--86},
  title        = {Morphological evolution of the Kwinte Bank Central Depression before and after the cessation of aggregate extraction},
  url          = {http://dx.doi.org/10.2112/SI51-007.1},
  year         = {2010},
}

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