Do tidal sand waves always regenerate after dredging?

Janneke M. Krabbendam, Marc Roche, Vera R. M. Van Lancker, Abdel Nnafie, Nathan Terseleer, Koen Degrendele, Huib E. De Swart

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Tidal sand waves are rhythmic bedforms found on sandy continental shelves that pose a threat to offshore activities. While emphasis is placed on studying their natural morphodynamic evolution, little is known about if and how fast sand waves recover after dredging. This work presents an analysis of multibeam echosounder data collected at three former sand extraction sites on the Belgian continental shelf. At one of the sites, sand waves seemed to reappear approximately 5 years after dredging had stopped, which did not happen at the other two sites during the measurement period (5 and 9 years). The lack of recovery in those sites is likely the result of larger depths and smaller local sediment availability compared with the site where recovery occurred. Furthermore, these data reveal that in the latter site sand wave recovery was established mainly through local sediment redistribution.

Tidal sand waves are isolated from bathymetric data of the Belgian continental shelf.


At only one of the three sites, sand waves seemed to regenerate after dredging.


Possible explanations are differences in water depth and local sediment availability.


The regenerating tidal sand waves do so as a result of local redistribution of sand.
Original languageEnglish
Article number106866
Pages (from-to)1-8
Number of pages8
JournalMarine Geology
Volume451
DOIs
Publication statusPublished - Sept 2022

Keywords

  • Tidal sand waves
  • Recovery after dredging
  • Shelf morphology and stratigraphy
  • Field observations
  • North Sea
  • Europe

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