Bedload transport in an inlet channel during a tidal cycle

V. B. Ernstsen, M. Becker, C. Winter, A. Bartholomä, B. W. Flemming, J. Bartholdy

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

2 Citations (Scopus)

Abstract

Based on high-resolution swath bathymetry measurements at centimetre-scale precision conducted during a tidal cycle in a dune field in the Grädyb tidal inlet channel in the DanishWadden Sea, a simple tool to calculate bedload transport is presented. Bedload transport was related to simultaneous flow measurements using an acoustic Doppler current profiler. Spatially, bedload transport was higher on the dune crests than in the dune troughs of the large ebb-directed compound dunes, due to higher flow velocities at the crests than in the troughs. Temporally, bedload transport was higher in the troughs of the large ebb-directed compound dunes during the flood tide than during the ebb tide, due to higher near-bed flow velocities in the troughs of the compound dunes during the flood tide as compared to the ebb tide, resulting from flow exposure, i.e. the trough-sheltering effect of the compound dunes being active during the ebb tide, but negligible during the flood tide. Bedload transport was also predicted using five classical and widely used formulae. These predictors were all unable to depict the temporal variation in bedload transport during the tidal cycle. It is suggested that temporal variations in grain-size composition of the mobilised sediment should be taken into account by sediment transport formulae.

Original languageEnglish
Title of host publicationRiver, Coastal and Estuarine Morphodynamics
Subtitle of host publicationRCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Pages351-358
Number of pages8
Publication statusPublished - 2008
Event5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007 - Enschede, Netherlands
Duration: 17 Sep 200721 Sep 2007

Publication series

NameRiver, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Volume1

Conference

Conference5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007
Country/TerritoryNetherlands
CityEnschede
Period17/09/0721/09/07

Programme Area

  • Programme Area 5: Nature and Climate

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