New CCM technique for sheet flow measurements and its first application in swash zone experiments

J. van der Zanden, J.M. Alsina, I. Caceres, R.H. Buijsrogge, J.S. Ribberink

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Abstract

We present here a new conductivity-based system for measuring concentrations and grain velocities in the sheet-flow layer. The system is equipped with a new technique that translates measured concentrations back into vertical sensor movement, which enables the measuring probes to track a dynamic bed level. The new CCM system was applied for the first time during a series of swash zone experiments with bichromatic wave conditions. The results show a rapid erosion event with an erosion depth of an estimated 5 mm at the start of the uprush, after which the suspended sediment is advected to the upper swash. Sediment is transported back and deposited to the lower swash mainly during the second half of the backwash. The sheet-flow behaviour clearly differs from observations for non-breaking waves, with both the vertical concentration gradient and its mean vertical position varying within the wave group cycle.
Original languageEnglish
Title of host publicationProceedings of the 6th International Short Course/Conference on Applied Coastal Research, SCACR 2013, 4-7- June 2013, Lisbon, Portugal
EditorsF. Sancho, C. Fortes, R. Tomasicchio
Place of PublicationLisbon, Portugal
PublisherLNEC
Pages1-10
Publication statusPublished - 4 Jun 2013
Event6th International Short Course/Conference on Applied Coastal Research, SCACR 2013 - National Laboratory for Civil Engineering (LNEC), Lisbon, Portugal
Duration: 4 Jun 20137 Jun 2013
Conference number: 6
http://www.scacr.eu/

Conference

Conference6th International Short Course/Conference on Applied Coastal Research, SCACR 2013
Abbreviated titleSCACR
CountryPortugal
CityLisbon
Period4/06/137/06/13
Internet address

Keywords

  • METIS-296647
  • IR-90775

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