Thickness-weighted averaging in tidal estuaries and the vertical distribution of the eulerian residual transport

Knut Klingbeil, Johannes Becherer, Elisabeth Schulz, Huib E. de Swart, Henk M. Schuttelaars, Arnoldo Valle-Levinson, Hans Burchard

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Abstract

This paper presents thickness-weighted averaging (TWA) in generalized vertical coordinates as a unified framework for a variety of existing tidal-averaging concepts in seas and estuaries. Vertical profiles of resulting residual quantities depend on the specific vertical coordinate, which is held fixed during the averaging process. This dependence is demonstrated through the application to one-dimensional analytical tidal flow with sediment transport, to field observations from a tidal channel, and to model results from a two-dimensional estuary. The use of different coordinate systems provides complementary views on the residual dynamics and stresses the importance of a correct interpretation of residual quantities obtained by tidal averaging.

Original languageEnglish
Pages (from-to)1809-1826
Number of pages18
JournalJournal of Physical Oceanography
Volume49
Issue number7
DOIs
Publication statusPublished - 2019

Keywords

  • Estuaries
  • Vertical coordinates
  • Filtering techniques
  • Tides
  • Mass fluxes/transport
  • Baroclinic flows

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