Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 401632
Title Tidal and subtidal flow patterns o a tropical continental shelf semi-insulated by coral reefs
Author(s) Tarya, A.; Hoitink, A.J.F.; Vegt, M. van der
Source Journal of Geophysical Research: Oceans 115 (2010). - ISSN 2169-9275 - 16 p.
Department(s) Hydrology and Quantitative Water Management
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) great barrier-reef - residual currents - barotropic tides - transport - model - ocean - sea - circulation - sediment - strait
Abstract The present study sets out to describe the tidal and subtidal water motion at the Berau coastal shelf, which represents a tropical continental shelf area of variable width hosting a complex of barrier reefs along its oceanic edge. Moored and shipboard measurements on currents and turbulence were made as part of the multidisciplinary East Kalimantan Research Program. These results and collected data on sea levels, meteorology and bathymetry, were used to setup and calibrate a three-dimensional barotropic hydrodynamic model in the ECOMSED environment, which is derived from the Princeton Ocean Model. Concurrent profile measurements of flow velocity and Reynolds stress with an acoustic Doppler current profiler were used to infer values of the drag coefficient on locations on the shelf and within the barrier reef environment. The drag coefficients determined from shelf measurements differed less than 20% from optimal model settings. Diurnal and semidiurnal tides have the same character, propagating across the isobaths with amplitudes that increase toward the coast. The tidal amplification is captured in a one-dimensional model, revealing an analogy with the Amazon Shelf. Regarding the subtidal depth-mean flow, tidal Eulerian residual currents dominate over monsoon-driven currents. Lagrangian mean flows reveal freshwater pathways from the coast to the coral reef environment. At a regional scale, the reef complex is established to be semitransparent to tides. The barrier reef influences the tidal phases rather than the amplitudes, especially in the shelf region that is fringed by the reefs. This may explain why tidal phases predicted from hydrodynamic models of tropical continental shelves often feature substantial discrepancies from observations.
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