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 419895
Title Mixing and stratification in a tropical tidal embayment subject to a distributed freshwater source
Author(s) Hoitink, A.J.F.; Maren, D.S. van; Hoekstra, P.
Source Journal of Marine Systems 88 (2011)1. - ISSN 0924-7963 - p. 34 - 44.
Department(s) Hydrology and Quantitative Water Management
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) vertical structure - continental-shelf - coastal current - currents - sediment - region - plume - sea - bay - instability
Abstract The Bay of Banten provides an example of a semicircular shallow tidal embayment in a tropical ROFI (Region Of Freshwater Influence), subject to a mixed, mainly diurnal tidal regime and a monsoon-driven residual circulation. A partially inactivated delta shapes the east coast of the bay and constitutes a distributed source of freshwater during the wet season. Measurements of flow velocity, salinity and temperature were taken at two contrasting sites in the bay, to investigate stratification dynamics throughout a spring–neap cycle. Bulk Richardson numbers are shown to vary both at tidal and subtidal frequencies, and indicate that the water column occasionally remains stratified all through a tidal cycle. About half of the variance of the subtidal flow can be explained from wind forcing. The wind-driven flow varies between 1 and 5% of the wind speed, with a pronounced difference between the two locations under study. Stratification was further analyzed by estimating the contributions of advection by the depth–mean flow, tidal straining, vertical advection and heating, to variation in potential energy anomaly (PEA). To do so, horizontal gradients in density and PEA were estimated from multi-linear regression analysis. The obtained results show that spatial gradients of density and PEA can reverse sign frequently in the absence of strong mixing, associated to pulses of freshwater discharge. The freshwater discharge, in turn, is distributed over small streams. The contribution of vertical mixing was found to be relatively small, and none of the remaining terms were clearly dominant. Estimates of the boundary layer thickness of clockwise and anticlockwise rotary components of the tidal flow show the impact of baroclinic processes on velocity profiles. --------------------------------------------------------------------------------
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