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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : The impacts of bathymetry and geometry on salt dynamics in well-mixed estuaries
The impacts of bathymetry and geometry on salt dynamics in well-mixed estuaries
Understanding salt dynamics is of great importance to adequately model salt intrusion, baroclinic forcing and
sediment transport. In this contribution, we focus on the importance of estuarine bathymetry and geometry on
the residual salt transport. An idealized three dimensional model is set up which couples the water motion and
salt dynamics for well-mixed estuaries. The tidal velocities and salinity components up to the second order are
obtained semi-analytically using a perturbation method, where quantities are expanded in a small parameter
(the ratio of the M2 tidal amplitude to the water depth at the estuarine mouth). The model resolves several residual
salt transport processes, i.e., the tidal advection due to the correlation between tidal velocity and salinity, and
estuarine circulation in both the longitudinal and lateral directions. The unresolved processes are parametrized
as diffusive processes using a prescribed along-channel diffusion coefficient Kx, and a cross-channel diffusion
coefficient Ky. The response of the salinity distribution for varying estuarine bathymetry and geometry will be
investigated, and the relative importance of each salt transport mechanism will be discussed. The results will
help to understand the change of salt intrusion as observed in, for example, the Pearl River Estuary, and can
provide a scientific basis for estimating salt intrusion in real estuaries.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 19/08/2015
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