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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Density effects in the braakmanhaven
Density effects in the braakmanhaven
Author : S.E. POORTMAN(1), H. TALSTRA(2) & A.J. BLIEK(3)
The effects of density differences on the flow pattern in the entrance of the Braakmanhaven, a port in the well-mixed
Scheldt estuary, have been investigated by means of field measurements and a non-hydrostatic three-dimensional
numerical flow model named FINEL3D. Two modelling scenarios have been investigated: (a) with realistic salinity
variations (as function of the tide) in the estuary, and (b) without salinity variation. This has provided insight how density
differences in the Western Scheldt do influence the flow pattern in the port entrance.
The realistic model simulation shows a three-dimensional flow pattern in the port entrance in good agreement with the
measured current patterns. During the ebb period, outflow occurs in the upper part of the water column and inflow in the
lower part of the water column. During the flood period these flow directions are reversed. The over-all spatial density
variation is only limited. The simulated current pattern of the model run without salinity variation shows no threedimensional
effects in the port entrance and hence no agreement with the current measurements.
The model simulations show that density differences in the Western Scheldt, though small, have a significant impact on
the flow pattern in the entrance of the Braakmanhaven. Since the suspended sediment concentration in the incoming
near-bed current is relatively high, small density differences over the tidal period are in fact an important factor for the
siltation of the port. It is expected that small density differences are of importance as well for siltation processes in other
ports along 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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