Sediment characteristics and sedimentation-erosion processes on Ketenisse polder one year after levelling
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Publication Authorstring : Verbessem, I.; Van den Bergh, E.; De Regge, N.; Soors, J.; De Belder, W.; De Groot, R.
Publication RefStringPartII : <i>Aquatic Ecosystem Health & Management 10(1)</i>: 87-92. <a href="http://dx.doi.org/10.1080/14634980701194027" target="_blank">dx.doi.org/10.1080/14634980701194027</a>
TheKetenisse polder is a former intertidal brackish marsh of 30 ha situated between the fortress of Liefkenshoek
and the Kallo sluice on the left bank of the Schelde estuary, Belgium. In the 19th century its central part was
embanked as a polder. During the construction of a traffic tunnel in the late eighties, the excavated soil was
dumped between a lower summer dike and the damming dike. The area was restored in 2002 as compensation
for the construction of a container terminal on a mudflat in 1994-1995. The rubble of the summer dike and the
dumped material were removed and the area was levelled with the intention of creating the optimal starting
conditions for the development of new tidal mudflats and marshes.
Developments concerning morphology, sediment characteristics and sedimentation-erosion processes are
monitored. Six transects with sedimentation-erosion plots were placed perpendicular to the shoreline. This
article discusses those monitoring results, mainly for the first year after levelling.
Sedimentation as well as erosion between 0 and 30 cm was observed in the first year. Local changes in stream
current patterns caused erosion on some parts of the former mudflats; sheltered depressions filled up relatively
fast. Median grain size showed large variation, both spatial and temporal. Organic matter content of the sediment varied between 0.5 and 15% and was closely related to sediment median grain size.
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