6.2 Integrated Estuary Management
149
Fig. 6.10 The multichannel system of the Schelde consists of ebb- and flood-dominated channels.
The yellow arrow shows the flow-direction of the flood current and the green arrow shows the flow
direction of the ebb current. Sand plates intersect the channel system which suffer erosion. Important
estuarine habitats are either drowning or diminish. Eroded material is disposed within the channels.
Source: APA (2012)
of the channels vary and flood-dominated channels are more shallow. A detailed description of the morphological development at the Schelde and the prospects would go beyond
the scope of this book, but can be found, for example, in Mol (1995); Wang et al. (2002);
Jeuken et al. (2013); Coen (2008); Jeuken and Wang (2010); APA (2012); Deltares (2013);
Vandenbruwaene et al. (2013); Winterwerp (2013); VNSC (2013, 2014) and IAHR (2015).
Two main transport directions of sand exist in the estuary: From the outer reach (near
the mouth) sand is exported into the North Sea. In the upper reaches sand is transported
upstream to the harbor of Antwerp. For silt the situation is different, it is imported through
the whole length of the estuary and partly accumulates at the harbor of Antwerp (VNSC,
2013).
To effectively manage the morphological development of the Schelde so-called morphological cells were defined (Fig. 6.11, e.g., Jeuken and Wang 2010; Deltares 2012).
An estuary consisting of a multiple channel system is in the transition between completely
drowning without inter tidal areas or the opposite complete siltation, depending on specific
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