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Modelling impact of dredging and dumping in ebb-flood channel systems
(2004). Modelling impact of dredging and dumping in ebb-flood channel systems, in: Hibma, A. Morfodynamisch modelleren van estuarine plaat-geul systemen = Morphodynamic modelling of estuarine channel-shoal systems. Communications on Hydraulic and Geotechnical Engineering, 04-3: pp. 93-108
In: Hibma, A. (2004). Morfodynamisch modelleren van estuarine plaat-geul systemen = Morphodynamic modelling of estuarine channel-shoal systems. Communications on Hydraulic and Geotechnical Engineering, 04-3. PhD Thesis. Technische Universiteit Delft: Delft. ISBN 90-9017987-9. 143 pp., more
In: Communications on Hydraulic and Geotechnical Engineering. Delft University of Technology. Department of Civil Engineering: Delft. ISSN 0169-6548, more

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Author keywords
    channel hydraulics; dredge spoil; dredging; estuarine environment; morphodynamics; numerical model; sediment transport; Benelux; Eurasia; Europe; Netherlands; Western Europe; Westerschelde; Zeeland

Abstract
    For a channel shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which formed the inspiration for this study. Subsequently, different dredge and dump scenario's are modelled, according to a conceptual model, in which ebb- and flood channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system onto a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.

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