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The authors are solely responsible for the content of this report. Material included herein does not represent the opinion of the European Community, and the European Community is not responsible for any use that might be made of it.
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In the Flemish part of the Scheldt estuary 2 locations are available for relocation of sandy dredged material. The first one, 'Schaar Ouden Doel', is in use for more than a century as a site for relocation of sandy dredged material for sand extraction. The second location, two deep areas in the fairway near the 'Ketelplaat', is available since the start of the 3rd deepening programme (February 10th, 2010) and has an area of 88 hectares. At the latter location, a sediment volume of 562.621 m³ (vessel-volume) is relocated from March 8th until March 29th, 2010. The morphological behaviour of the relocated material was assessed as reference for planned numerical morphological modelling for similar relocation on a larger scale. The general aim of the pilot measure consists of three sub-objectives: report on available data on the relocation test; analysis of the bathymetric changes based on historical measurements with special attention to the nearby ‘Drempel van Lillo’ and ‘Drempel van de Parel’; and analysis of the morphologic changes before (10 years), during (3 weeks) and after (7 months) the relocation test (IMDC 2011). The dredging activities took place outside the study area and are therefore of minor importance for this study. However, data on dredged volumes are collected to analyse material fluxes, in particular the behavior of the relocated material in the deeper areas of the navigation channel.
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TIDE pilot project 2: Navigation channel near Ketelplaat – Relocation of dredged sediment to deep areas of the navigation channel
Table of content
- 1. Description of measure
- 1a. Measure description
- 1b. Monitoring
- 1c. Monitoring results
- 2. Execution of main effectiveness criteria
- 2a. Effectiveness according to development targets of measure
- 2b. Impact on ecosystem services
- 2c. Degree of synergistic effects and conflicts according to uses
- 3. Additional evaluation criteria in view of EU environmental law
- 3a. Degree of synergistic effects and conflicts according to WFD aims
- 3b. Degree of synergistic effects and conflicts according to Natura 2000 aims
- 4. Crux of the matter
- 5. References
Additional information
for this measure:
No further information available.
for this measure:
No further information available.
Measure description
In several estuaries, including the Scheldt estuary, tidal amplitude and propagation are steadily increasing in the last decades. Climate change could even exacerbate this trend due to elevated sea levels. To ensure safety against flooding in the future, we should find methods to affect tidal currents. One method could be to relocate sediment in such a way that tidal energy dissipation is maximised. The effectiveness of such a method is determined by the timescale that the relocated sediment remains in place. The measure discussed here is a trial to estimate the erosion rate of sediment that was relocated to a deep area in the navigation channel of the Scheldt estuary.In the Flemish part of the Scheldt estuary 2 locations are available for relocation of sandy dredged material. The first one, 'Schaar Ouden Doel', is in use for more than a century as a site for relocation of sandy dredged material for sand extraction. The second location, two deep areas in the fairway near the 'Ketelplaat', is available since the start of the 3rd deepening programme (February 10th, 2010) and has an area of 88 hectares. At the latter location, a sediment volume of 562.621 m³ (vessel-volume) is relocated from March 8th until March 29th, 2010. The morphological behaviour of the relocated material was assessed as reference for planned numerical morphological modelling for similar relocation on a larger scale. The general aim of the pilot measure consists of three sub-objectives: report on available data on the relocation test; analysis of the bathymetric changes based on historical measurements with special attention to the nearby ‘Drempel van Lillo’ and ‘Drempel van de Parel’; and analysis of the morphologic changes before (10 years), during (3 weeks) and after (7 months) the relocation test (IMDC 2011). The dredging activities took place outside the study area and are therefore of minor importance for this study. However, data on dredged volumes are collected to analyse material fluxes, in particular the behavior of the relocated material in the deeper areas of the navigation channel.