NDLI: The impact of disposal of fine-grained sediments from maintenance dredging works on SPM concentration and fluid mud in and outside the harbor of Zeebrugge

Content Provider	Springer Nature Link
Author	Fettweis, Michael Baeye, Matthias Cardoso, Claudio Dujardin, Arvid Lauwaert, Brigitte Van den Eynde, Dries Van Hoestenberghe, Thomas Vanlede, Joris Van Poucke, Luc Velez, Carlos Martens, Chantal
Copyright Year	2016
Abstract	The amount of sediments to be dredged and disposed depends to a large part on the suspended particulate matter (SPM) concentration. Tidal, meteorological, climatological, and seasonal forcings have an influence on the horizontal and vertical distribution of the SPM in the water column and on the bed and control the inflow of fine-grained sediments towards harbors and navigation channels. About 3 million tons (dry matter) per year of mainly fine-grained sediments is dredged in the port of Zeebrugge and is disposed on a nearby disposal site. The disposed sediments are quickly resuspended and transported away from the site. The hypothesis is that a significant part of the disposed sediments recirculates back to the dredging places and that a relocation of the disposal site to another location at equal distance to the dredging area would reduce this recirculation. In order to validate the hypothesis, a 1-year field study was set up in 2013–2014. During 1 month, the dredged material was disposed at a new site. Variations in SPM concentration were related to tides, storms, seasonal changes, and human impacts. In the high-turbidity Belgian near-shore area, the natural forcings are responsible for the major variability in the SPM concentration signal, while disposal has only a smaller influence. The conclusion from the measurements is that the SPM concentration decreases after relocation of the disposal site but indicate stronger (first half of field experiment) or weaker (second half of field experiment) effects that are, however, supported by the environmental conditions. The results of the field study may have consequences on the management of disposal operations as the effectiveness of the disposal site depends on environmental conditions, which are inherently associated with chaotic behavior.
Starting Page	1497
Ending Page	1516
Page Count	20
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	66
Issue Number	11
e-ISSN	16167228
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-09-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	SPM concentration Dredging and disposal operations Long-term observational time series Oceanography Geophysics/Geodesy Atmospheric Sciences Fluid- and Aerodynamics Monitoring/Environmental Analysis
Content Type	Text
Resource Type	Article
Subject	Oceanography

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