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Monitoring the effects of disposal of fine sediments from maintenance dredging on suspended particulate matter concentration in the Belgian nearshore area
Fettweis, M.; Baeye, M.; Francken, F.; Lauwaert, B.; Van den Eynde, D.; Van Lancker, V.; Martens, C.; Michielsen, T. (2012). Monitoring the effects of disposal of fine sediments from maintenance dredging on suspended particulate matter concentration in the Belgian nearshore area, in: Baeye, M. Hydro-meteorological influences on the behaviour and nature of sediment suspensions in the Belgian-Dutch coastal zone = Hydro-meteorologische effecten op het gedrag en samenstelling van sedimentsuspensies in de Belgisch-Nederlandse kustzone. pp. 131-150
In: Baeye, M. (2012). Hydro-meteorological influences on the behaviour and nature of sediment suspensions in the Belgian-Dutch coastal zone = Hydro-meteorologische effecten op het gedrag en samenstelling van sedimentsuspensies in de Belgisch-Nederlandse kustzone. PhD Thesis. Ghent University: Ghent. 170 pp.
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Dredged material disposal; dredging; fluid mud; SPM concentration; suspended sediments; monitoring
Authors  Top 
  • Fettweis, M.
  • Baeye, M.
  • Francken, F.
  • Lauwaert, B.
  • Van den Eynde, D.
  • Van Lancker, V.
  • Martens, C.
  • Michielsen, T.
Abstract
    The impact of continuous disposal of fine-grained sediments from maintenance dredging works on the suspended particulate matter concentration in a shallow nearshore turbidity maximum was investigated during dredging experiment (port of Zeebrugge, southern North Sea). Before, during and after the experiment monitoring of SPM concentration using OBS and ADV altimetry was carried out at a location 5 km west of the disposal site. A statistical analysis, based on the concept of populations and sub-sampling, was applied to evaluate the effect. The data revealed that the SPM concentration near the bed was on average more than 2 times higher during the dredging experiment. The disposed material was mainly transported in the benthic layer and resulted in a long-term increase of SPM concentration and formation of fluid mud layers. The study shows that SPM concentration can be used as an indicator of environmental changes if representative time-series are available.
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