KNAW Repository

Ecological evaluation of an experimental beneficial use scheme for dredged sediment disposal in shallow tidal waters

Van der Wal, D. and Forster, R.M. and Rossi, F. and Hummel, H. and Ysebaert, T. and Roose, F. and Herman, P.M.J. (2011) Ecological evaluation of an experimental beneficial use scheme for dredged sediment disposal in shallow tidal waters. Marine Pollution Bulletin, 62, 99-108. ISSN 0025-326X.

[img]PDF - Published Version
Restricted to KNAW only

637Kb

Official URL: http://dx.doi.org/10.1016/j.marpolbul.2010.09.005

Abstract

An experiment was performed to test an alternative dredging strategy for the Westerschelde estuary. Clean sand dredged from the navigation channel was disposed seawards of an eroding intertidal flat in order to modify morphology and hydrodynamics, improving the multi-channel system with ecologically productive shallow water habitat. Five years of intensive monitoring revealed that part of the disposed sediment moved slowly towards the flat, increasing the very shallow subtidal and intertidal area, as planned. The sand in the impact zone became gradually finer after disposal, possibly due to reduced current velocities. Nevertheless, no changes in macrobenthic biomass, density, species richness and composition were detected in the subtidal zone, also demonstrating rapid macrobenthic recovery. In the intertidal zone, no ecological effects could be revealed superimposed on trends associated with long-term sediment fining. Thus, despite morphological success and absence of detected negative ecological impacts of the experiment, new beneficial habitat was not created.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:8833
Deposited On:04 Jan 2011 01:00
Last Modified:31 Mar 2014 10:49

Repository Staff Only: item control page