defining and assessing benthic recovery following dredging and dredged material disposal

Fangeffizienz von Entnahmegeräten zur Besammlung der aquatischen Bodenfauna von Weichsedimenten. Continental Shelf Research 26: 804–818.Ĭharousek, F. The benthic community of the eastern US continental shelf: a literature synopsis of benthic faunal resources. Environmental Management 32: 171–188.īrooks, R. Minimizing impacts of maintenance dredged material disposal in the coastal environment: a habitat approach.

Linzer Biologische Beitraege 26: 365–380.īolam, S. Neue eintagsfliegen-nachweise aus österreich. Verhandlungen der Zoologisch-Botanischen Gesellschaft in Österreich 128: 47–66.īauernfeind, E. Eintagsfliegen-Nachweise aus Österreich (Insecta: Ephemeroptera). As a rough estimate (conferring to a simple trend line analysis) the harbour bottom fauna would recover after 235 days.īauernfeind, E. It found that the sediment dredging heavily affected the benthic invertebrates (decline of 82% of biomass), while the dumping of the material had no effects on the benthic Danube biota. The study used an air-lift sampler and a grab sampler to investigate if and to what extent the benthic invertebrate community is disturbed. Four transects were documented in the affected river section. One sampling at Linz Harbour was conducted before dredging and four samplings were carried out after dredging. This study presents the first quantitative information on the colonisation of benthic invertebrates with respect to Danube harbours.

The effects of harbour dredging on the biota need to be studied to minimize possible outcomes that may endanger the ecological status of the river system in order to implement the aims of the European Water Framework Directive. In most cases, the excavated substrate is deposited in the free-flowing river section in the vicinity of the mouth of a harbour. Dredging Austrian Danube harbours becomes necessary to keep the navigation channel free from bed sediment and to insure safe navigation, especially after major floods.

Defining and assessing benthic recovery following dredging and dredged material disposal