Processes and effects of reversing currents on the erosion stability of wide-graded grain material

authored by

A. Schendel, N. Goseberg, T. Schlurmann

Abstract

Physical model tests were carried out in a closed-circuit flume to investigate the overall erosion stability of wide-graded bed material in estuarine and coastal conditions by means of simulating tidal flow conditions with reversing currents. As a result of the reversing flow conditions, previously protected sediment eventually becomes exposed again, leading to bidirectional displacement processes in dependency of the flow direction. Furthermore, sediment fractions are slightly coarser under the following reversed flow than under the initial flow. This indicates higher critical shear stresses and thus erosion stability for the initial flow direction. In comparison to unidirectional current, this study finds a higher erosion stability for sediment fractions smaller than the median d₅₀ diameter of the initial bed material under reversed current conditions.

Organisation(s)

Ludwig-Franzius-Institute of Hydraulics, Estuarine and Coastal Engineering

External Organisation(s)

University of Ottawa

Type

Conference contribution

Pages

402-410

No. of pages

9

Publication date

2017

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Environmental Science(all)

Electronic version(s)

https://www.researchgate.net/profile/Alexander_Schendel/publication/308750270_Processes_and_Effects_of_Reversing_Currents_on_the_Erosion_Stability_of_Wide-graded_Grain_Material/links/5b114601a6fdcc4611da2b88/Processes-and-Effects-of-Reversing-Currents-on-the-Erosion-Stability-of-Wide-graded-Grain-Material.pdf (Access: Open)
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85016572598&partnerID=40&md5=f467d6cf23f8259a976e7c04c9482a88 (Access: Unknown)