Channel-shoal sediment exchange caused by tidal and subtidal flows

Poster (2022)

Authors

Ton Hoitink Wageningen University & Research

D.S. van Maren Environmental Fluid Mechanics -

Jan Boersma Wageningen University & Research

Bart Vermeulen University of Twente

Reinier Schrijvershof Wageningen University & Research

Research Group

Environmental Fluid Mechanics () (TU Delft)

More Info

expand_more

To reference this document use:

http://resolver.tudelft.nl/uuid:bb466b76-7f1f-404f-b098-5e0b04e4c077

Published Date

2022

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Environmental Fluid Mechanics

Abstract

The Ems Estuary presents an enigmatic environment where a
storm-generated intertidal basin interacts with a navigation channel
subject to extremely high suspended sediment concentrations. Despite ebb
dominance in parts of the navigation channel, the residual transport is
directed landward, necessitating continuous maintenance dredging. The
puzzling context has led to the suspicion that the intertidal basin
delivers sediment to the main channel, rather than acting as a storage
area. A field campaign has been setup to quantify and analyze suspended
sediment transport processes controlling the sediment balance in a
rectangular control volume over the width of the navigation channel,
which is bounded on one side by the intertidal basin. The control volume
is chosen exactly in the stratified region where the tidal flow
switches from ebb dominant to flood dominant. Standard equipment
including multifrequency ADCPs, a CTS, a LISST200X, and an OBS were
employed, and new frame was developed to obtain centimeter scale
velocity profiles of the bottom meter. Results reveal the mechanism by
which the intertidal basin plays a key role in the residual landward
sediment transport in the navigation channel.