River widening to mitigate river training induced bed erosion: A 1D model approach

R.M.J. Schielen, H.J. Barneveld, M. van den Bergh, A Spruyt

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The Waal river in the Netherlands is experiencing a bed degradation of 2-3 cm per year. This is most probably the result of river training measures in the past, as well as the construction of dams in the upstream part. Bed degradation causes hindrance for shipping and may lead to groundwater issues in the floodplains. River widening (e.g. by large scale floodplain lowering) affects the slope of the river bed and hence reduces bed degradation. In this study, we analyze the morphological changes as a result of river widening, using a 1D morphological model (with mixed size sediment) with which we performed long-term (100 years) simulations for a long river stretch (order of 100 km) . First results show that the model is able to reflect the changes in slope correctly, but that only river widening itself is not sufficient to stop the degradation. Additional simulations with upstream sediment nourishments show that still substantial volumes are needed to stabilize the bed. These preliminary results may already be used for policy preparations but fine-tuning with a 2D model is necessary, before actual management decisions can be taken.
Original languageEnglish
Title of host publicationRiver Flow 2020
Subtitle of host publicationProceedings of the 10th Conference on Fluvial Hydraulics
EditorsW. Uijttewaal, M.J. Franca, D. Valero, V. Chavarrias, C.Y. Arbos, R. Schielen, A. Crosato
Place of PublicationLondon
PublisherCRC Press / Balkema
Pages1810-1815
Number of pages6
Edition1st
ISBN (Electronic)978-1-003-11095-8
ISBN (Print)978-0-367-62773-7
Publication statusPublished - 2020
EventRiver Flow 2020: The 10th Conference on Fluvial Hydraulics - Delft, Netherlands
Duration: 7 Jul 202010 Jul 2020

Conference

ConferenceRiver Flow 2020
CountryNetherlands
CityDelft
Period7/07/2010/07/20

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