Modelling erosion of pre-embankment breaches in coversand ridges in the IJssel floodplain due to major flood events in medieval times

Roy Dierx*, Anouk Bomers, Kim Cohen, Suzanne Hulscher

*Corresponding author for this work

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Abstract

Coversand ridges are natural elevated areas that formed in the last part of the glacial period due to wind transport. Some coversand ridges created a watershed between the Rhine and IJssel floodplain. Erosion of these coversand ridges was of major influence for the formation of the river IJssel as a Rhine delta distributary. A coupled hydrodynamic-erosion model is set up to simulate potential coversand ridge breach scenarios at different locations along the coversand ridges during flood events. Computed flow velocities and water depths from the hydrodynamic model were exported to an erosion model. This coupled modelling approach gives insight in the hydrodynamic conditions of different breaches during various floods. The first results imply that breaches in the coversand ridges located at the current location of the river IJssel are the most favourable for a breach to expand. This result gives insight in the landscape development of the Netherlands.
Original languageEnglish
Title of host publicationProceedings of the 1st IAHR Young Professionals Congress, 17-18 November 2020
EditorsJosé María Carrillo, Eva Fenrich, David Ferràs, Silke Wieprecht
PublisherIAHR
Pages32-33
Number of pages2
ISBN (Electronic)978-90-82484-6-63
Publication statusPublished - Nov 2020

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