Water Level Uncertainties Due to Uncertain Bedform Dynamics in the Dutch Rhine System

Matthijs Robert Alexander Gensen, Jord Jurriaan Warmink, Suzanne J.M.H. Hulscher

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Quantitative estimations of water level uncertainties are essential for the design and assessment of flood protection systems. This work aims to quantify the water level uncertainties in the bifurcating Dutch river Rhine system as a result of main channel roughness uncertainty. An one-dimensional hydraulic model of the Rhine branches is used to estimate the water levels in the system for several roughness scenarios. Model results show that the roughness effect has a large influence on the modelled water levels. However, for the larger Waal branch, the changing discharge distribution counteracts the roughness effect, thereby decreasing the range of possible water levels. For the smaller Nederrijn and IJssel branch it is possible that the discharge in the respective branch increases even though the branch has a high roughness. Thereby, for these branches the discharge distribution effect increases the range in modelled water levels. The large and varying effects on water levels by roughness uncertainty and changing discharge distributions in a bifurcating river system indicate the importance to consider the system as a whole instead of as separate branches in the design and assessment of river engineering works.
Original languageEnglish
Title of host publicationRecent Trends in Environmental Hydraulics
Subtitle of host publication38th International School of Hydraulics
EditorsMonika Kalinowska, Magdalena Mrokowska, Pawel Rowiński
ISBN (Print)978-3-030-37105-0
Publication statusPublished - 19 Feb 2020
EventXXXVIII International School of Hydraulics 2019 : Recent Trends in Environmental Hydraulic - Łąck, Poland
Duration: 21 May 201924 May 2019
Conference number: 38

Publication series

NameGeoPlanet: Earth and Planetary Sciences
ISSN (Print)2190-5193


ConferenceXXXVIII International School of Hydraulics 2019


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