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Tomorrow’s Rivers

Niesten et al. - 2024 - Publications
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Initiating and upscaling mussel reef establishment with life cycle informed restoration: Successes and future challenges

Temmink, R.J.M., Fivash, G.S., Govers, L. L., Nauta J., Marin-Diaz, B., Cruijsen, P.P.M.J.M., Reijers V.C., Didderen, K., Penning, E., Olff, H., Heusinkveld, J.H.T., Lamers L.P.M., Lengkeek, W., Christianen, M.J.A., Bouma, T. J. & van der Heide, T., - 25/11/2021 - All-Risk
Life cycle informed restoration enhances mussel bed formation. However, mussel biomass depends on sediment burial. Larger-scale processes resulted in partial burial of the structures. Therefore, optimisation of the structures is required to overcome technical failure at exposed sites.

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Numerical investigation of the effects of roughness, a berm and oblique waves on wave overtopping processes at dikes

Chen, W., Warmink, J. J., van Gent, M. R. A., & Hulscher, S. J. M. H. - 24/11/2021 - All-Risk
Introducing a roughness factor to existing empirical formulas leads to better estimates of the flow charac-teristics. We found that the flow characteristics are more sensitive to the variation of the berm width than to the berm level. In order to take oblique waves into account, the 2D numerical model is extended into the 3D model domain. The numerical model computa-tions confirm that the reductive influence factor of oblique waves is dependant on the berm width.

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Numerical investigation of the effects of roughness, a berm and oblique waves on wave overtopping processes at dikes

Chen, W., Warmink, J. J., van Gent, M. R. A., & Hulscher, S. J. M. H. - 24/11/2021 - All-Risk
Introducing a roughness factor to existing empirical formulas leads to better estimates of the flow charac-teristics. We found that the flow characteristics are more sensitive to the variation of the berm width than to the berm level. In order to take oblique waves into account, the 2D numerical model is extended into the 3D model domain. The numerical model computa-tions confirm that the reductive influence factor of oblique waves is dependant on the berm width.

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River Response to Anthropogenic Modification: Channel Steepening and Gravel Front Fading in an Incising River

19/11/2021 - Rivers2Morrow

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River Response to Anthropogenic Modification: Channel Steepening and Gravel Front Fading in an Incising River

19/11/2021 - Rivers2Morrow

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Accuracy of visual inspection of flood defences

W. J. Klerk, W. Kanning, M. Kok, J. Bronsveld & A. R. M. Wolfert - 17/11/2021 - All-Risk
Insights into whether and how we can improve visual inspections, and starting points where other techniques such as drones can be of added value.

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Accuracy of visual inspection of flood defences

W. J. Klerk, W. Kanning, M. Kok, J. Bronsveld & A. R. M. Wolfert - 17/11/2021 - All-Risk
Inzicht of en hoe we visuele inspecties kunnen verbeteren, en aanknopingspunten waar andere technieken zoals drones van meerwaarde kunnen zijn.

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The wave overtopping load on landward slopes of grass-covered flood defences: Deriving practical formulations using a numerical model

van Bergeijk, V.M.; Warmink, J.J.; Hulscher, S.J.M.H. - 11/11/2021 - All-Risk
Flow separation at the landward crest line occurs for steep slopes resulting in high impact forces by the overtopping wave at the reattachment location and the landward toe. We were able to capture both process accurately and used the model outputs to calculate erosion indices that show when and where erosion of the grass cover is expected.

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The wave overtopping load on landward slopes of grass-covered flood defences: Deriving practical formulations using a numerical model

van Bergeijk, V.M.; Warmink, J.J.; Hulscher, S.J.M.H. - 11/11/2021 - All-Risk
De belasting inclusief loslating en impact is gemodelleerd voor een individuele overslaande golf in OpenFOAM. Voor een steil binnentalud laat de golf los bij de kruinlijn wat leidt tot een hoge belasting op het boventalud. Nieuwe praktische formules zijn afgeleid voor de maximale snelheid, druk, normaalspanning en schuifspanning. Deze formules zijn gebruikt om verschillende erosie indexen te berekenen die laten zien waar en wanneer erosie van de grasmat verwacht wordt.

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The Influence of Infragravity Waves on the Safety of Coastal Defences: A Case Study of the Dutch Wadden Sea

Lashley, C. H., Jonkman, S. N., Van der Meer, J., Bricker, J. D., and Vuik, V - 01/11/2021 - All-Risk
A newly developed framework not to overestimate safety along the many coastlines around the world that have shallow foreshores (e.g. saltmarshes and mudflats). Considering the influence of very long waves, which are often neglected in flood risk assessments is important when calculating the likelihood of waves overtopping the dikes.

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