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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.

Subsite Publication open access journal

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.

Subsite Publication open access journal

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.

Subsite Publication open access journal

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.

Subsite Publication open access journal

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
Een nieuw ontwikkeld raamwerk om de veiligheid langs de vele kustlijnen over de hele wereld met ondiepe vooroevers (bijvoorbeeld kwelders en slikken) niet te overschatten. Rekening houden met de invloed van zeer lange golven, die vaak worden verwaarloosd in overstromingsrisicobeoordelingen, is belangrijk bij het berekenen van de kans dat golven de dijken overslaan.

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On the use of large-scale biodegradable artificial reefs for intertidal foreshore stabilisation

Marin-Diaz, B., Fivash, G.S., Nauta J., Temmink, R.J.M., Hijner N., Reijers V.C., Cruijsen, P.P.M.J.M., Didderen, K., Heusinkveld, J.H.T., Penning, E., Maldonado-Garcia, G., van Belzen, J., Christianen, M.J.A., van der Heide, T., Daphne van der Wal, D., Olff, H., Bouma, T. J. & Govers, L. L. - 01/11/2021 - All-Risk
A large-scale experiment was conducted on the tidal flats of the Dutch Wadden Sea, by installing biodegradable artificial reefs along 630 m. Waves, sediment dynamics and sediment properties around the structures were monitored over three years.

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On the use of large-scale biodegradable artificial reefs for intertidal foreshore stabilisation

Marin-Diaz, B., Fivash, G.S., Nauta J., Temmink, R.J.M., Hijner N., Reijers V.C., Cruijsen, P.P.M.J.M., Didderen, K., Heusinkveld, J.H.T., Penning, E., Maldonado-Garcia, G., van Belzen, J., Christianen, M.J.A., van der Heide, T., Daphne van der Wal, D., Olff, H., Bouma, T. J. & Govers, L. L. - 01/11/2021 - All-Risk
A large-scale experiment was conducted on the tidal flats of the Dutch Wadden Sea, by installing biodegradable artificial reefs along 630 m. Waves, sediment dynamics and sediment properties around the structures were monitored over three years.

Subsite Publication open access journal

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.

Subsite Publication upon journal access

Progression Rate of Backward Erosion Piping: Small Scale Experiments

Pol, J.C., van Klaveren, W., Kanning, W., van Beek, V.M., Robbins, B.A., and Jonkman, S.N. - 21/10/2021 - All-Risk
Series of experiments with detailed pipe flow measurements to better understand the piping erosion mechanism.

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