Searched for: subject%3A%22groynes%22
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Brouwers, Steven (author)
Due to river training in the past centuries, the bed level of the Waal started and is still decreasing by several centimetres a year. Erosion of the riverbed causes problems for objects underneath the riverbed like cables, pipelines and foundations of structures. Furthermore, some parts of the river are eroding at a higher velocity compared to...
master thesis 2022
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Grosfeld, Jakob (author)
Plastic pollution and accumulation in the riverine environment is of increasing concern. While most research focuses on microplastic contamination, the dynamics of macrolitter remain largely unknown. Large scale riverbank monitoring initiatives in the Netherlands reveal that macrolitter hotspots occur at several locations. Unfortunately, current...
master thesis 2022
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van Alderwegen, E. (author), Mosselman, E. (author), Zijlema, A. (author), Bahrami-Yarahmadi, M. (author), Reedijk, B (author)
conference paper 2022
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Ahrendt, S.M. (author), Blom, A. (author), van Denderen, R. Pepijn (author), Schielen, R.M.J. (author), Horner-Devine, Alexander (author)
conference paper 2022
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Alahmady, Gamal (author), Crosato, A. (author), Werner, Micha (author)
conference paper 2022
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van Alderwegen, Earvin (author)
Large-scale measures within the river programmes such as Room for the River, Natura2000 and Water Framework Directive have increased the biodiversity in Dutch rivers and have achieved a more natural landscape. However, recent river programmes have shown conflicts between safety against flooding and riverine nature rehabilitation with maintaining...
master thesis 2021
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Zhou, Z. (author)
Estuaries are partially enclosed water bodies where river water mixes with sea water. Estuaries provide important ecological functions which are strongly regulated by estuarine hydrodynamics and sediment dynamics, and also by human interventions. Sustainable management of such systems therefore requires a thorough understanding of the interplay...
doctoral thesis 2021
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Harms, Johan (author)
Currently multiple projects investigate the effect of lowering the crest of groynes in the Dutch rivers with the aim to lower the backwater effect of groynes under high water levels. There is a major uncertainty however in the modelling of groynes, and therefore in the prediction of the effect of groyne lowering. Currently submerged groynes are...
master thesis 2021
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Overgaauw, Tim (author)
While waves are propagating towards the shore and are interrupted by an obstacle like a groyne, they will turn around the tip into the sheltered region of the groyne. This sheltered region is called the shadow zone and contains a reduced wave climate. The turning of the waves is based on the lateral transfer of wave energy along the wave crest,...
master thesis 2021
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Pasman, R. (author), Schielen, R.M.J. (author), Bricker, J.D. (author), van der Hout, A.J. (author), Mosselman, E. (author), Uijttewaal, W.S.J. (author), Collas, Frank (author), Huthoff, Freek (author)
abstract 2021
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Memar, S. (author), Morales Napoles, O. (author), Hofland, B. (author), Melling, Gregor (author)
During the last two decades, increasing vessel size in major German estuaries has led to the significant change of the local loading regime i.e. increased importance of ship-induced waves and currents. As a consequence, the intensity of ship-induced loads has increased considerably, resulting in damage to rock structures such as revetments,...
conference paper 2021
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Zhou, Z. (author), Ge, Jianzhong (author), van Maren, D.S. (author), Wang, Zhengbing (author), Kuai, Y. (author), Ding, Pingxing (author)
Lateral flows redistribute sediment and influence the morphodynamics of channel-shoal systems. However, our understanding of lateral transport of suspended sediment during high and low water slack is still fairly limited, especially in engineered estuaries. Human interventions such as dike-groyne structures influence lateral exchange...
journal article 2021
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Kok, Emma (author)
In the Waal bed degradation occurs, which is mainly induced by a large number of river regulations measures done in the past. Rijkswaterstaat develops possible measures and new techniques to stop riverbed erosion and/or mitigate the negative effects. One of the possible new techniques to reduce riverbed erosion locally is groyne field...
master thesis 2020
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Pasman, R. (author)
Ships in rivers create waves and these can have a negative impact on fish habitats along the river banks. A modelling study is carried out to investigate how these ship-induced waves can be damped in groyne fields by making structural modifications to the groynes. For this purpose, different types of openings (notches) are applied to the groynes...
master thesis 2020
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Zhang, R. (author)
Beach erosion, the loss of sand from a beach due to longshore and/or cross-shore sediment transport mechanisms, is a challenging problem. In order to stabilize the beach and to slow down the rate of beach erosion, the construction of hard hydraulic structures is a traditional option. Groins are one of the oldest man-made hydraulic structures...
doctoral thesis 2020
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Le, T.B. (author), Crosato, A. (author), Montes Arboleda, A. (author)
The Dutch River Waal, a branch of the Rhine, has been trained for centuries to mitigate the effects of ice-jams and improve navigation. The works, started in 1850, involved river straightening and narrowing by a series of transverse groynes. Besides fulfilling their goal, the groynes also created the need to raise flood protection works and...
journal article 2020
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Ambagts, Lindert (author)
In submerged conditions groynes add resistance to a river, thereby increasing the water levels for a particular discharge. Groynes are modelled in two ways, either they are included in the bed topography when the grid resolution is sufficiently high or with a sub-grid parametrisation when the grid cell-size is larger than the geometry of the...
master thesis 2019
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Chit Yan Toe, Chit (author)
In this research two problem statements are defined, namely (1) the validity of the assumption that groynes and weirs are equivalent in hydraulic models, and (2) the difficulty of modelling groynes and weirs in the 3D numerical solver package OpenFOAM. Using the incompressible 3D Navier-Stokes equations solver for multiphase phase flows, the so...
master thesis 2018
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Platzek, F.W. (author)
A river engineer is challenged with the task of setting up an appropriate model for a certain application. The model needs to provide suitable answers to the questions asked (i.e. be effective) and needs to do this within the available time (i.e. be efficient). To set up such a model with sufficient accuracy and certainty, a modeller needs to...
doctoral thesis 2017
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Briele, A.C. (author)
Permeable wooden pile groins have a long tradition as being part of the coastal protection in the Netherlands, as well as in Germany and the United Kingdom. They are built to protect beaches from eroding by reducing the current velocity along the beach and thus its ability to transport beach material. This type of groin is most popular among the...
master thesis 2014
Searched for: subject%3A%22groynes%22
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