Searched for: subject:"bed%5C+protection"
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van Oorschot, Harm (author)
On the 29th of December 2016 a large Rhine ship loaded with 2000 ton benzene sailed through the weir at Grave, located in the river Meuse in the Netherlands. The accident created a large gap in the weir and within 12 hours the upstream water level decreased by a maximum of 3 meters. Due to this decreased water level shipping was limited,...
master thesis 2018
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Rubaij Bouman, Roland (author)
The formation of scour holes is a vital thread of retaining the water infrastructure of rivers. Nowadays, protective filters are used to prevent washing away of the underlying material. Rijkswaterstaat started the program 'Stroomlijn’, in which trees (logs) are cut from the floodplains and placed in a sheltered zone of the river to test whether...
master thesis 2018
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van Saase, Mark (author)
Zeeland, located in the south west of The Netherlands, has suffered major casualties and damage due to the flood in 1953. After the disaster, the Dutch Government appointed the so-called Deltacomittee, provided with the task of advising on the execution of the Deltaplan. As part of the Deltaplan, North Sea estuaries has been closed off from the...
master thesis 2018
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Tian, Ye (author)
Downstream of hydraulic structures, the flow is normally of turbulence. This will cause considerable erosions on the gravel bed. To prevent this, block mattress is preferable in many cases. Its effective stabilization and feasibility on construction make it commonly used against scouring problems, protecting underwater pipelines and cables. The...
master thesis 2017
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Koote, Melvin (author)
Erosion and sedimentation are natural processes that occur in natural flows.
If the erosion is a threat for a structure, a bed protection is necessary to stop this process. A bed protection usually consists of relatively large stones.
For calculating the required dimeter of the stones several formulae are available, of which the formula...
master thesis 2017
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Arrieta Ortubay, Xabi (author)
Block mattresses are widely used bed protection elements under non-uniform flows. Previous studies show that the turbulence of the flow plays a key role on the instability of the mattress. However, in the available design equations, the turbulence intensity is included as a magnification factor roughly and qualitatively defined. Consequently,...
master thesis 2017
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Hollander, W. (author)
A filter can be applied to protect a bed against scour. Normally, these filters are geometrically closed, to prevent winnowing of the base material through the filter. However, geometrically closed filters are expensive and difficult to realize in the field. Geometrically open filters can serve as an alternative. Within an open filter, the pores...
master thesis 2015
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Steenstra, R.S. (author)
For the design of granular bed protections often a stability parameter is used. The stability parameter represents the forces that are acting on the stones and is used to predict the response of the bed to these forces. Existing parameters are often derived for a limited range of application. When the parameter is used outside this range, the...
master thesis 2014
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Roelse, F.P. (author)
In the last decades shipping has increased significantly, resulting in larger ships with an increasing power in bow thrusters. Due to this increasing power, the hydraulic loads at bottom protection near quay structures has also increased, making a traditional bed protection more expensive. Therefore an alternative design method is suggested in...
master thesis 2014
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Van den Brink, A.J.W. (author)
Introduction Inland and seagoing vessels are equipped with (bow) thrusters. The use of these thrusters can cause scour of the bed alongside a quay wall. In order to assess the consequences of local scour due to bow thrusters on the design of the structure it is desirable to know the dimensions of the scour holes as a function of in time....
master thesis 2014
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Van de Sande, S.A.H. (author)
Granular filters are used for protection against scour and erosion. For a proper functioning it is necessary that interfaces between the filter structure, the subsoil and the water flowing above the filter structure are stable. Stability means that there is no transport of subsoil material through the filter to the water above the filter, and...
master thesis 2012
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Van Doorn, R. (author)
Research into hydraulic loads by a bow thruster. The hydraulic loads on the slope at an open quay construction on piles is investigated. The propeller (bow thruster) jet induces hydraulic loads on the bed, which could result in scour holes and damage to the quay construction. Performed scale model tests provide details about the hydraulic loads...
master thesis 2012
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Veenstra, E.G. (author)
An ever-increasing number of cables and pipelines are being laid on the bottom of lakes, channels, rivers, seas, and oceans. Various hazards threaten these pipelines and cables, which in case of occurrence can cause (severe) environmental and/or economic damage. Pipelines and cables can be protected against these attacks by dumping protective...
master thesis 2005
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Bijman, W.B.G. (author)
Een belangrijk aspect bij het bepalen van de resulterende schuifspanning is de niet-lineaire interactie tussen golven en stroming. De grenslagen van de golven en de stroming beinvloeden elkaar wederzijds, waardoor de gemiddelde schuifspanning en de maximale schuifspanning voor de combinatie van golven en stroming groter zijn dan kan worden...
master thesis 2000
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Jansens, R. (author)
Filterconstructies hebben als doel constructies te beschermen tegen uitspoeling van grond en beschadiging door wateroverdrukken. Een granulaire filterconstructie bestaat uit een ofmeer lagen van granulairfiltermateriaal, die het onderliggende, loskorrelige basismateriaal tegenhoudt, maar het water doorlaat. Meestal wordt het criterium gehanteerd...
master thesis 2000
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Hamerslag, E.J.F. (author)
Dit rapport beschrijft een onderzoek naar de bodembescherming die voor een verticale golfbreker aangebracht wordt. Voor een verticale golfbreker ontstaat een staande golf waarin orbitaalstromingen wrijving op de bodem veroorzaken. Het ontbreken van een bodembescherming kan leiden tot het ondergraven van een verticale golfbreker. Om inzicht te...
master thesis 2000
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De Boer, G.M. (author)
Experimental research on the stability of bed protection and transport of stones on such a bottom protection. Investigated were the effects of duration and magnitude of the load, the shape, and placing density of the stones.
master thesis 1998
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Weustink, O.W.A. (author)
Laboratory research on the distribution of stones during the dumping process from a side stone dumping vessel. Focus on the variation in the height of the toplayer of the bed protection (degree of leveling). Research in cooperation with Royal Boskalis Westminster.
master thesis 1998
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Boutovski, A. (author)
Experimental research on the stability of dumped stones for bed protections with focus on the gradation of the stones. A bottom protection has more roughness than anticipated. The Shields criterion is still applicable (psi=0.03)
master thesis 1998
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Van Bree, B. (author)
Momenteel wordt onderzocht of het technisch haalbaar is de Golf van Khambhat, een zee-arm in het noordwesten van India, af te sluiten. Bij de afsluiting van dit estuarium treden, door het enorme reservoiroppervlak en het grote getijverschil, enorm hoge stroomsnelheden op. Uit deze haalbaarheidsstudie kwam de meer algemene vraag naar voren of het...
master thesis 1997
Searched for: subject:"bed%5C+protection"
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