Searched for: subject%3A%22bed%255C+protection%22
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Van den Bos, J.P. (author), Verhagen, H.J. (author), Olthof, J. (author)
The Paintal (1967) formula can be used to estimate transport rates of coarse-grained bed material (such as stones from a bed protection) under low hydraulic loads just above the threshold of motion; the application however is limited to steady currents. This paper presents research aimed at extending the range of application to a combination of...
conference paper 2010
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Hoan, N.T. (author)
Despite the fact that many studies on the stability of stones in bed protections under flowing water have been conducted, our knowledge is still far from advanced and reliable. Issues like how to quantify the hydraulic loads exerted on the stones on a bed and the associated stability of the stones are still central and most challenging in stone...
doctoral thesis 2008
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Hughes, S.A. (author)
A 1-to-25 scale physical model of a typical cross section of the levee along the Mississippi River Gulf Outlet (MRGO) was con-structed at the U.S. Army Engineer Research and Development Center’s Coastal and Hydraulics Laboratory in Vicksburg, MS. The purpose of the physical model was to obtain hydrodynamic measurements of unsteady flow...
report 2008
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Louwersheimer, W.F. (author), Verhagen, H.J. (author), Olthof, J. (author)
During the construction of the first Dutch offshore wind farm prototype measurements were performed. These measurements were aimed to monitor the behaviour of the granular filter layer of the scour protection around the mono-piles upon which the wind turbines are founded. These measurements were compared to scale model test results and...
conference paper 2007
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Hoan, N.T. (author), Booij, R. (author), Hofland, B. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)
The current research is aimed at finding a proper relation between flow forces acting on the bed and the bed response. To this end, experiments were carried out in which both the bed response (quantified by a dimensionless entrainment rate) and the flow field (velocity and turbulence intensity distributions) are measured. The three available...
conference paper 2007
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Hoan, N.T. (author), Booij, R. (author), Hofland, B. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)
The current research is aimed at finding a dimensionless stability parameter for non-uniform flow in which the effect of turbulence is incorporated. To this end, experiments were carried out in which both the bed response (quantified by a dimensionless entrainment rate) and the flow field (velocity and turbulence intensity distributions) are...
conference paper 2007
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Hofland, B. (author)
Layers of stone or rock are often applied around hydraulic structures to protect the sand bed from scouring. Determining the size of the rocks is complicated by the fact that the flow over a bed protection usually is non-uniform. This thesis describes two experimental series in which the stability of a single stone under non-uniform flows is...
doctoral thesis 2005
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Anonymous, A. (author)
HR Wallingford has commenced an engineering review on the Final Closure of Saemangeum Dike. This draft final report represents the completion of the second phase of studies by HR Wallingford and is issued for review by KARICO and discussion with their representatives during meetings planned in Ansan during the second week of October 2005. The...
report 2005
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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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Jongeling, T.H.G. (author), Jagers, H.R.A. (author), Blom, A. (author)
report 2003
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Hofland, B. (author)
report 2002
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Bosma, C. (author), Verhagen, H.J. (author), D'Angremond, K. (author), Sint Nicolaas, W. (author)
The paper describes the use of two fundamental design parameters, the void porosity and layer thickness in rock armour constructions. These design parameters are very sensible for factors such as the boundary definition of a rock layer, rock production properties, intrinsic properties and construction properties. Differences in the value of the...
conference paper 2002
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Van Gent, M.R.A. (author), Wallast, I. (author)
In river and coastal engineering bed protections and near-bed rubble mound structures are often used to protect other structures such as river groins, pipelines and intake- and outfall structures for power-stations and desalination plants. From river engineering relatively extensive information is available for bed protections with currents as...
report 2001
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Vrijling, J.K. (author), Ravenstijn, P. (author)
In many cases the bottom around a structure that is exposed to current has to be protected by a mattress. The purpose of the mattress is to protect the soil besides the structure from erosion and scour, thus preserving the strength of the foundation of the structure. Examples are the bottom protection around bridge piers, along guide bunds and...
report 2001
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Jongeling, T.H.G. (author), Verheij, H.J. (author), Wal, M. van der (author), Leeuwestein, W. (author)
report 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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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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Verheij, H.J. (author), Adel, H. den (author), Petit, H.A.H. (author)
report 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
document
Verheij, H.J. (author)
report 1999
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