Searched for: department:"Hydraulic"
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Crum, S. (author), Van der Hoeven, M.L.E.B. (author), Krouwel, L.P.H.C. (author), Verhagen, H.J. (author)
Quantifying the penetration depth of a dragging anchor on a horizontal layer of rockfill provides the possibility to optimize the layer thickness of rockfill layers with a protective function. Current research on this subject is limited and is often aimed at anchor capacities in sand and clay. Penetration behaviour in rockfill is mainly...
conference paper 2015
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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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Van de Sande, S.A.H. (author), Uijttewaal, W.S.J. (author), Verheij, H.J. (author)
Granular filters are used for protection against scour and erosion of base material. For a proper functioning it is necessary that at the interfaces between the filter structure, the subsoil and the water flowing above the filter structure no material will be transported. Different types of granular filters can be distinguished, this paper...
conference paper 2014
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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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Verheij, H.J. (author), Hoffmans, G. (author), Dorst, K. (author), Van de Sande, S. (author)
Granular filters are used for protection of structures against scour and erosion. For a proper functioning it is necessary that the 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...
conference paper 2012
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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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Hoan, N.T. (author), Stive, M.J.F. (author), Booij, R. (author), Hofland, B. (author), Verhagen, H.J. (author)
This paper presents the results of an experimental study on stone stability under nonuniform turbulent flow, in particular expanding flow. Detailed measurements of both flow and turbulence and the bed stability are described. Than various manners of quantifying the hydraulic loads exerted on the stones on a bed are extensively reviewed and...
journal article 2011
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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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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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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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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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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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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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Bos, G. (author)
master thesis 1997
Searched for: department:"Hydraulic"
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