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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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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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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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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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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 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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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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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)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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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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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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Schiereck, G.J. (author)Flow (loads, stability, erosion) Porous flow (general, filters), waves (loads, stability, erosin), ships, protections, construction and maintenance, design.lecture notes 1996
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Schiereck, G.J. (author)Loads (flow, waves, ships, porous flow), Erosion (flow, remainder) Load reduction, stability (flow, waves, porous flow), Protections, construction and maintenance, design.lecture notes 1993
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- Stuip, J. (author) lecture notes 1980
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Derks, H. (author)Resultaten proeven met de Zinkcon mat in de stroomgoot in Lith op ware grootte.report 1972
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Hauer, M. (author), Van der Meulen, T. (author)Aan het begin van deze studie bestond onduidelijkheid over de vraag in hoeverre het eventueel falen van een geometrisch open filterconstructie in een open waterloop nu het gevolg zou zijn van onzekerheden met betrekking tot het bij het ontwerp gehanteerde rekenmodel, of juist van onzekerheden met betrekking t o t onnauwkeurigheden bij de bouw...report 1997