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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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Verhagen, H.J. (author)This chapter discusses the design aspects of estuary and river closures and those of reservoir dams and certain other hydraulic structures. The focus of this chapter is on closures, not on the situation after the closure has been completed.book chapter 2007
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Roubos, A. (author), Verhagen, H.J. (author)Design formulas for bed protections in the port of Rotterdam were investigated. Using depthsoundings, the actual level of stability of a quay wall can be compared with the design formulas. The loads on a bottom protection differ, because of diversity in shipping and tidal motion. Therefore a better comparison can be made by resembling the...conference paper 2007
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Lam, N.T. (author), Stive, M.J.F. (author), Verhagen, H.J. (author), Wang, Z.B. (author)Morphodynamics of a tidal inlet system on a micro-tidal coast in a tropical monsoon influenced region is modelled and discussed. Influences of river flow and wave climate on the inlet morphology are investigated with the aid of process-based state-of-the-art numerical models. Seasonal and episodic behaviour of the inlet system under the...conference paper 2007
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Lam, N.T. (author), Stive, M.J.F. (author), Verhagen, H.J. (author), Wang, Z.B. (author)The influence of river flood on the coastal inlet morphology is investigated with the aid of process based state-of-the-art numerical models. Hydrodynamics of tidal inlets during a severe flood situation and behavior of the inlets are described and explained.conference paper 2007
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Tuan, T.Q. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)Under effects of tropical cyclones, the coast is subjected to attack both by surge and wave from the sea and by flooding from the bay. These forces pose a serious breaching threat to natural sea-defence works such as barrier spits, barrier islands, lagoon barriers, etc. on the coast. Unintended breaching can be catastrophic, causing losses of...conference paper 2006
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Lam, T.N. (author), Stive, M.J. (author), Verhagen, H.J. (author), Wang, Z.B. (author)Thuan An is a tidal inlet located in Vietnam in a tropical monsoon area. The inlet is very dynamic and variable under the influences of not only tides and waves from the sea but also flows and floods from upstream rivers. Therefore, morphodynamic behaviour of the inlet is very complicated and not well understood. Studies on inlet are also facing...conference paper 2006
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Meetresultaten extra proef Kunststof GC-elementen: Stabiliteit, soortelijk gewicht en elasticiteitVerhagen, H.J. (author), De Gijt, J.G. (author), Boskma, L. (author)Dit rapport is een aanvulling op het eindverslag van het onderzoek naar het gedrag van kunststof GC elementen voor oever- en bodembescherming. Conclusies van dat (schaal-) onderzoek waren dat een structuur van GC elementen verrassend sterke hydraulische eigenschappen bezit en daarmee interessant is als erosiebeschermer bij bodem en...report 2006
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Tuan, T.Q. (author), Verhagen, H.J. (author), Visser, P.J. (author), Stive, M.J.F. (author)To increase physical insight into wave overwash processes at low-crested beach barriers, wave overtopping discharge events rather than the conventional average overtopping discharge need to be quantified. Also, in order to make intelligent use of the many empirical formulations on wave overtopping discharge at breakwaters from literature, a...journal article 2006
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Verhagen, H.J. (author), Van der Hoeven, T. (author), Maaskant, B. (author), Schoenmakers, N. (author), De Gijt, J. (author), Boskma, L. (author)Anome BV en het Innovatie Test Centrum van Rijkswaterstaat-DWW zijn samen met verschillende partners aan het onderzoeken in hoeverre Ground Consolidators (GCs) interessant zouden kunnen zijn voor gebruik in Oever- en bodembescherming. De eerste fase van het onderzoek is afgerond en er is besloten om verdergaand onderzoek te doen. In verband met...report 2006
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Verhagen, H.J. (author), Van der Hoeven, T. (author), Maaskant, B. (author), Schoenmakers, N. (author), De Gijt, J. (author), Boskma, L. (author)Anome BV en het Innovatie Test Centrum van Rijkswaterstaat-DWW zijn samen met verschillende partners aan het onderzoeken in hoeverre Ground Consilidators (GCs) interessant zouden kunnen zijn voor gebruik in Oever- en bodembescherming. De eerste fase van het onderzoek is afgerond en er is besloten om verdergaand onderzoek te doen. In verband met...report 2006
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Verhagen, H.J. (author), Reedijk, B. (author), Muttray, M. (author)Experience has shown that stability parameters for breakwater armour are different for steep and shallow foreshores, as well as for deep and shallow water. A change from a deep water spectral information (Tm0) to shallow water spectral information (Tm-1,0) does not completely explains this difference. Tests have shown that stability also depends...conference paper 2006
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Van Oosten, R.P. (author), Peixó Marco, J. (author), Van der Meer, J.W. (author), Van Gent, M. (author), Verhagen, H.J. (author)The European Union funded project DELOS was focused on wave transmission and an extensive database on low-crested rubble mound structures was generated. During DELOS, new empirical wave transmission formulae were derived. These formulae still showed a considerable scatter due to a limited number of parameters included. Neural networks based on a...conference paper 2006
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Tuan, T.Q. (author), Verhagen, H.J. (author), Visser, P.J. (author)A hydrodynamic numerical model is formulated to describe the breach erosion process of sandy barriers. The breach flow is based on the system of unsteady shallow water equations, which is solved using a robust upwind numerical approach in conjunction with the Finite Volume Method (FVM). The hydraulic jump is considered as part of the breach flow...conference paper 2006
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Tuan, T.Q. (author), Verhagen, H.J. (author), Visser, P.J. (author), Stive, M. (author)For management of coastal breaching hazards it is critical to be able to assess the potential of coastal barrier breaching as a result of wave actions during storm surges (wave overwash). This phenomenon is known as the breach initiation phase; the mechanisms behind this are not very well understood. In the present study, laboratory experiments...conference paper 2006
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Terrile, E. (author), Reniers, A.J.H.M. (author), Stive, M.J.F. (author), Tromp, M. (author), Verhagen, H.J. (author)Incipient motion of coarse particles under regular shoaling waves is examined. Experiments are performed to investigate the effects of bed fluid acceleration on coarse particle stability. By varying wave height, wave period and water depth, combinations of similar peak orbital velocities and weak to strong intra-wave accelerations were created....journal article 2005
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De Gijt, J. (author), Blokland, T. (author), Verhagen, H.J. (author), Boskma, L. (author)Het innovatie Test Centrum (ITC) van de Dienst Weg en Waterbouw van Rijkswaterstaat en Anome BV hebben een samenwerkingsovereenkomst gesloten om te onderzoeken in hoeverre Ground Consolidators interessant zouden kunnen zijn voor gebruik in Oeveren bodembescherming. Binnen deze overeenkomst is geregeld dat het ITC de helft van de onderzoekskosten...report 2005
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Verhagen, H.J. (author)In case of coasts with steep foreshores coastal structures suffer more from damage than normally could be expected from given boundary conditions at deep water. For that reason in many guidelines it is recommended to apply a heavier class of rock in those cases; manufacturers of single layer units (like Accropode, Core-loc or Xbloc) recommend a...conference paper 2005
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Verhagen, H.J. (author), De Gijt, J.G. (author), Hoebe, J. (author), Boskma, L. (author)Om in een quick scan een idee te krijgen inzake de werking van de Anome Ground Consolidator zijn een aantal simpele proeven in een goot van de Faculteit CiTG van de TU Delft uitgevoerd. Er zijn testen gedaan op een vlakke bodem (A) en op een talud (B), als schaalmodel, in de stromings/ golfgoot aan de TU Delft, afd. Hydraulic Engineering. Bij A...report 2005
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Stive, M.J.F. (author), Terrile, E. (author), Reniers, A.J.H.M. (author), Verhagen, H.J. (author)Threshold of motion of coarse particles under regular shoaling waves is studied. Experiments were performed to investigate the effects of bed fluid acceleration on coarse particle stability. By varying wave height, wave period and water depth combinations of similar peak orbital velocities and weak to strong intra-wave accelerations were created...conference paper 2005