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Janssen, M.P.J. (author)Although mangrove forests have proven to contribute to wave dissipation significantly, these ecosystem are threatened mainly by the expanding aquaculture. International or nationwide applied greenbelt policies are often used for the preservation of the mangroves and hence the flood hazard reduction, without taking local (hydrodynamic) conditions...master thesis 2016
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Janssen, T. (author)Fire Island has been monitored since Hurricane Sandy (2012). During that period, Fire Island showed recovery (accretion on the island). Behaviour of the recovery is not yet well-known. Main processes during the recovery are also not known. Therefore, the emphasis of this thesis is on the understanding of the main processes of the recovery of...master thesis 2016
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Janssen, M.P.J. (author), Koning, R.J. (author)Myanmar is dealing with a large data deficit, which is in contrast with the substantial need for it. The implementation of measuring techniques to obtain hydro- and morphodynamic data is an upcoming process. Measuring velocities can be valuable for calibrating models or giving estimates of sedimentation and erosion. An example of a measuring...student report 2016
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De Koning, R.J. (author), Janssen, M.P.J. (author)Large sedimentation is observed in the Yangon port area in Myanmar and this sediment is blocking the entrance channel into the port. The entrance channel is dredged intensively to keep it navigable but insight into the sedimentation processes is limited. The sedimented area rises above the water level in dry season and is known as the Inner Bar....student report 2016
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Smit, P.B. (author), Janssen, T.T. (author), Herbers, T.H.C. (author)Refractive focusing of swell waves can result in fast-scale variations in the wave statistics because of wave interference, which cannot be resolved by stochastic wave models based on the radiative transport equation. Quasi-coherent statistical theory does account for such statistical interferences and the associated wave inhomogeneities, but...journal article 2015
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Smit, P.B. (author), Janssen, T.T. (author)The interaction of ocean waves with variable currents and topography in coastal areas can result in inhomogeneous statistics because of coherent interferences, which affect wave-driven circulation and transport processes. Stochastic wave models, invariably based on some form of the radiative transfer equation (or action balance), do not account...journal article 2013
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- Van der Toorn, A. (author), Van der Wiel, W.D. (author), De Rooij, M. (author), Janssen, H. (author), Kiljan, D.J. (author) conference paper 2013
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Smit, P.B. (author), Janssen, T.T. (author), Herbers, T.H.C. (author)Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy...conference paper 2012
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Smit, P.B. (author), Janssen, T.T. (author), Herbers, T.H.C. (author)Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy...conference paper 2012
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Smit, P.B. (author), Janssen, T.T. (author)Wave fields traveling through a varying medium (e.g. topography, currents), can develop well-defined focal zones and caustics, where the wave field is highly coherent and wave statistics vary rapidly. However, the presence and evolution of such coherent structures in the wave field are not resolved in a quasi-homogeneous description of the wave...conference paper 2011
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Janssen, T.T. (author), Herbers, T.H.C. (author), Battjes, J.A. (author)We present a stochastic model for the evolution of random ocean surface waves in coastal waters with complex seafloor topography. First, we derive a deterministic coupled-mode model based on a forward scattering approximation of the nonlinear mild slope equation; this model describes the evolution of random, directionally spread waves over fully...journal article 2008
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Van Dongeren, A. (author), Battjes, J.A. (author), Janssen, T. (author), Van Noorloos, J. (author), Steenhauer, K. (author), Steenbergen, G. (author), Reniers, A. (author)The growth rate, shoreline reflection, and dissipation of low?frequency waves are investigated using data obtained from physical experiments in the Delft University of Technology research flume and by parameter variation using the numerical model Delft3D?SurfBeat. The growth rate of the shoaling incoming long wave varies with depth with an...journal article 2007
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Schokking, L.A. (author), Janssen, P.C. (author), Verhagen, H.J. (author)The stability of stones in propeller-induced jet wash is still difficult to predict. Especially the trend of bowthrusters increasing in size and power in sea going ships (especially ferries) over the last years may be a reason for concern when dealing with the protection of slopes and beds. But also ships used in inland navigation are using...journal article 2003
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Janssen, J.W.F.A. (author)De aanleiding voor dit afstudeerwerk was de constatering van Holland Railconsult dat hun begrotingen vaak lager waren dan het laagste bod bij een aanbesteding en dat zij vermoedden dat er een grotere marge rondom de begroting benodigd is om met een bepaalde betrouwbaarheid het laagste bod te vangen dan men in eerste instantie dacht. Men wilde...master thesis 2003
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Janssen, T.T. (author)This thesis studies the relation between short wave groups and long wave motion in the shore-normal case on a uniformly sloping bottom. The short wave groups can be described through two time scales; the time scale of the individual waves and the time scale of the groups. The energy of the individual waves is dissipated through wave breaking and...master thesis 1999
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Janssen, P.C. (author)Since 1992 nearshore hydrodynamics and coastal morphology have been studied from ARGUS video images, collected every hour at eight beach locations worldwide. Identification of the waterline from these images would enable us to obtain an impression of the intertidal beach bathymetry, and hence to monitor intertidal beach morphodynamics. In this...master thesis 1997
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Janssen, C.M. (author)Cross-shore sediment transport is an important phenomenon in coastal engineering, which mainly accounts for the short-term changes in the coastline. To study on- and offshore transport the evolution of the beach profile is considered. For investigation of the beach profile small-scale physical models are often used. A problem in using a physical...master thesis 1993
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Janssen, J.P.F.M. (author)A description is given of a model developed for the prediction of the dissipation of energy in random waves breaking on a beach. The dissipation rate per breaking wave is estimated from that in a bore of corresponding height, while the probability of occurrence of breaking waves is estimated on the basis of a wave height distribution with an...master thesis 1980
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Battjes, J.A. (author), Janssen, J.P.F.M. (author)A description is given of a model developed for the prediction of the dissipation of energy in random waves breaking on a beach. The dissipation rate per breaking wave is estimated from that in a bore of corresponding height, while the probability of occurrence of breaking waves is estimated on the basis of a wave height distribution with an...conference paper 1978