document

Risk-based asset management of a navigation network

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

document

Energy loss and set-up due to breaking random waves

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

document

Topography-induced focusing of random waves

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

document

Coherent interference and diffraction in random waves

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

document

Topography-induced focusing of random waves

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

document

Deliberate deformation of concrete after casting

Grünewald, S. (author), Janssen, B. (author), Schipper, H.R. (author), Vollers, K.J. (author), Walraven, J.C. (author)

This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place...

conference paper 2012

document

Manufacturing double-curved elements in precast concrete using a flexible mould: First experimental results

Schipper, H.R. (author), Janssen, B. (author)

The manufacturing of double-curved precast concrete elements is still expensive, due to the high costs and limited possibilities for repetitive use of the moulds or formwork. The goal of the research described in this paper is to develop a production method that overcomes these difficulties by enabling the mould to be reused many times and by...

conference paper 2011

document

Curving Concrete: A Method for Manufacturing Double Curved Precast Concrete Panels using a Flexible Mould

Schipper, H.R. (author), Janssen, B. (author)

Free form architecture with complex geometry brings along new challenges for manufacturers of building components. This paper describes the application of structural mechanics to predict the behaviour of an elastic mould surface, used as formwork for the manufacturing of double curved panels in precast concrete. Results are presented of...

conference paper 2011

document

Deliberate deformation of concrete after casting

Grunewald, S. (author), Janssen, B. (author), Schipper, H.R. (author), Vollers, K.J. (author), Walraven, J.C. (author)

This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place...

conference paper 2012

document

Nonlinear surface waves over topography

Janssen, T.T. (author)

As ocean surface waves radiate into shallow coastal areas and onto beaches, their lengths shorten, wave heights increase, and the wave shape transforms from nearsinusoidal to the characteristic saw-tooth shapes at the onset of breaking; in the ensuing breaking process the wave energy is cascaded to small-scale turbulent motions in the surf zone....

doctoral thesis 2006

document

The applicability of the SUR measurement for ultrafiltration of WWTP effluent

Janssen, A.N. (author)

doctoral thesis 2011

document

Characterisation of oil-water mixtures produced in high-watercut oil wells, Karakterisering van olie-water mengsels geproduceerd in olieputten met een hoog watergehalte

Janssen, P.H. (author)

doctoral thesis 2000

document

Reactions of nitrogen oxides in power-plant plumes: Models and measurements

Janssen, L.H.J.M. (author)

doctoral thesis 1988

document

The Evolution of Inhomogeneous Wave Statistics through a Variable Medium

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

document

Generalized evolution equations for nonlinear surface gravity waves over two-dimensional topography

Janssen, T.T. (author), Herbers, T.H.C. (author), Battjes, J.A. (author)

journal article 2006

document

De toepasbaarheid van de SUR-meting voor ultrafiltratie van rwzi-effluent

Janssen, A.N. (author), van der Graaf, J. (author)

journal article 2012

document

Testing regulations and procedures for environmental auditing of recycled aggregates

Hendriks, Ch.F. (author), Janssen, G.M.T. (author)

journal article 2001

document

Application of construction and demolition waste

Hendriks, Ch.F. (author), Janssen, G.M.T. (author)

journal article 2001

document

Construction and demolition waste: General process aspects

Hendriks, Ch.F. (author), Janssen, G.M.T. (author)

journal article 2001

document

Evolution of ocean wave statistics in shallow water: Refraction and diffraction over seafloor topography

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