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Verhagen, H.J. (author)In general the problem in education is that we teach nowadays students the knowledge from five years ago, to be applied in the next 5 to 15 years (I admit, the student of today will have reached his retirement when he will participate in the 50th ICCE, the title is exaggerating reality). When one analyses the developments in the profession, it...conference paper 1996
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Verhagen, H.J. (author)Introductory lecture on policy analysis and decision making, with a focus on decision makers in ports and harbours.conference paper 1998
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Verhagen, H.J. (author)Description of a simulation game to study and simulate decision making in a port and harbour environment with both social as well as environmental problems. The simulation game has been developed for a course for Black Sea port managers.conference paper 1998
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Verhagen, H.J. (author)Basic lecture on risk analysis for the design of coastal structures.conference paper 1998
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Verhagen, H.J. (author), Savov, B. (author)For the determination of the stability of coastlines, coastal erosion and the design of erosion protection studies, the “local” wave climate is the most important input parameter. For morphology, “local” means just outside the breaker line. On relatively calm days the local wave climate is strongly influenced by the effect of sea breeze. On the...conference paper 1999
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Verhagen, H.J. (author), De Vries, W.S. (author)Practical problems in the transfer of knowledge and skills to coastal engineers in training, with focus on the training of coastal engineers from developing countries and other countries in transition. The difference between the training of scientists and engineers.conference paper 1999
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Ye, S.Q. (author), Verhagen, H.J. (author)In order to develop a new philosophy of flood safety in terms of probability of a certain level, two mathematical models of breach growth in sandy dikes have become available to determine the flood discharge in case of dike failure. BREACHES 1.0, developed at Alkyon/Delft Hydraulics (Steetzel) and BRES 1.0 at Delft University of Technology ...conference paper 1999
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Verhagen, H.J. (author)Some twenty years ago WIS-dredging has been developed in the Netherlands. By injecting water into the mud layer, the water content of the mud becomes higher, it becomes fluid mud and will start to flow. The advantages of this system are that there is no need of transporting the mud in a hopper, and no need for a pipeline. Also from an energetic...conference paper 2000
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Verhagen, H.J. (author)For the determination of the stability of coastlines, coastal erosion and the design of erosion protection studies, the “local” wave climate is the most important input parameter. For morphology, “local” means just outside the breaker line. On relatively calm days the local wave climate is strongly influenced by the effect of sea breeze. On the...conference paper 2000
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Verhagen, H.J. (author)One of the major problems in the design of coastal structures is that the design has to be based on very uncertain input data. This implies that the degree of uncertainty is an important value for the designer. In traditional design the uncertainty is not really quantified, but an overall “safety factor” is included. The problem of this approach...conference paper 2000
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- Verhagen, H.J. (author) report 2001
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Verhagen, H.J. (author)Because of problems with the design guidelines produced by PIANC for armoured slopes under attack by bowthrusters, additional work has been done in the Netherlands. On the basis of this work computational rules have been developed. However, because of the increase of bowthruster power, more detailed knowledge is needed on the effect of a...conference paper 2001
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Van den Bosch, A. (author), D' Angremond, K. (author), Verhagen, H.J. (author), Olthof, J. (author)Studies on the stability of the amour layer (d’Angremond et. al. [1999] revealed the importance of density of placement. The current research focuses on the influence of the density of placement on the stability of cubes in a double armour layer and tetrapods and rocks in a single armour layer. The experiments were performed in the Laboratory of...conference paper 2002
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Verhagen, H.J. (author), D' Angremond, K. (author), Van der Vliet, K. (author)Recent research has shown that it is possible to use concrete cubes as a single armour layer on breakwaters. However, this is only possible in case a placing density of at least 70 % is achieved. In lab-tests it is no problem to place cubes with this density, however it is questionable if such a placing density can be achieved in prototype...conference paper 2002
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Verhagen, H.J. (author)On request of MarCom a questionnaire has been prepared to investigate the opinion of PIANC members and others about the quality and the usefulness of the MarCom working group reports. The results of this questionnaire were presented and discussed at the Sydney Conference (September 2002).conference paper 2002
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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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Verhagen, H.J. (author)In history PIANC has paid quite some attentions to breakwaters, in ancient years results of practical experience have been published in the country presentations at the Conferences, but later some of these papers started to have a more scientific basis. One of the first papers giving a good background on the processes of stability of breakwaters...conference paper 2002
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- Verhagen, F.Th. (author), Vermetten, A. (author) report 2002
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Verhagen, H.J. (author)Onderzoek naar kennisdissiminatie in de waterbouw en opzet van een kennisbank met toegang tot deze informatie. Uiteindelijk heeft dit project geresulteerd in www.kennisbank-waterbouw.nl.report 2002
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Verhagen, H.J. (author)In a classical design approach to breakwaters a design wave height is determined, and filled in into a design formula. Some undefined safety is added. In the method using partial safety coefficients (as developed by PIANC [1992] and recently also adopted by the Coastal Engineering Manual of the US Army Corps of Engineers [CEM [2003]) the degree...conference paper 2003