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Van den Bos, J. (author), Verhagen, H.J. (author), Zijlema, M. (author), Mellink, B. (author)A more detailed understanding of porous flow inside a rubble-mound structure may have potential benefits in breakwater design. Numerical models are expected to be a useful additional research tool in this field, provided that their calculation results can be validated against measurements. This paper presents the results of a systematic effort...conference paper 2014
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Tusinski, A. (author), Verhagen, H.J. (author)The objective of this research is to obtain generic relations between attenuated wave heights and various vegetation and topographical scenarios. Subsequently, it is aimed to find out what is the actual cost profit of a dike construction behind a mangrove zone comparing to the case when mangroves are absent. The graphs and formulas developed in...conference paper 2014
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Li, B. (author), Verhagen, A.A. (author), Teunissen, P.J.G. (author)Successful integer carrier-phase ambiguity resolution is crucial for high precision GNSS applications. It includes both integer estimation and evaluation. For integer estimation, the LAMBDA method has been applied in a wide variety of GNSS applications. The method’s popularity stems from its numerical efficien-cy and statistical optimality....conference paper 2013
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- Van Nes, A. (author), Lopez, M. (author), De Bonth, L. (author), Verhagen, D. (author), Waayer, S. (author) conference paper 2013
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Labrujere, A.L. (author), Verhagen, H.J. (author)When calculating the Carbon Footprint for a product or service, a direct link is made between the total amount of consumed energy and the produced amount of carbon dioxide during production. For that reason calculating the carbon footprint of various alternatives is a very straightforward method to compare energy consumption and more importantly...conference paper 2012
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Tri, M.C. (author), Cong, M.V. (author), Verhagen, H.J. (author), Nghia, N.K. (author)In the low-lying coastal regions coastal defense structures are usually designed with a main function to protect the hinterland from highly vulnerable of sea flooding. Sea dikes are usually the most common and important elements which form the coastal flood defense system. Sea dikes are designed at a pre-defined circumstance and requirement. For...conference paper 2012
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Van de Koppel, M.A. (author), Muilwijk, M. (author), Verhagen, H.J. (author)A physical model study on the row averaged static and dynamic load on the bottom row of single layer armour units in order to investigate the influence of various parameters such as the number of rows on the slope of a breakwater and the initial relative packing density.conference paper 2012
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Lioutas, A. (author), Smith, G.M. (author), Verhagen, H.J. (author)The scope of this research is to find an empirical formula to describe the distribution of wave overtopping in the region behind the crest. A physical model was set up in which irregular waves were generated. In order to find a formula which adequately describes the test observations, the influence of several parameters has been analysed. The...conference paper 2012
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Kik, R. (author), Van den Bos, J.P. (author), Maertens, J. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author)Different layer design of a rock slope and under layers has a large effect on the strengths on the rock slope itself. In the stability formula developed of VAN DER MEER [1988] this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate...conference paper 2012
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Chen, X. (author), Hassan, W. (author), Uijttewaal, W. (author), Verwaest, T. (author), Verhagen, H.J. (author), Suzuki, T. (author), Jonkman, S.N. (author)Wide crested dike can reduce the kinetic energy of the overtopping wave and make the overtopping wave to flow back to the seaside. If a coastal town were built on or near a dike, the overtopping wave running on the dike crest generates the force which can affect the buildings located in its path. However, quantifying the hydrodynamic load on the...conference paper 2012
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Mulders, P.H.M. (author), Verhagen, H.J. (author)A new series of physical model tests were conducted to analyse the behaviour of a breakwater core when it becomes exposed to wave attack. The emphasis of this research was on the measured influence of a wide stone grading on both the deformation of a breakwater trunk and the occurring longshore transport. This behaviour was investigated for both...conference paper 2012
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Dorst, K. (author), Provoost, Y. (author), Verhagen, H.J. (author)A revetment of pattern placed elements, or a so called pitching, is used worldwide to protect shorelines and embankments. Also in The Netherlands more than 500 km of river, lake and sea dikes is protected by pitchings. Until the 60’s the design and construction of pitchings was based on experience. After the first damages on pitchings and the...conference paper 2012
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Verhagen, H.J. (author)Apart from many ecological advantages, mangroves in front of a coastal defence may lower the construction and maintenance costs of the defence. Although mangroves have hardly any reducing effect on water levels (and on tsunami impact) mangroves may significantly reduce wave attack on a coastal dike, and in this way reduce the cost of a revetment...conference paper 2012
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Tuan, T.Q. (author), Verhagen, H.J. (author)Extensive laboratory experiments were carried out to investigate wave overtopping on seadikes with (vertical) crown-walls in Vietnam. It is shown that the wave overtopping reduction by walls is inadequately, although rather complexly, described by TAW-2002. A new approach has been developed, which can straightforwardly be incorporated in the...conference paper 2012
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Trung, L.H. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author), Cat, V.M. (author)The landware slopes of sea dikes in the north of Vietnam are steep and solely constructed by soil covered with grass due to the budget constraints and also the out-of-date design guidelines.The resistance against erosion due to wave overtopping of several grass covered slopes were tested with the Wave Overtopping Simulator to show if a slope...conference paper 2012
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Veerman, H. (author), Van Kleef, A. (author), Wokke, F. (author), Ober, O. (author), Tiberius, C.C.J.M. (author), Verhagen, A.A. (author), Bos, A. (author), Mieremet, A. (author)The paper presents a short introduction to the mathematical theory of the EVT, the consecutive steps that are made in the software tool to address MI probability estimation and proof of range error distribution overbounding. Finally some early results obtained by GIMAT are presented.conference paper 2012
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Tsimopoulou, V. (author), Kanning, W. (author), Voortman, H.G. (author), Verhagen, H.J. (author)One of the failure mechanisms of a rubble mound breakwater is the failure of its armour layer. In order to determine the stability of an armour layer, the design load has to be defined, which is in fact the wave that attacks the structure. Being a highly stochastic phenomenon, the wave action is not easily defined, while there is always some...conference paper 2011
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Verhagen, A.A. (author), Teunissen, P.J.G. (author), Van der Marel, H. (author), Li, B. (author)A key issue with GNSS carrier phase ambiguity resolution is that often the full set of ambiguities cannot be fixed fast and reliably. A possible strategy is then to resolve only a subset of ambiguities, one for which the probability of correct fixing, the so-called success rate, is sufficiently close to 1. However, a proper subset selection...conference paper 2011
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Burgmeijer, M.A. (author), Verhagen, H.J. (author), Van der Wegen, M. (author)Integrated Coastal Zone Management (ICZM) is an interdisciplinary process by definition. Individual actors in CZM need to cooperate and communicate to come to an optimum management strategy for the coastal zone. Because engineers focus on finding the “best” solution in engineering terms, they often are quite surprised that in the end of the day...conference paper 2011
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Trung, L.H. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author)The Simulator was applied to test the resistance against wave overtopping of grass covered dike slopes in Viet Nam. Observation and measurement during destructive tests were performed to investigate the development process of damage induced by overtopping flow. Damages were likely to be initiated at transition of either geometry or materials, at...conference paper 2011