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Van der Velden, E.T.J.M. (author)Het transport en de erosie van mengsels van zand met 10 tot 30% slib is onderzocht. Zowel het transport in de algemene zin als de erosie rond pijpleidingen is in beschouwing genomen. De transport karakteristieken van zand waar zich slib in bevindt verschillen van die van zuiver zand. De critische bodemschuifspanning neemt toe voor een toenemend...report 1993
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Hoffmans, G.J.C.M. (author)Scour is the lowering of the sea or river-bed as a result of non-equilibrium sediment transport conditions and can be divided into several categories (Breusers and Raudkivi, 1991). Local scour, which may occur at the base of a structure because of the affected flow pattern, can severely endanger the stability of this structure. Many varieties of...report 1993
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Hoffmans, G.J.C.M. (author), Booij, R. (author)Excessive local scour can progressively undermine the foundation of a structure. Because complete protection against scour is too expensive generally, the maximum scour-depth and the upstream slope of the scour hole have to be predicted to minimize the risk of failure. In 1961 a systematical research 'tY'ith respect to scour holes started in the...conference paper 1993
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- Meijer, D.G. (author), Hofmans, G.J.C.M. (author), Otta, A.K. (author) report 1992
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Franco, L. (author)Italy is often considered as a mother country of vertical breakwaters for harbour protection, since they have been widely used all along our coasts long since. An updated location map is given in fig. 1, which also shows the position of the directional wave recording stations of the existing Italian network. The most common vertical breakwaters...report 1992
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Kolkman, P.A. (author)Gecombineerde grafische voorstelling Moody/Shields voor de kritieke snelheid voor het begin van beweging van korrels, bepalende grootheden van evenwichtsdiepte en groei van ontgrondingskuilenreport 1992
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Mastbergen, D.R. (author)De proefresultaten van het experimentele onderzoek naar de ontgrondingskuilafmetingen bij persleidingbreuk, M1007, [3], alsmede een aantal praktijkgevallen zijn opnieuw geanalyseerd. Daartoe moesten een aantal grootheden opnieuw berekend worden uit de gearchiveerde meetgegevens. Er zijn een aantal dimensieloze parameters afgeleid, gebaseerd op...report 1991
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- Wal, M. van der (author), Driel, G. van (author), Verheij, H.J. (author) report 1991
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- Wal, M. van der (author) report 1991
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Herbich, J.B. (author)Review of knowledge regarding scour near pipelines and other offshore structures.report 1991
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Hoffmans, G.J.C.M. (author)Some information is given how to use the scour model DUCT-SUSTRA (Hoffmans, 1991). The scour model predicts the morphological process in scour holes or trenches and consists of two separated sub-models: a flow model DUCT and a morphological model SUSTRA. The flow model is based on the equation of continuity and the momentum equations for...report 1991
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Hoffmans, G.J.C.M. (author)Flume experiments with small Froude numbers have been carried out to study the concentration field in a local scour hole without supply of sediment load. The measuring results will be used to check the validity of the two dimensional scour model DUCT-SUSTRA. The objective of the experiments was to measure the concentrations at various locations...report 1990
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Jorissen, R.E. (author), Vrijling, J.K. (author)Downstream a hydraulic construction the original bed of a watercourse is usually protected against scour. This scour is caused by changes of the water movement due to the construction. Nevertheless scour occurs downstream this protection. The scouring process can be described by an empirical relation. The most important parameter of this...report 1989
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Steetzel, H.J. (author)In het kader van onderzoek naar de veiligheid van de Nederlandse kust is in opdracht van de Technische Adviescommissie voor de Waterkeringen een inventaristie gemaakt van de over ontgrondingskuilen beschikbare gegevens. Op basis van uitgevoerd modelonderzoek en beschikbare literatuur gegevens zijn enige conclusies getrokken omtrent de vorm en...report 1988
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Hoffmans, G.J.C.M. (author)A two dimensional mathematical model DUCT, which is based on a parabolic boundary layer technique, using finite elements, is proposed to predict the flow and turbulence field in complicated geometrical conditions, where recirculating flow may occur. Numerical results of the DUCT-model are compared with k-eps-predictions as well as laboratory...report 1988
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Hoffmans, G.J.C.M. (author)The general purpose of this research project is to model mathematically the scour-hole downstream of a structure (2-D). The model has to simulate the development of the scour as a function of time. Basically two models are necessary namely a flow model and a morphological model. The latter has to describe the bed- and suspended load and the...report 1988
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Tsujimoto, T. (author)Local scour is one of the most important causes on bridge failures during floods, and recent changes of river environments makes it difficult to predict the scour depth and design an appropriate protection works. In this study, firstly an analytical model to describe scouring process around a pier has been derived based on reasonable...report 1988
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Hoffmans, G.J.C.M. (author)The general purpose of this research project is to model mathematically the local scour downstream of a structure (2-D). The model has to simulate the development of the scour as a function of the time. Basically two models are necessary namely a flow model and a morphological model. The latter model has to describe the bed and suspended load...report 1988
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Hoffmans, G.J.C.M. (author)The general purpose of this research project is to model mathematically the local scour downstream of a structure (2-D). The model has to simulate the development of the scour as a function of the time. Basically two models are necessary namely a flow model and a morphological model. The latter model has to describe the bed and suspended load...report 1988
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- Driegen, J. (author) report 1987