Searched for: author%3A%22Hoffmans%2C+G.J.C.M.%22
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van Beek, V.M. (author), Hoffmans, G.J.C.M. (author)
The prediction of backward erosion piping is important for safety assessment of dikes in the Netherlands, where subsurface conditions are prone to this erosion mechanism. In the current assessment methodology, the adapted Sellmeijer rule is in use. In combination with the national safety philosophy and uncertainty in input parameters, this model...
conference paper 2017
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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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Hoffmans, G.J.C.M. (author)
doctoral thesis 1992
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Hoffmans, G.J.C.M. (author)
Het doel van het handboek ontgrondingen is een antwoord te geven op ontgrondingsvraagstukken zoals een ontwerper van waterbouwkundige constructies die tegenkomt. Verschillende deelstudies worden voor het afronden van dit handboek uitgevoerd. Het verifiëren van ontgrondingsformuies staat centraal in deze studies. Hier is de voorspellingskracht...
report 1995
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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 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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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), Den Adel, H. (author), Verheij, H.J. (author)
Scour is a natural phenomenon caused by the flow of water in rivers and streams and occurs as a part of the morphological changes caused by rivers or as a result of man-made structures. For the Dutch Delta Works hydraulic structures were often constructed on fines with loose packing. To guarantee the geotechnical stability of these structures...
report 2000
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Hoffmans, G.J.C.M. (author)
Het algemeen doel van het onderzoek lokale ontgronding is het numeriek modelleren van ontgrondingskuilen als functie van de tijd (twee dimensionaal vertikaal). Het model moet bij gegeven initiele stroomcondities en berekende materiaaleigenschappen de configuratie van de ontgrondingskuil na een bepaalde tijd simuleren. Hiertoe zijn twee modellen...
report 1987
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Laan, G.J. (author), Berendsen, E. (author), Hoffmans, G.J.C.M. (author)
"Structuur in eisen" is de aanduiding voor een methodische analyse van constructies ten aanzien van te vervullen eisen. In de analyse worden de relevante constructieve aspecten onderscheiden, benoemd en volgens een zekere systematiek met elkaar in verband gebracht. Hierbij worden eisen op diverse niveaus onderscheiden, randvoorwaarden en...
report 1996
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Hoffmans, G.J.C.M. (author)
Scour is a natural phenomenon caused by the flow of water in rivers and streams. Scour occurs naturally as part of the morphological changes of rivers and as result of structures man-made. Several types of scour can be distinghuished. Experience has shown that due to sand or flow slides or micro instabilities at the end of the bed protection,...
report 1993
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Hoffmans, G.J.C.M. (author)
Het doel van het handboek ontgrondingen is een antwoord te geven op ontgrondingsvraagstukken zoals een ontwerper van waterbouwkundige constructies die tegenkomt. Verschillende deelstudies worden voor het afronden van dit handboek uitgevoerd. Het verifiëren van ontgrondingsformules staat centraal in deze studies. Hier is de voorspellingskracht...
report 1995
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Hoffmans, G.J.C.M. (author)
In the Netherlands hydraulic engineering structures are not only designed, but are also managed and maintained (M&M). In the nineteen-nineties in the United States during periods of high water scores of bridges collapsed, because American law forbids the use of bed protection around bridge piers and moreover, no maintenance plans were available....
report 2006
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Hoffmans, G.J.C.M. (author)
Het handboek ontgrondingen beoogt een instrument te zijn om de grootte van lokale ontgrondingskuilen rondom brugpijlers, kribben, achter drempels met of zonder bodembescherming, uitlaatconstructies, strandmuren, strandhoofden, etc. te voorspellen. Met het handboek kunnen ontwerpers en adviseurs een eerste schatting van het ontgrondingsproces...
report 1994
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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)
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)
In the nineties, the stability of the Dutch river dykes along the Rhine could not be guaranteed. Hence many people were evacuated. None of the dykes failed and the damage was mainly restricted to the evacuations costs. Several recommendations were made to anticipate the treats of the near by future. Within this framework a prototype experiment...
report 2002
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Uittenbogaard, R.E. (author), Hoffmans, G.J.C.M. (author), Akkermans, R.J. (author)
report 1998
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Mosselman, E. (author), Akkerman, G.J. (author), Verheij, H.J. (author), Hoffmans, G.J.C.M. (author), Jongeling, T.H.G. (author), Petit, H.A.H. (author)
report 2000
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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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