Searched for: subject%3A%22cohesive%255C+sediment%22
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Dankers, P.J.T. (author)
Highly concentrated suspensions are present in many natural environments. When the concentration becomes large enough, particles start to interfere with each other and their settling velocity reduces. This is called hindered settling. As a result of the reduced settling velocity, particles remain in the water column for a longer time and the...
doctoral thesis 2006
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Wang, L. (author)
In the Dutch coastal zone, where the marine environment is highly dynamic owing to tidal currents, wind-driven, wave-driven, and density-driven currents and waves, the cohesive sediment dynamics is always a great concern to transportation authority and coastal managers. So far, a lot research has been contributed on the cohesive sediment...
report 2006
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Qinghua, Y. (author)
In the Dutch coastal zone, where the marine environment is characterized by shallow depths and highly energetic hydrodynamic conditions, the cohesive sediments, or mud, play an important role in the local morphology. For instance, mud deposits and high concentrations of suspended particulate matter (SPM) occur frequently, especially during...
report 2006
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Maggi, F. (author)
Cohesive sediment suspended in natural waters is subject not only to transport and deposition processes but also to reactions of flocculation, \textit{i.e.} aggregation of fine particles, and breakup of aggregates. Although aggregation and breakup occur at small and very small length scales compared to transport and deposition, flocculation can...
doctoral thesis 2005
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Maggi, F. (author)
The study of cluster format ion is common in many fields of science and technology (aerosols, colloidal suspensions, hetero-disperse particulate systems in general, growth processes far from equilibrium, etc.). The term "cluster" is a general word indicating an object consisting of a set of elementary unit es organised with a certain structure....
report 2003
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Merckelbach, L.M. (author)
Many harbours in the world suffer from high siltation rates in their basins. To guarantee safe shipping, harbour authorities have to maintain the navigable depth by having dredged large amounts of mud. Some authorities relate the navigable depth to a depth at which the density is equal to a certain value, e.g. 1200 kg/m3. However, the shear...
report 1999
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Van der Wildt, H. (author)
Due to increasing dredging costs, especially in ports and estuaries where the bed often contains contaminated substances, an increased tendency is observed to the investigation for more structural solutions to prevent deposition. Before however applying such engineering schemes a thorough knowledge of the sediment dynamics is needed. In the...
master thesis 1998
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Merckelbach, L.M. (author)
Many harbours in the world suffer from high siltation rates in their basins. To guarantee safe shipping, harbour authorities have to maintain the navigable depth by dredging large amounts of mud. Some authorities relate the navigable depth to the depth at which the density is equal to a certain value, e.g. 1200 kg/m3. However, the shear strength...
report 1998
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Merckelbach, L.M. (author)
Many harbours in the world suffer from high siltation rates in their basins. To guarantee safe shipping, harbour authorities have to maintain the navigable depth by having dredged large amounts of mud. Some authorities relate the navigable depth to a depth at which the density is equal to a certain value, e.g. 1200 kg/m3. However,the shear...
report 1998
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Van der Ham, R. (author)
In 1993 an interdisciplinary research programme on the behaviour of mud in tidal waters was initiated by the The Board of NWO-BOA. The programme aims at obtaining more detailed insight in the dominant processes that govern the transport behaviour of mud. These processes have strong time variability and therefore the general approach is to obtain...
report 1996
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Van Kessel, T. (author)
In order to predict the stain and shear rate response of cohesive sediment suspensions to applied forces, their rheological properties have to be known. In this report the rheological properties of both China clay, an artificial mud, and Caland channel mud, a natural mud, are investigated. Four types of experiments are involved: equilibrium flow...
report 1996
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Van der Ham, R. (author)
Carousels have been developed in an attempt to approach the in situ hydrodynamic conditions and to obtain arealistic simulation of the erosion and deposition processes of cohesive sediments. The main advantage of a carousel over straight flumes is that effects of inflow and outflow are absent and no circulation pumps are needed which would break...
report 1996
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Merckelbach, L.M. (author)
In the framework of project Strength evolution of soft consolidating mud layers, financially supported by the Netherlands Foundation of Technology, a literature survey on consolidation theory and rheological modelling of mud was carried out. A consolidation theory, focused on the Gibson equation (Gibson et al., 1967), is presented. The solution...
report 1996
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de Wit, P.J. (author)
doctoral thesis 1995
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De Wit, P.J. (author)
A research project was carried out at the Delft University of Technology in order to study the interaction between waves as weil as a current and a muddy bed. For this purpose several experiments were made on two artificial clays, namely China Clay and Westwald Clay. The results of the experiments on China Clay were reported by De Wit (1994). In...
report 1994
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De Graaff, J. (author), Slot, R.E. (author)
Recently a lot of research is being done on cohesive sediment. It plays a major role in the shoaling of harbours and waterways, and in some serious environmental problems. To predict cohesive sediment transport, information is needed about the distributions of size and settling velocities. Many methods exist to determine sizes of suspended...
report 1993
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Atkins, R. (author), Ockenden, M.C. (author)
This report describes the development of a self-contained system for making long-term field measurements of bed elevation changes and the associated near-bed hydrodynamics and cohesive sedimentary parameters in estuarine environments. These measurements are required to ensure the understanding of these parameters and their interaction with bed...
report 1993
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De Wit, P.J. (author)
A research program was started to study the behaviour of cohesive sediments at the Delft University of Technology in 1989. As part of this project a well-provided physico-chemicallaboratory was built within the Hydromechanics Laboratory and adequate instrumentation was purchased. These new instruments and other instruments already present in the...
report 1992
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De Wit, P.J. (author)
In this report an overview will be given of the basic properties of (suspended) clay particles. In section 2 the structure of clay minerals will be described. The forces between suspended particles (section 3) and the possible consequences of them, flocculation or deflocculation (sections 4 and 5) will be discussed next. Section 7 will deal with...
report 1992
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Hu, S. (author)
This paper presents the study on the self-weight consolidation, which is referred to the consolidation problem of cohesive deposits in reservoirs and based on Gibson's theory of non-linear finite-strain consolidation. The analytical solution of the linearized equation is carried out. The solution shows that the consolidation is dominated by the...
report 1990
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