A new series of laboratory experiments was performed in the Aberdeen Oscillatory Flow Tunnel (AOF... more A new series of laboratory experiments was performed in the Aberdeen Oscillatory Flow Tunnel (AOFT) and the Large Oscillating Water Tunnel (LOWT) to investigate time-averaged suspended sand concentrations and transport rates over rippled beds in regular and irregular oscillatory flow. The wave-induced oscillatory near-bed flows were simulated at full-scale. Five series of experiments were carried out. During the two AOFT
... 12 Jos SLJ van Alphen 1) FrankP.HaUie2) Jan S. Ribberink 3) JA Roelvink 3) Cees J. Louisse 4)... more ... 12 Jos SLJ van Alphen 1) FrankP.HaUie2) Jan S. Ribberink 3) JA Roelvink 3) Cees J. Louisse 4) ... A persistent landward residual bottom current of about 0.03 m/s. exists on the Dutch shoreface (Van der Giessen et al., 1990). ...
To develop and enhance international collaboration in the area of coastal sediment transport proc... more To develop and enhance international collaboration in the area of coastal sediment transport processes. The primary objectives of our collaboration are to further the theoretical and experimental investigations of the smaller-scale physical processes which must be incorporated in the development of a local model for sand transport and morphological evolution in coastal regions, including bedform prediction, local boundary layer hydrodynamics and a description of sediment dynamics covering the region from the immobile seabed to the overlying dilute suspension, incorporating both bedload and suspended load modes of sand transport.
We present here a new conductivity-based system for measuring concentrations and grain velocities... more We present here a new conductivity-based system for measuring concentrations and grain velocities in the sheet-flow layer. The system is equipped with a new technique that translates measured concentrations back into vertical sensor movement, which enables the measuring probes to track a dynamic bed level. The new CCM system was applied for the first time during a series of swash zone experiments with bichromatic wave conditions. The results show a rapid erosion event with an erosion depth of an estimated 5 mm at the start of the uprush, after which the suspended sediment is advected to the upper swash. Sediment is transported back and deposited to the lower swash mainly during the second half of the backwash. The sheet-flow behaviour clearly differs from observations for non-breaking waves, with both the vertical concentration gradient and its mean vertical position varying within the wave group cycle.
The experimental conditions and preliminary results of the CoSSedM (Coupled High Frequency Measur... more The experimental conditions and preliminary results of the CoSSedM (Coupled High Frequency Measurement of Swash Sediment Transport and Morphodynamic) Hydralab IV access project have been introduced. Large scale mobile bed experiments were performed at the CIEM/UPC wave flume aiming to obtain detailed measurements of the hydrodynamics, sediment transport and bed evolution at the inner surf and swash zones. Bichromatic wave conditions were generated with different group periods but similar energetic content. Preliminary results have shown that the measured profiles display a different beach evolution as a function of the wave group period increasing the breaker bar cross-shore position respect to the initial SWL and reducing the shoreline erosion as the wave group increases. New conductivity (CCM+) based sediment concentration measurements at the swash zone sheet flow layer have been resented for a specific bichromatic wave condition. The CCM+ system also allowed wave group averaged b...
Shoaling short gravity waves at sea approaching the shore become asymmetric and are able to gener... more Shoaling short gravity waves at sea approaching the shore become asymmetric and are able to generate a net resulting sand transport in cross-shore direction (on-shore-offshore transport). The wave-related sand transport is still very difficult to predict due to the complexity of its underlying processes, which mainly take place in a thin layer near the sea bed in the wave boundary
Abstract Many existing practical sand transport formulae for the coastal marine environment are r... more Abstract Many existing practical sand transport formulae for the coastal marine environment are restricted to limited ranges of hydrodynamic and sediment conditions. This paper presents a new practical formula for net sand transport induced by non-breaking waves ...
... in completing the experiments, are thanked as well, in particular Maarten Kleinhans, Jebbe va... more ... in completing the experiments, are thanked as well, in particular Maarten Kleinhans, Jebbe van der Werf, Michel Zuijderwijk, Dominic van der A, Lorna Campbell, Luca Cavallaro, Joris Eekhout, Wouter Kranenburg, Freek Huthoff, Tommer Vermaas and Christien Huisman. ...
A new series of laboratory experiments was performed in the Aberdeen Oscillatory Flow Tunnel (AOF... more A new series of laboratory experiments was performed in the Aberdeen Oscillatory Flow Tunnel (AOFT) and the Large Oscillating Water Tunnel (LOWT) to investigate time-averaged suspended sand concentrations and transport rates over rippled beds in regular and irregular oscillatory flow. The wave-induced oscillatory near-bed flows were simulated at full-scale. Five series of experiments were carried out. During the two AOFT
... 12 Jos SLJ van Alphen 1) FrankP.HaUie2) Jan S. Ribberink 3) JA Roelvink 3) Cees J. Louisse 4)... more ... 12 Jos SLJ van Alphen 1) FrankP.HaUie2) Jan S. Ribberink 3) JA Roelvink 3) Cees J. Louisse 4) ... A persistent landward residual bottom current of about 0.03 m/s. exists on the Dutch shoreface (Van der Giessen et al., 1990). ...
To develop and enhance international collaboration in the area of coastal sediment transport proc... more To develop and enhance international collaboration in the area of coastal sediment transport processes. The primary objectives of our collaboration are to further the theoretical and experimental investigations of the smaller-scale physical processes which must be incorporated in the development of a local model for sand transport and morphological evolution in coastal regions, including bedform prediction, local boundary layer hydrodynamics and a description of sediment dynamics covering the region from the immobile seabed to the overlying dilute suspension, incorporating both bedload and suspended load modes of sand transport.
We present here a new conductivity-based system for measuring concentrations and grain velocities... more We present here a new conductivity-based system for measuring concentrations and grain velocities in the sheet-flow layer. The system is equipped with a new technique that translates measured concentrations back into vertical sensor movement, which enables the measuring probes to track a dynamic bed level. The new CCM system was applied for the first time during a series of swash zone experiments with bichromatic wave conditions. The results show a rapid erosion event with an erosion depth of an estimated 5 mm at the start of the uprush, after which the suspended sediment is advected to the upper swash. Sediment is transported back and deposited to the lower swash mainly during the second half of the backwash. The sheet-flow behaviour clearly differs from observations for non-breaking waves, with both the vertical concentration gradient and its mean vertical position varying within the wave group cycle.
The experimental conditions and preliminary results of the CoSSedM (Coupled High Frequency Measur... more The experimental conditions and preliminary results of the CoSSedM (Coupled High Frequency Measurement of Swash Sediment Transport and Morphodynamic) Hydralab IV access project have been introduced. Large scale mobile bed experiments were performed at the CIEM/UPC wave flume aiming to obtain detailed measurements of the hydrodynamics, sediment transport and bed evolution at the inner surf and swash zones. Bichromatic wave conditions were generated with different group periods but similar energetic content. Preliminary results have shown that the measured profiles display a different beach evolution as a function of the wave group period increasing the breaker bar cross-shore position respect to the initial SWL and reducing the shoreline erosion as the wave group increases. New conductivity (CCM+) based sediment concentration measurements at the swash zone sheet flow layer have been resented for a specific bichromatic wave condition. The CCM+ system also allowed wave group averaged b...
Shoaling short gravity waves at sea approaching the shore become asymmetric and are able to gener... more Shoaling short gravity waves at sea approaching the shore become asymmetric and are able to generate a net resulting sand transport in cross-shore direction (on-shore-offshore transport). The wave-related sand transport is still very difficult to predict due to the complexity of its underlying processes, which mainly take place in a thin layer near the sea bed in the wave boundary
Abstract Many existing practical sand transport formulae for the coastal marine environment are r... more Abstract Many existing practical sand transport formulae for the coastal marine environment are restricted to limited ranges of hydrodynamic and sediment conditions. This paper presents a new practical formula for net sand transport induced by non-breaking waves ...
... in completing the experiments, are thanked as well, in particular Maarten Kleinhans, Jebbe va... more ... in completing the experiments, are thanked as well, in particular Maarten Kleinhans, Jebbe van der Werf, Michel Zuijderwijk, Dominic van der A, Lorna Campbell, Luca Cavallaro, Joris Eekhout, Wouter Kranenburg, Freek Huthoff, Tommer Vermaas and Christien Huisman. ...
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