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Clémentine Chirol, Carl L. Amos, Hachem Kassem, Alice Lefebvre, Georg Umgiesser and Andrea Cucco
Estimates of bed roughness used for predictions of sediment transport are usually derived either from simple scalars of the physical roughness (i.e., ripple height or grain size) or from the hydrodynamic roughness length (Zo) based upon velocity gradient...
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Alessio Nicosia, Francesco Giuseppe Carollo and Vito Ferro
Flow resistance in gravel-bed channels is not only affected by the shape and size of the roughness elements, but also by their arrangement on the channel bed surface (position to flow streamlines, spacing between elements, and their protrusion from the c...
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Ahmed Elkaseer, Amal Charles, Stella Schneider and Steffen G. Scholz
The work reported in this article leads towards the potential development of functionally graded structures and components using laser powder bed fusion.
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Thorsten Stoesser, Richard McSherry and Bruno Fraga
Large-eddy simulations (LES) of the flow over a non-uniformly roughened channel bed are carried out to study the effect of non-uniform bed roughness on turbulence driven secondary currents and turbulence statistics. The channel bed is comprised of altern...
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Michael Mayerhofer, Stefan Brenner, Ricardo Helm, Samira Gruber, Elena Lopez, Lukas Stepien, Gerald Gold and Günther Dollinger
Compared to conventional manufacturing, additive manufacturing (AM) of radio frequency (RF) cavities has the potential to reduce manufacturing costs and complexity and to enable higher performance. This work evaluates whether normal conducting side-coupl...
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Guilherme da Cruz dos Reis, Tatiane Souza Rodrigues Pereira, Geovanne Silva Faria and Klebber Teodomiro Martins Formiga
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Sara Pascolo, Marco Petti and Silvia Bosa
Lagoons and coastal semi-enclosed basins morphologically evolve depending on local waves, currents, and tidal conditions. In very shallow water depths, typical of tidal flats and mudflats, the bed shear stress due to the wind waves is a key factor govern...
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Masoud Kazem, Hossein Afzalimehr, Mohammad Nazari-Sharabian and Moses Karakouzian
Determination of skin friction factor has been a controversial topic, particularly in gravel-bed rivers where total flow resistance is influenced by the existence of small-scale skin roughness and large-scale topographic forms. The accuracy of existing m...
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Nasrin Hassanpour, Ali Hosseinzadeh Dalir, Davod Farsadizadeh and Carlo Gualtieri
The paper presents the results of an experimental study carried out to investigate the effect of geometric and hydraulic parameters on energy dissipation and location of the hydraulic jump, with a change in the height of roughness elements and the diverg...
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Daniel Howe, Chris E. Blenkinsopp, Ian L. Turner, Tom E. Baldock and Jack A. Puleo
Robust measurements of bed shear stress under wave runup flows are necessary to inform beachface sediment transport modelling. In this study, direct measurements of swash zone bed shear stress were obtained in medium and prototype-scale laboratory experi...
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Ludovic Cassan, Hélène Roux, Pierre-André Garambois
Pág. 1 - 18
A friction model resulting from investigations into macro-roughness elements in fishways has been compared with a broad range of studies in the literature under very different bed configurations. In the context of flood modelling or aquatic habitats, the...
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Xiangju Cheng, John S. Gulliver and Dantong Zhu
One of the most uncertain parameters in stepped spillway design is the length (from the crest) of boundary layer development. The normal velocity profiles responding to the steps as bed roughness are investigated in the developing non-aerated flow region...
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Haoran Liu, Kehui Xu, Bin Li, Ya Han and Guandong Li
Machine learning classifiers have been rarely used for the identification of seafloor sediment types in the rapidly changing dredge pits for coastal restoration. Our study uses multiple machine learning classifiers to identify the sediment types of the C...
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Yi Xu, Manousos Valyrakis, Gordon Gilja, Panagiotis Michalis, Oral Yagci and Lukasz Przyborowski
A few decades ago, river erosion protective approaches were widely implemented, such as straightening the river course, enhancing riverbed/bank stability with layers of concrete or riprap, and increasing channel conveyance capacity (i.e., overwidening). ...
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Fang Ding, Lin Wang, Iryna Dronova and Kun Cao
Beijing-1 and ENVISAT ASAR images were used to classify wetland aquatic macrophytes in terms of their plant functional types (PFTs) over the Poyang Lake region, China. Speckle noise filtering, systematic sensor calibration within the same polarization or...
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Huidi Liang, Wei Chen, Wenlong Liu, Tinglu Cai, Xinkai Wang and Xiaoming Xia
Sea level rise (SLR) due to climate change is expected to alter tidal processes and energy transport, disproportionately affecting coastal communities. Utilizing a nested hydrodynamics model, we provided an integrated investigation of tidal responses to ...
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Chunye Hu, Jialing Hao and Zhen Liu
Classical eddy viscosity model deviates from the actual mean current profiles, when calculating the mean current profiles over rippled-beds in the presence of non-breaking waves, owing to the neglect of the enhancement of the wave boundary layer thicknes...
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Toms Torims, Guntis Pikurs, Samira Gruber, Maurizio Vretenar, Andris Ratkus, Maurizio Vedani, Elena López and Frank Brückner
Continuous developments in additive manufacturing (AM) technology are opening up opportunities in novel machining, and improving design alternatives for modern particle accelerator components. One of the most critical, complex, and delicate accelerator e...
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Ichiro Kimura, Taeun Kang and Kazuo Kato
The accumulation of driftwood during heavy rainfall may block river channels and damage structures. It is necessary to mitigate such effects by periodically capturing and removing driftwood from rivers. In this study, the behavior of driftwood in open-ch...
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Rutger W. A. Siemes, Bas W. Borsje, Roy J. Daggenvoorde and Suzanne J. M. H. Hulscher
Salt marshes are increasingly recognized as resilient and sustainable supplements to traditional engineering structures for protecting coasts against flooding. Nevertheless, many salt marshes face severe erosion. There is a consensus that providing struc...
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