Results 11 to 20 of about 774 (212)
BED TOPOGRAPHY, BED SHEAR STRESS DISTRIBUTION AND VELOCITY FIELD IN A CONFLUENCE [PDF]
PROCEEDINGS OF HYDRAULIC ENGINEERING, 1990 Laboratory experiment in 60-degree confluence was conducted using wellgraded sand under active bedload condition for a discharge ratio of 0.6. The equilibrium channel bed was fixed and detailed measurements of mean flow were then carried out. Thereby, bed topography, two component velocity measurements, bed shear stress distribution and two counter ...
Weerakoon, S. B. +2 more
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The assessment of shear stress and bed stability in stream ecology [PDF]
Freshwater Biology, 2010 Summary1. Substratum stability and shear stress exerted by flowing water can have a strong influence on the structure of benthic communities. Bed stability can be characterised in a variety of ways, e.g. flow competence, threshold of particle entrainment, measures of erosion and deposition, particle transport distance, abrasion and bedload transport ...
Schwendel, Arved +2 more
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Journal of Hydrology and Hydromechanics, 2023 The present study aims to focus the turbulent flow characteristics over arrays of submerged boulders in a gravel bed stream. Round shaped boulders of diameter, Dc = 6 cm were staggered over a gravel bed stream (d50 = 4 cm) with varying boulder-to-boulder
Datta Akash, Das Ratul, Majumder Mrinmoy
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Shear stress measured on beds and wheelchairs
Journal of Rehabilitation Medicine, 1997 Local shear is understood to be one of the principal risk factors for the development of pressure sores. There is a need for a small deformable sensor that can measure the shear force between skin and deformable materials without disturbing the shear phenomenon. In the present study a new shear sensor is introduced with a contact area of 4.05 cm2.
Goossens, RHM +4 more
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Theoretical and experimental analysis on the interaction properties between tracks and sediments considering sand content for unmanned underwater tracked bulldozer [PDF]
Bulletin of the Polish Academy of Sciences: Technical Sciences, 2021 The unmanned underwater tracked bulldozer (UUTB) is an indispensable equipment for dredging and cleaning obstacles on the river bed in the flood season.
Yong Li, Dingchang He, Qiaorui Si
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Experimental study on incipient condition of fluidized bed sediment in oscillatory [PDF]
E3S Web of Conferences, 2019 In this paper, the incipient condition of the fluidized bed sediment with different sizes and water contents were experimentally studied in an os- cillatory tunnel made of acrylic boards. One-hundred experimental runs were performed with sediment samples
Wang Rui, Yu Guoliang
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Measurement of Bed Shear Stress Under Waves
Coastal Engineering 1972, 1972 Shear stress measurements on both smooth and sand roughened beds were carried out in an oscillating water tunnel using a flexurally supported shear plate. The range of simulated wave boundary layers covered practically any situation possible in the field or laboratory.
H.P. Riedel, J.W. Kamphuis, A. Brebner
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Increasing turbidity in the North Sea during the 20th century due to changing wave climate [PDF]
Ocean Science, 2019 Data on Secchi disc depth (the depth at which a standard white disc lowered into the water just becomes invisible to a surface observer) show that water clarity in the North Sea declined during the 20th century, with likely consequences for marine ...
R. J. Wilson, R. J. Wilson, M. R. Heath
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INTERFACIAL AND BED SHEAR STRESSES IN SALINE WEDGES
Coastal Engineering Proceedings, 1982 The shear stresses and the associated friction coefficients at the interface and at the bed of an arrested saline wedge have been studied experimentally together with the detailed flow structure. Interfacial stresses, evaluated from hot film anemometer measurements and actual velocity profiles, agree well with those based on the integration of the ...
Vassilios Dermissis +1 more
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Effect of Spatial Variations in Floodplain Vegetation on Bed Shear Stress Distribution [PDF]
长江科学院院报[Objective] This study aims to investigate the effects of different vegetation arrangements (parallel and staggered) in the junction zone between channel and floodplain in urban rivers on the spatial distribution of bed shear stress, and to reveal how ...
REN Chun-ping, YANG Fan, ZHANG Yuan-yuan, WANG Hong-fei
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