Comparison of Direct and Indirect Boundary Shear Stress Measurements along Vegetated Streambanks

2016 ◽  
Vol 32 (8) ◽  
pp. 1755-1764 ◽  
Author(s):  
L. C. Hopkinson ◽  
T. M. Wynn-Thompson
Keyword(s):  
Shear Stress ◽  
Stress Measurements ◽  
Boundary Shear ◽  
Boundary Shear Stress

An affordable and reliable device for direct bed shear stress measurements

2021 ◽  
Author(s):  
Stephan Niewerth ◽  
Francisco Núñez-González ◽  
Toni Llull
Keyword(s):  
Shear Stress ◽  
Low Cost ◽  
Large Degree ◽  
Bed Shear Stress ◽  
Flow Conditions ◽  
Stress Measurements ◽  
Boundary Shear ◽  
Shear Plate ◽  
Wide Range ◽  
Boundary Shear Stress

<p>The entrainment and transport of sediment by hydrodynamic mechanisms is strongly related to bed shear stress exerted by flow. Therefore, to quantify sediment transport and to determine sediment incipient motion conditions, accurate estimations of bed shear stress are required. Most of the existing methods used in hydraulics and river engineering to determine bed shear stress are indirect, and are mostly restricted to limited flow conditions or contain a large degree of uncertainty. Although devices to perform direct measurements of boundary shear stress exist, they are normally based on expensive technology. We developed a shear plate for direct shear stress measurements, using relatively low cost components. In this work we present preliminary results of measurements performed with the new shear plate, to characterize the bottom shear stress generated by a ship propeller. The data result in the expected quadratic relation between bed shear stress and jet velocities, and also give evidence of a good reproducibility. We show that the new shear plate appears to be a promising device for reliable measurements of submerged boundary shear stress under a wide range of environments and flow conditions.</p>

scholarly journals Boundary Shear Stress Analysis in Meandering Channels at the Bend Apex

2015 ◽  
Vol 4 ◽  
pp. 812-818 ◽  
Author(s):  
Sovan Sankalp ◽  
Kishanjit. K. Khatua ◽  
Arpan Pradhan
Keyword(s):  
Shear Stress ◽  
Stress Analysis ◽  
Meandering Channels ◽  
Boundary Shear ◽  
Boundary Shear Stress

FLOOD HYDRAULICS DUE TO EMERGENT VEGETATION ALONG A RIPARIAN ZONE IN MEANDERING CHANNELS

2016 ◽  
Vol 78 (9-4) ◽  
Author(s):  
Zulkiflee Ibrahim ◽  
Zulhilmi Ismail ◽  
Sobri Harun ◽  
Koji Shiono ◽  
Nazirah Mohd. Zuki ◽  
...  
Keyword(s):  
Shear Stress ◽  
Flow Resistance ◽  
Riparian Zone ◽  
Streamwise Vorticity ◽  
Floodplain Vegetation ◽  
Meandering Channel ◽  
Meandering Channels ◽  
Boundary Shear ◽  
Residential Properties ◽  
Boundary Shear Stress

Frequent floods around the globe including recent events in several states in Malaysia have damaged the residential properties, infrastructures and crops or even deaths. Clearing vegetations or trees on the floodplain has been pointed out as a contributing factor to the damages. Thus, the influence of floodplain vegetation on the river hydraulics during flooding must be better understood. The hydraulics of flood flows in non-erodible vegetated meandering channel was experimented in the laboratory where two-lined steel rods were installed along a riparian zone to simulate as trees. The stage-discharge relationship, flow resistance, depth-averaged velocity, streamwise vorticity and boundary shear stress patterns during shallow and deep flood inundations were studied. The findings showed that floodplain vegetation had increased the channel flow depth by 32% and its flow resistance. The velocity in vegetated zone was lowered and the shear stress reduced by 86.5% to 91% along the river meander. In addition, the trees also limit flow interaction between main channel and floodplain

Modelling boundary shear stress in highly sinuous meandering channels

2013 ◽  
Vol 20 (2) ◽  
pp. 161-168 ◽  
Author(s):  
M. Patnaik ◽  
K.C. Patra ◽  
K.K. Khatua ◽  
L. Mohanty
Keyword(s):  
Shear Stress ◽  
Meandering Channels ◽  
Boundary Shear ◽  
Boundary Shear Stress

scholarly journals Modeling effects of bank friction and woody bank vegetation on channel flow and boundary shear stress in the Rio Puerco, New Mexico

2005 ◽  
Vol 110 (F4) ◽  
pp. n/a-n/a ◽  
Author(s):  
E. R. Griffin ◽  
J. W. Kean ◽  
K. R. Vincent ◽  
J. D. Smith ◽  
J. M. Friedman
Keyword(s):  
Shear Stress ◽  
New Mexico ◽  
Channel Flow ◽  
Boundary Shear ◽  
Boundary Shear Stress
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