Boundary shear stress distributions in trapezoidal channels

2005 ◽  
Vol 43 (1) ◽  
pp. 98-102 ◽  
Author(s):  
Shu-Qing Yang ◽  
Siow-Yong Lim
Keyword(s):  
Shear Stress ◽  
Stress Distributions ◽  
Boundary Shear ◽  
Boundary Shear Stress

scholarly journals Modelling boundary shear stress distribution in open channels using a face recognition technique

2016 ◽  
Vol 19 (2) ◽  
pp. 157-172 ◽  
Author(s):  
Pedro Martinez-Vazquez ◽  
Soroosh Sharifi
Keyword(s):  
Shear Stress ◽  
Face Recognition ◽  
Stress Distribution ◽  
Shear Stress Distribution ◽  
Open Channels ◽  
Stress Distributions ◽  
Boundary Shear ◽  
Boundary Shear Stress ◽  
Mean Square Errors ◽  
Recognition Technique

This paper describes a novel application of a pattern recognition technique for predicting boundary shear stress distribution in open channels. In this approach, a synthetic database of images representing normalized shear stress distributions is formed from a training data set using recurrence plot (RP) analysis. The face recognition algorithm is then employed to synthesize the RPs and transform the original database into short-dimension vectors containing similarity weights proportional to the principal components of the distribution of images. These vectors capture the intrinsic properties of the boundary shear stress distribution of the cases in the training set, and are sensitive to variations of the corresponding hydraulic parameters. The process of transforming one-dimensional data series into vectors of weights is invertible, and therefore, shear stress distributions for unseen cases can be predicted. The developed method is applied to predict boundary shear stress distributions in smooth trapezoidal and circular channels and the results show a cross correlation coefficient above 92%, mean square errors within 0.04% and 4.48%, respectively, and average shear stress fluctuations within 2% and 5%, respectively, thus indicating that the proposed method is capable of providing accurate estimations of the boundary shear stress distribution in open channels.

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
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