Boundary Shear Stress Distributions in Compound Channels Having Narrowing and Enlarging Floodplains

2021 ◽  
pp. 127-141
Author(s):  
Kamalini Devi ◽  
Bhabani Shankar Das ◽  
Jnana Ranjan Khuntia ◽  
Kishanjit Kumar Khatua
Keyword(s):  
Shear Stress ◽  
Stress Distributions ◽  
Compound Channels ◽  
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.

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