Tractive force channel design aid

2001 ◽  
Vol 28 (5) ◽  
pp. 865-867 ◽  
Author(s):  
A Osman Akan
Keyword(s):  
Shear Stress ◽  
Open Channel ◽  
Mathematical Expression ◽  
Channel Width ◽  
Tractive Force ◽  
Channel Design ◽  
Dimensionless Parameters ◽  
Force Equation ◽  
Open Channel Design

The Manning formula and the tractive force equation are combined and written in terms of dimensionless parameters. Predetermined solutions to this equation have been obtained and presented in chart form. Also, a mathematical expression is obtained that approximates the chart to determine the channel width explicitly.Key words: open channel, design, tractive force, erodible, shear stress.

scholarly journals Entropy-Based Shear Stress Distribution in Open Channel for all types of Flow using Experimental Data

2021 ◽  
Author(s):  
Hae Seong Jeon ◽  
Ji Min Kim ◽  
Yeon Moon Choo
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Turbulent Flow ◽  
Correlation Coefficient ◽  
Open Channel ◽  
Shear Stress Distribution ◽  
Entropy Theory ◽  
Tractive Force ◽  
Design Standards ◽  
Wide Range

Abstract Korea’s river design standards set general design standards for river and river-related projects in Korea, which systematize the technologies and methods involved in river-related projects. This includes measurement methods for parts necessary for river design, but do not include information on shear stress. Shear Stress is to one of the factors necessary for river design and operation. Shear stress is one of the most important hydraulic factors used in the fields of water especially for artificial channel design. Shear stress is calculated from the frictional force caused by viscosity and fluctuating fluid velocity. Current methods are based on past calculations, but factors such as boundary shear stress or energy gradient are difficult to actually measure or estimate. The point velocity throughout the entire cross section is needed to calculate the velocity gradient. In other words, the current Korea’s river design standards use tractive force, critical tractive force instead of shear stress because it is more difficult to calculate the shear stress in the current method. However, it is difficult to calculate the exact value due to the limitations of the formula to obtain the river factor called the tractive force. In addition, tractive force has limitations that use empirically identified base value for use in practice. This paper focuses on the modeling of shear stress distribution in open channel turbulent flow using entropy theory. In addition, this study suggests shear stress distribution formula, which can be easily used in practice after calculating the river-specific factor T. and that the part of the tractive force and critical tractive force in the Korea’s river design standards should be modified by the shear stress obtained by the proposed shear stress distribution method. The present study therefore focuses on the modeling of shear stress distribution in open channel turbulent flow using entropy theory. The shear stress distribution model is tested using a wide range of forty-two experimental runs collected from the literature. Then, an error analysis is performed to further evaluate the accuracy of the proposed model. The results revealed a correlation coefficient of approximately 0.95–0.99, indicating that the proposed method can estimate shear stress distribution accurately. Based on this, the results of the distribution of shear stress after calculating the river-specific factors show a correlation coefficient of about 0.86 to 0.98, which suggests that the equation can be applied in practice.

Optimal lined channel design

2006 ◽  
Vol 33 (5) ◽  
pp. 535-545 ◽  
Author(s):  
Bülent Aksoy ◽  
A Burcu Altan-Sakarya
Keyword(s):  
Open Channel ◽  
Unit Cost ◽  
Ground Surface ◽  
Minimum Cost ◽  
Channel Design ◽  
Minimum Area ◽  
Side Slope ◽  
Bottom Width ◽  
The Cost ◽  
Open Channel Design

The optimum values of the section variables (side slope, bottom width, flow depth, and radius) for triangular, rectangular, trapezoidal, and circular channels are computed by minimizing the cost of the channel section. Manning's uniform flow formula is treated as the constraint of the optimization model. The cost function is arranged to include the cost of lining, the cost of earthwork, and the increment in the cost of earthwork with depth below the ground surface. The optimum values of section variables are expressed as explicit functions of unit cost terms. Unique values of optimum section variables are obtained for the case of minimum area or minimum wetted perimeter problems. Key words: open channel design, optimization, minimum cost, best hydraulic section.

Open channel design using Visual Basic

2008 ◽  
Vol 16 (2) ◽  
pp. 127-136 ◽  
Author(s):  
Mustafa Günal ◽  
Atilla Özcan
Keyword(s):  
Open Channel ◽  
Visual Basic ◽  
Channel Design ◽  
Open Channel Design

Open Channel Design

2005 ◽  
Author(s):  
Xing Fang
Keyword(s):  
Open Channel ◽  
Channel Design ◽  
Open Channel Design

Experimental analysis for self-cleansing open channel design

2020 ◽  
pp. 1-12 ◽  
Author(s):  
Mir Jafar Sadegh Safari ◽  
Hafzullah Aksoy
Keyword(s):  
Experimental Analysis ◽  
Open Channel ◽  
Channel Design ◽  
Open Channel Design

0 Open Channel Design

2002 ◽  
pp. 545-634
Keyword(s):  
Open Channel ◽  
Channel Design ◽  
Open Channel Design

Open Channel Design

2021 ◽  
Author(s):  
Ernest W. Tollner
Keyword(s):  
Open Channel ◽  
Channel Design ◽  
Open Channel Design

scholarly journals Entropy-Based Shear Stress Distribution in Open Channel for All Types of Flow Using Experimental Data

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1540
Author(s):  
Yeon-Moon Choo ◽  
Hae-Seong Jeon ◽  
Jong-Cheol Seo
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Turbulent Flow ◽  
Correlation Coefficient ◽  
Open Channel ◽  
Shear Stress Distribution ◽  
Entropy Theory ◽  
Tractive Force ◽  
Design Standards ◽  
Wide Range

Korean river design standards set general design standards for rivers and river-related projects in Korea, which systematize the technologies and methods involved in river-related projects. This includes measurement methods for parts necessary for river design, but does not include information on shear stress. Shear stress is one of the factors necessary for river design and operation. Shear stress is one of the most important hydraulic factors used in the fields of water, especially for artificial channel design. Shear stress is calculated from the frictional force caused by viscosity and fluctuating fluid velocity. Current methods are based on past calculations, but factors such as boundary shear stress or energy gradient are difficult to actually measure or estimate. The point velocity throughout the entire cross-section is needed to calculate the velocity gradient. In other words, the current Korean river design standards use tractive force and critical tractive force instead of shear stress because it is more difficult to calculate the shear stress in the current method. However, it is difficult to calculate the exact value due to the limitations of the formula to obtain the river factor called the tractive force. In addition, tractive force has limitations that use an empirically identified base value for use in practice. This paper focuses on the modeling of shear-stress distribution in open channel turbulent flow using entropy theory. In addition, this study suggests a shear stress distribution formula, which can easily be used in practice after calculating the river-specific factor T. The tractive force and critical tractive force in the Korean river design standards should be modified by the shear stress obtained by the proposed shear stress distribution method. The present study therefore focuses on the modeling of shear stress distribution in an open channel turbulent flow using entropy theory. The shear stress distribution model is tested using a wide range of forty-two experimental runs collected from the literature. Then, an error analysis is performed to further evaluate the accuracy of the proposed model. The results reveal a correlation coefficient of approximately 0.95–0.99, indicating that the proposed method can estimate shear-stress distribution accurately. Based on this, the results of the distribution of shear stress after calculating the river-specific factors show a correlation coefficient of about 0.86 to 0.98, which suggests that the equation can be applied in practice.

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