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Critical shear stress approach for self-cleansing design of a rectangular channel

International Journal of Sediment Research 2021年第5期36卷 678-685页

作者： Charles Hin Joo Bong San Chuin Liew Fang Yenn Teo Tze Liang Lau Aminuddin Ab Ghani Faculty of Engineering Universiti Malaysia Sarawak 2. Faculty of Engineering Computing and Science Swinburne University of Technology Sarawak Campus 3. Faculty of Science and Engineering University of Nottingham Malaysia 4. School of Civil Engineering Universiti Sains Malaysia Engineering Campus River Engineering and Urban Drainage Research Centre (REDAC) Universiti Sains Malaysia Engineering Campus

The current study aims at the development of an incipient motion equation and a self-cleansing design chart based on the critical shear stress approach for a rectangular channel. Data from previous experimental work on incipient motion for rectangular flumes were subjected to multiple linear regression analysis. Selected regression models were further assessed through cross validation using the remaining data from the previous experimental work and a performance test using another three sets of existing data from the literature. The best regression model from the current study was found to perform much better than two of the existing equations in the literature by Novak and Nalluri and El-Zaemey with respect to having 95% of the predicted values fall within the acceptable discrepancy ratio range of 0.5 e2.0. The equations by Novak and Nalluri and El-Zaemey only managed to have 10% and 16%, respectively, of the predicted values fall within the acceptable discrepancy ratio. The developed best regression model has a coefficient of determination (Rp2) value of 0.9960, adjusted coefficient of determination (Radj2)value of 0.9960, predicted coefficient of determination (Rpre2) value of 0.9958, mean square error(MSE)value of 0.0004, and Mallow’s Cpvalue of 3.0. The best regression model was further chosen to develop a self-cleansing design chart for rectangular channels. The design chart which relates the minimum sewer slope Sminwith the minimum critical shear stress, tc, for the respective standard rectangular channel size of an open channel system could be used to check and determine the suitable minimum slope for selfcleansing design purposes.

关键词： Design chart incipient motion equation Open channel system Rectangular channel Self-cleansing Shear stress

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