Analysis of the Roughness Coefficient of Overflow in a Drainage Pipeline with Sedimentation
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 13, Issue 4
Abstract
Flow resistance is a critical calculation parameter in hydraulic engineering. In this study, the roughness coefficient of a circular drainage pipe with sedimentation was investigated under open-channel flow conditions using experimental measurements and numerical calculations. The ratio of the height of the sediment placed in the pipe to the diameter was defined as the sedimentation degree. The Manning roughness coefficient () was determined for pipes with different sedimentation degrees. Moreover, numerical simulations were performed for circular pipes with diameters of 0.152 m and a slope of 0.003, with discharges varying between 1 and . The results of the numerical calculations were validated in terms of the water surface and Manning’s using the corresponding experimental data. Accordingly, an equation in the form of the Moody formula was proposed to estimate the roughness coefficient. Subsequently, the predicted Manning roughness coefficient obtained through the proposed equation was compared with independent experimental results. The results indicate that the equation accurately predicts Manning’s in a pipe with sedimentation, which can provide a theoretical basis for the design of drainage pipelines.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was supported by the National Key Research and Development Program of China (Grant No. 2017YFC1501204), National Natural Science Foundation of China (Grant Nos. 52008375, 51909242, and 52009125), Program for Science and Technology Innovation Talents in Universities of Henan Province (Grant No. 19HASTIT043), Key scientific research projects of colleges and universities in Henan Province (Grant No. 21A570007), and Youth Talent Promotion Project of Henan Province (Grant No. 2021HYTP021).
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 13 • Issue 4 • November 2022
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© 2022 American Society of Civil Engineers.
History
Received: Sep 29, 2021
Accepted: Apr 8, 2022
Published online: Jun 28, 2022
Published in print: Nov 1, 2022
Discussion open until: Nov 28, 2022
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