Effect of flow resistance in open rectangular channel

Ahmad, Noor Aliza and Saiful Bahry, Saiful Iswal and Md Ali, Zarina and Mat Daud, Azra Munirah and Musa, Sabariah (2017) Effect of flow resistance in open rectangular channel. MATEC Web of Conferences, 97 (01107). pp. 1-6. ISSN 2261236X

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Official URL: DOI:10.1051/matecconf/20179701107

Abstract

The determination of flow resistance for open channels remains a challenge in practices. In this research, an experimental study was carried out to investigate the hydraulic roughness characteristics in an open channel. The experimental flume (10 m length, 0.30 m width and 0.46 height) was carried out with two conditions ; contain gravel bed and without gravel bed (as controller). Blocks of concrete foam were fabricated and laid on the bed surface for providing uniformly roughened along the open channel. A velocity flow meter was used to quantify the average velocity, and other parameters such as cross-section, hydraulic radius, wetted perimeter, and channel slopes were also calculated. Finally, the flow resistance, n obtained using the flume with gravel bed surface is higher than the flume without gravel bed surface. The flow conditions were declared as subcritical as the Froude number is less than 1 for both conditions in the flume. As a conclusion, it was identified that the hydraulic roughness n, was influenced by the type bed roughness, flow rate and channel slope.

Item Type:Article
Subjects:Q Science > QC Physics
Divisions:Faculty of Civil and Environmental Engineering > Department of Water and Environmental Engineering
ID Code:9474
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:13 Aug 2018 11:16
Last Modified:13 Aug 2018 11:16

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