Laboratory study on effects of vegetations on the open channel hydraulic roughness (Pennisetum Purpureum and Ipomoea Aquatica)

Ahmad, Noor Aliza and Tjahjanto, Dwi and Md Zin, Nur Shaylinda and Shakar, Muhammad Asyraff (2009) Laboratory study on effects of vegetations on the open channel hydraulic roughness (Pennisetum Purpureum and Ipomoea Aquatica). In: International Conference on Water Resources (ICWR2009) , 26-27 May 2009, Langkawi, Kedah.

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Abstract

Unrestricted growth of such vegetation in an open channel can lead to its complete loss of the hydraulic capacity which has potential to generate flood. A laboratory study has been conducted to analyze the effects of different types of vegetation to the velocity and on the Manning roughness coefficient (n) in an open channel, and to develop relationships between the characteristics of the vegetation (density, type and distribution) on the hydraulic roughness. Plants namely Napier grass and Ipomoea Aquatica have been selected for this study. From the conducted experiments, the roughness of Napier Grass is in the range of 0.0002 – 0.0073 and Ipomoea Aquatica is 0.0002-0.0062. It was also found that the Manning’s n value has a linear relationship with flow depth, vegetation arrangements and density.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Manning’s Coefficient; Napier Grass; Ipomoea Aquatica; Open Channel; Flow Resistance
Subjects:T Technology > TD Environmental technology. Sanitary engineering
Divisions:Faculty of Civil and Environmental Engineering > Department of Water and Environmental Engineering
ID Code:2755
Deposited By:Normajihan Abd. Rahman
Deposited On:07 Nov 2012 11:11
Last Modified:21 Jan 2015 15:34

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