IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 2- HYDRO-ENVIRONMENT : EQUIVALENT ROUGHNESS OF ARTIFICIAL VEGETATION IN SUBCRITICAL FLOW
EQUIVALENT ROUGHNESS OF ARTIFICIAL VEGETATION IN SUBCRITICAL FLOW
Author : E.P. KOSTIDOU & G.C. CHRISTODOULOU
The paper focuses on determining the resistance characteristics of some selected artificial vegetation elements and patterns in terms of the friction factor f and the equivalent sand roughness ks, based on laboratory experiments. Three types of vegetation elements were used: (a) Thin rigid rods 0.5 cm in diameter and 4 cm high, always submerged; (b) Flexible plastic tubes (20 cm high) adjusted on the same rods, which were submerged or emergent depending on the flow rate; (c) Compound elements, consisting of rigid rods 0.8 cm in diameter and 5 cm high, bearing 3 cm diameter spheres on top, mostly submerged. Three patterns of each type of element were investigated, at plan densities ranging 2 from 100 to 400 stems/m . By measuring the free surface profiles, the Manning?s n coefficient was evaluated and subsequently the respective friction factor f and equivalent roughness k were determined. The results are corrected for s sidewall effects and presented in dimensionless form. Quantitative expressions are proposed relating f and k to the s density and other geometrical parameters characteristic of the vegetation array. Comparison with previous research is discussed.
File Size : 660,129 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 2- HYDRO-ENVIRONMENT
Date Published : 18/04/2016
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