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) ALL CONTENT : Hydro-environment : Manning's coefficient of alternatively arranged sandbars with tree vegetation
Manning's coefficient of alternatively arranged sandbars with tree vegetation
Author : KOHJI MICHIOKU (1), KEIICHI KANDA (2) SHUNICHI KOMETANI (3), YOSHIYUKI IRIE (4) & CHINAMI SAKAMOTO (4)
ABSTRACT
Recently, many river channels tend to be densely vegetated due to regime shifts in hydrological, fluvial and ecological
processes. It is a critical engineering issue for flood control and management to evaluate the conveyance capacity of
vegetated channels. In this study, an equivalent Manning¡¯s coefficient nv of vegetation canopy drag in an open channel of
compound cross section with alternatively arranged floodplain is analyzed by using a two-dimensional two-layer (2D2L)
model. It is found that nv monotonically increases with increasing discharge when vegetation is emerged. On the other
hand, nv gradually decreases with discharge in the case of submergent vegetation. The numerical solutions of flow
structure and nv is compared with experimental data to verify the model and satisfactory agreement between the analysis
and the experiment is recognized.
File Size : 2,107,211 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 20/08/2015
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