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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Analysis on flow characteristics in natural inclined weirs through hydraulic experiments
Analysis on flow characteristics in natural inclined weirs through hydraulic experiments
Author : JIHYUN KIM(1), JONG-TAE KIM(2) & JOON-GU KANG(3) & NAM-JOO LEE(4)
ABSTRACT
Natural inclined weirs in various shapes and materials are installed in order to restore rivers and develop environmental
projects. Inclined weirs can stabilize and protect the erosion of downstream as they have flat slopes compared to a typical
round crest weir (RCW). Particularly, inclined weirs, which have environmental effects by aeration and habitat effect
caused by their materials, will be applied to river projects after various transformations in the future. However, experiments
and flow characteristic analysis on discharge conditions and structural shape of inclined weirs are very restricted. Existing
researches were mostly about erosion of diagonal weirs in downstream or scour protection (Bormann and Julien, 1991;
Song et al., 1994; Rice et al., 1998; Kim et., 2003). This study first examines the effect of basic inclined weirs then
investigates how the various changes in length, width, shape of Crest can affect flow characteristics. A 3D printer was
used to make an inclined weirs model (0.4 m กม 0.4 m กม 0.1 m) for the experiment model in this study, and the experiment
was conducted in a water way which is 0.40m in width, 12.0m in length and 0.5m in height. The experiment was
conducted in total 8 different discharge conditions (0.00183 m/s3กซ 0.01204 m/s3) and various downstream water level
condition. By measuring the water level and flow velocity, it was possible to figure out how the occurrence location of
critical flow, gage height and Velocity change, change according to the ratio of gate opening changes. This study is an
analysis of flow characteristics according to the changes in flow discharge change through hydraulic experiments. Also, it
derives the standard coefficient of various shapes of transverse inclined weirs. We were able to reach the following
conclusion through this study. The equation for stage-discharge relation curve is y = 0.2827x + 0.1236. The result of
hydraulic experiments indicates that the value for basic type of discharge coefficient lies between 0.472 and 0.599.
File Size : 467,037 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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