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http://dx.doi.org/10.17820/eri.2017.4.4.207

Measurement and Analysis of Bed Shear Stresses in Compound Open Channels using the Preston Tube  

Lee, Du Han (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Kim, Myounghwan (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Kim, Won (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Seo, Il Won (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Ecology and Resilient Infrastructure / v.4, no.4, 2017 , pp. 207-215 More about this Journal
Abstract
Hydraulic issues such as flow resistance, side wall correction, sediment, erosion and deposition, and channel design have close relation with distribution of bed shear stresses but the measurement of the distribution of bed shear stresses is not easy. In this study the Preston tube which makes possible relatively simple measurement of bed shear stresses is used to analyze the characteristics of bed shear distribution in compound open channels with different depth ratio. The Preston tubes are made and calibrated to develop the calibration formula and then they are applied to measure bed shear stress distribution in 5 cases depth ratio condition of compound channels. The results are compared with former experiment data, and characteristics of bed shear stress distributions are studied with different channel scales and Reynolds numbers. Although bed shear distributions with depth ratio show overall agreement with former studies, some differences are verified in bed shear variation, formation of inflection point in main channel, and distribution near floodplain junction which are due to high Reynolds number. Through the study applicability of the Preston tubes are also verified and characteristics of bed shear distribution in compound channels are suggested with Reynolds number and depth ratio.
Keywords
Bed shear stresses; Compound channels; Depth ratio; Reynolds number; The Preston tube;
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