Calculation of bed load based on the measured data of suspended load |
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Authors: | Chang-Tai Tsai Chih-Heng Tsai Chun-Hung Weng Jinn-Jong Bair Ching-Nuo Chen |
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Institution: | (1) Department of Hydraulics and Ocean Engineering, National Cheng-Kung University, No. 1, University Road, Tainan City, 70101, Taiwan;(2) Department of Resources and Environment, Leader University, No. 188, Section 5, Anjhong Road, Tainan City, 70970, Taiwan;(3) Chia-Nan Irrigation Association, No. 25, yu-ai Street, Tainan City, 70041, Taiwan |
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Abstract: | This paper proposes a method for establishing both the velocity profile and concentration profile for suspended sediment based
on measured data consisting of average velocity and average suspended sediment concentration in the river and the irrigation
channel. In addition, a numerical model for computing suspended load and bed load was also developed for computing bed load
transport rate when measurable load is available. In this study, bed loads for published laboratory and field sediment data
were computed using the presently developed numerical model based on four different bed layer thicknesses. The computed bed
loads were found to be in reasonable agreement with the values from Einstein’s bed load function when the thickness of the
bed layer was taken at 10θd or 0.05D. The numerical model developed in this study may be used to evaluate the validities of other bed load formulas. |
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