2D finite element modeling of bed elevation change in a curved channel. S.-U. Choi, T.B. Kim, & K.D. Min Yonsei University Seoul, KOREA. Introduction. Most natural streams are sinuous and meandering.
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2D finite element modeling of bed elevation change in a curved channel
S.-U. Choi, T.B. Kim, & K.D. Min
Engelund & Hansen’s formula
(a) Under a flat (& fixed) bed condition
- The centrifugal force makes higher flow depth, but lower mean velocity, at the outer bank. This generates the secondary flows satisfying the continuity.
- Observed in Experiments and Numerical simulations.
(b) Under a mobile bed condition
- Secondary flows induces sediment erosion & deposition at the outer & inner banks, respectively.
- The flow depth and mean velocity at the inner bank is lower.
- Observed in natural meandering rivers and Experiment by Yen (1967 & 70)
(Struiksma et al., 1985)
1. 180º Curved Channel Experiment
Lab. of Fluid Mech. (LFM) in Delft Univ. of Tech.(Sutmuller & Glerum, 1980)
2. 140º Curved Channel Experiment
Delft Hydraulics Lab. (DHL)
Measured data by
Sutmuller & Glerum (1980)