Distribution of primary and secondary currents in sine-generated bends

Authors

  • Li He Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

DOI:

https://doi.org/10.4314/wsa.v44i1.14

Keywords:

primary flow, secondary flow, meander, numerical analysis

Abstract

The secondary circulation in a meandering channel redistributes the velocity over the bend. However, the shift of primary flow by secondary currents is not quantitatively understood, due to the difficulty in isolating the role of curvature-driven secondary flow from that of topography-driven secondary flow in bed-deformed meanders. The influences of curvature-driven and topography-driven secondary currents on the redistribution of primary flow in sine-generated meandering channels were examined by CCHE2D. The model is calibrated using data measured in two sets of laboratory experiments including flat-bed flow and mobile-bed flow. Analysis indicated that topography-induced current mainly contributes to the redistribution of primary flow from inner to outer bank in the curved channels, rather than the secondary flow driven by curvature.

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Published

2018-01-31

How to Cite

He, L. (2018). Distribution of primary and secondary currents in sine-generated bends. Water SA, 44(1 January). https://doi.org/10.4314/wsa.v44i1.14

Issue

Vol. 44 No. 1 January (2018): Water SA

Section

Research paper

License

Creative Commons License

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