期刊
WATER RESOURCES RESEARCH
卷 54, 期 12, 页码 9759-9773出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018WR022819
关键词
river morphodynamics; alternate bars; suspended load; stability analysis; nonlinear analysis; Center Manifold Projection
River bars are macroscale sediment patterns, whose main geometrical features (wavelength and amplitude) depend on the mutual interactions between hydrodynamics and sediment transport. River bars develop as an instability of the plane bed to an infinitesimal perturbation, which grows in time to eventually reach a finite amplitude. We here determine, with reference to both bed and suspended loads, a closed form for the finite amplitude, through the nonlinear Center Manifold Projection technique. Results show that suspension plays a destabilizing role in bar instability, affecting both the bar wavelength (linear analysis) and the bar amplitude (weakly nonlinear analysis). This proves the importance of considering suspended load for practical purposes. The outcomes of the model are satisfactorily compared with field observations.
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