Stability of river bifurcations in ID morphodynamic models
作者:
Z.B. Wang,
M. De Vries,
R.J. Fokkink,
A. Langerak,
期刊:
Journal of Hydraulic Research
(Taylor Available online 1995)
卷期:
Volume 33,
issue 6
页码: 739-750
ISSN:0022-1686
年代: 1995
DOI:10.1080/00221689509498549
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Based on model-technical as well as physical considerations a nodal-point relation at bifurcations is proposed for one-dimensional (ID) network morphodynamic models: the ratio between the sediment transports into the downstream branches is proportional to a power of the discharge ratio. The influence of the nodal-point relation on the behaviour of the morphodynamic model is analyzed theoretically. The exponent in the nodal-point relation appears to be crucial for the stability of the bifurcation in the model. For large values of the exponent, the bifurcation is stable, i.e. the downstream branches remain open. For small values of the exponent, the bifurcation is unstable: only one of the branches tends to remain open. The exponent also has a strong influence on the morphological time scales of the network. The conclusions from the analysis have been verified by numerical simulations using a package for one-dimensional network modelling.
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