One-dimensional river morphodynamics with lake storage and tributary influx
Date Issued
2009
Date
2009
Author(s)
Hou, Chun-Yao
Abstract
In this thesis, experiments and mathematics are used to probe the effect of lake storage and tributaries influx on river morphodynamics. For the experiments, we use a small-scale lab tank (100~200cm length and 1cm width) to model river channel change under different test conditions. To describe the fluvial morphology in the laboratory, we then deduce a microscale fluvial model from the Saint Venant equations and Exner equations. In addition, we also find analytical solutions for different special cases. We then compare the microscale numerical model and analytical solutions with the lab data to check whether they can effectively describe the evolution of the fluvial morphology. We apply this approach to a variety of river-lake configurations observed in the field, such as barrier lake, dam breaching, and tributary-dammed lake, etc. It is formed that simple rules can lead to a variety of fluvial morphologies.
Subjects
lake
tributary
dam breaching
fluvial morphology
microscale
Type
thesis
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