| Summary: | 碩士 === 國立臺灣大學 === 農業工程學系 === 81 === In this study, a depth-averaged two-dimensional movable bed
model for river using Galerkin finite element method was
employed . The model which includes hydrodynamic model and
sediment transport model are used to calculate stages, velocity
and sediment transport in river. In order to verify the
adaptability and applicability of the hydrodynamic model, the
experiment data from the parallel bridge piers by
Yarnell(1934) and simulation results from FESWMS model were
chosen for comparison. Besidesis, tidal effects in a compound
channel with 880 ft in length, 400 ft in width and its
tributary with 80 ft in width are simulated and analyed. Then,
local flow field was simulated in Keelung River due to
operation of pumping station. For sediment transport model ,
the experiment data from the channel-contraction by Prof. Yen
are used for simulation and comparison. Finally, the model are
applied to Keelung river to predict the behavior of the
sediment aggradation/degradation and the changes in the river
bed. It reveals that the present model adopted is successful
and efficient for the simulation flow field and sediment
transport applied in rivers with bridges, confluence and tidal
effects.
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