| Summary: | 碩士 === 國立臺灣大學 === 土木工程學系 === 85 === Flow characteristics and sediment movement are such more
complex in river bend then in straight. Secondary flow in river
bends may be induce banks erosion and thalweg changes, is a
ticklish problem for river management. It''s helpful for planning
and desing of hydraulies engineering, if the detail of flow
conditions and sediment trasport phenomenom in river bends can
be understand. This research alters the mathemathical model
of flow and scour around bridge pier that is developed by
Tseng(1994) in order to adapt the simulation of 3D flow
condition and bed evolution in biver bends. The model together
with Smogorinsky''s subgrid-scale turbulent model uses weakly
compressible flow equations to solve velocity and pres-sure
fields with finite volume method. The topographic evolution will
be simulated in which the sediment continuity equation is solved
by the same numerical scheme, together with sediment transport
formula for bed-load. It''s verified by B.C.Yen,C.L.Yen and
Lin''s experimental result of plan bed model test,and show that
superelevation,longitudinal velocity and bed evolution can be
properly simulated.
|
|---|
