| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系 === 86 === The aim of this experiment studies is undertaken to know the
directions of sand motion and the positions of local scouring
due to the effect of differentflow-training panels. It is
known by experiments that the sand motion is caused by helix
in a clockwise direction of the angle of attack is smallerthan
-π/2, no matter how large the opening of the surface panel.
The bottompanels have a critical height is about 0.5 times
local water depth at designstage. In other words, the panel''s
height is above or under the critical depthof bottom panels,
while the sand-training is quite different. The
middlepanels, not close to the surface and the bottom, only in
the case the panel''s bottom is close to the river bed have the
nearby phenomenon of depositing and scouring with the bottom
panels. In the same angle of attack with flow, the bottom
panels with the height greater than half local water depth at
design stage have the same phenomenon of depositing and
scouring with the surface panels. The open space under the
surface panel allows the flow passing, then the local scour
will take place at downstream, but the bottom panel has the
local scour at upstream nearby.
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