| Summary: | 碩士 === 淡江大學 === 水資源及環境工程所 === 82 === The incident waves on the beach and the following uprush and
backwash phenomenon change the beach profile due to the sedi-
mentation.The main purpose of this study is to investigate the
onshore-offshore sedimentation on a sloping beach and its
effect to the quantities of the eroded dune. By using the flume
experiments. We examined the dune erosion and the sedimentation
on the slope. The sedimens were transported form the offshore
to the foreshore region in according to the wave shoreward
propagation. The dune was eroded when the waves collide dune.
That makes the dune backward.As waves backwash,some eroded
sands were carried offshore and some were stored in front of
dune.Therefore the topographer was changed by the action of
waves. In the beginning,the beach topographer was changed
intensively because of the waves action. The longer the
experiment took, the closer the equilibrium beach was reached.
We will discuss the quantities of the sedimentation and the
eroded dune for different wave heights,beach slopes,dune
locations and wave periods. The relation between wave steepness
and bar steepness have also been studied.
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