A Laboratory study of the erosion coastal dune

• Main Authors: Yung-Ching Tsou, 鄒永慶
• Other Authors: I-Chen Lin
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/88112922432316737837

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.