Page 53 - 雕鐫海之角

海蝕平臺 海蝕崖

Marine platforms Sea cliffs

由於破壞性波浪不斷沖擊海岸，且波浪能量
海崖形成後，進一步侵蝕，使海崖後退，經
集中於突出的海岸，久而久之，坡腳被侵蝕，形
長時間侵蝕，海崖底部變平坦，稱為海蝕平臺。
成陡崖的形狀；若經進一步侵蝕，使海蝕凹壁擴
漲潮時，海蝕平臺會被潮水所淹蓋，只在退潮時
大，其上部的岩體懸空，最後崩塌，形成陡斜岩
才露出水面。隨著海蝕平臺增寬及被抬升，波浪
面，即是海蝕崖。鼻頭角的海蝕崖下，常堆積著
愈來愈難侵蝕海蝕崖底部，而脫離海水侵蝕的範
崩塌的石塊，等待繼續風化，並被海水侵蝕。
圍。
Sea cliffs are the result of coastal erosion by
Marine platforms are formed by wave erosion.
wave action. Sometimes, as a result of sustained wave
Constant wave attack at the same location over a long
action, a notch is formed at the base of the cliff. The
time period can eventually result in the formation of a
notch may continue to develop and in time the rock
sea cave and platform. These caves may be subjected
above the notch topples under gravity resulting in cliff
to tectonic uplift and then stranded far above the
retreat.
beach after the sea level falls. These formations are a
good indicator of sea level change.

地質圖書 Geopark at Northeast and Yilan Coast National Scenic Area