Coastal destruction

…The phenomenon in which the equilibrium of sand drift in the offshore or longshore direction is broken, causing the coastal soil to be lost and the shoreline to recede is called coastal erosion (destruction), and a coast where erosion is occurring is called an eroded coast. The bottom sediments such as sand and gravel that make up the beach are constantly moving due to the action of waves and longshore currents. The phenomenon in which beach sand and gravel are transported by these waves and currents is called sand drift (sand drift can also include blown sand, that is, the transport of beach sand by wind). Sand drift is particularly noticeable from the outer shore to the foreshore, and causes changes in the beach topography and the coastal shoreline. …

*Some of the terms mentioned in the "coast destruction" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…岸沖方向や沿岸方向の漂砂（ひようさ）の平衡が破れて，海岸の土砂が失われ，汀線が後退する現象を海岸浸食(欠壊)といい，浸食が起こっている海岸を浸食海岸という。海浜を構成している砂や礫などの底質は，波や沿岸の流れの作用によってたえず移動している。この波や流れによる海浜の砂礫の輸送現象が漂砂である(飛砂，つまり風による海浜砂の輸送をも漂砂に含めることがある)。漂砂は外浜（そとはま）から前浜（まえはま）にかけて特に著しく，海浜地形や海岸汀線の変化をもたらす。…

※「海岸欠壊」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報