noun
avulsion; natural separation of land by water
Technical legal/geographical term for the sudden removal of land by the action of water, such as a river changing course or a flood tearing away soil. Not used in everyday conversation.
洪水による自然分離で、川沿いの土地の境界が変わった。
Due to avulsion caused by the flood, the boundary of the land along the river changed.
自然分離は、法律上、土地の所有権に影響を与えることがある。
Avulsion can affect land ownership under the law.
侵食 (erosion) is a gradual wearing away, while 自然分離 (avulsion) is a sudden, perceptible removal of land by water.
Compound of 自然 (natural) and 分離 (separation). The term is a direct translation of the English legal term 'avulsion'.