Land Act Article 13

Where riparian land along lakes or waterways naturally accretes owing to the change of current, the owners of lands adjoining such accretions shall have the preferential right to acquire the ownership thereof, or to use them and enjoy incomes therefrom in accordance with Act.
中文原文 土地法第13條
湖澤及可通運之水道及岸地,如因水流變遷而自然增加時,其接連地之所有權人,有優先依法取得其所有權或使用受益之權。

English translation for reference only; the Chinese text prevails. Not legal advice.