沈ちん泥でい

noun

silt; sedimentary mud

Refers to fine sediment deposited by water, often in rivers, lakes, or harbors. Used in geological, environmental, and engineering contexts.

• ダムの底そこには沈ちん泥でいが厚あつく堆たい積せきしている。

  A thick layer of silt has accumulated at the bottom of the dam.