The Mississippi River, which used to sweep up dirt in one stretch of the delta only to deposit it in another, has now been channelled, for flood-prevention, to wash the land into the sea.

原本密西西比河冲刷三角洲一端松土的同时另一端沉积着，现在因为要预防洪水被改道了，因此会有陆地被河水冲走。

youdao

Flood-tide delta: accretionary deposit of sand found on the bay or river side of an inlet and usually formed by tidal currents.

UNESCO: L O S S A R Y