This is the 5649th most frequent Japanese word.
しゅんせつ
Dredging.
しゅんせつ (浚渫) refers here to the act or process of clearing sediment from the riverbed.
川の浚渫が必要です。
Dredging the river is necessary.
しゅんせつ (浚渫) describes the specific activity of dredging carried out using equipment like ships.
浚渫作業は船を使って進行します。
The dredging work progresses using ships.
しゅんせつ (浚渫) in this sentence highlights the planning aspect of dredging, especially its environmental implications.