head of navigation

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

(nautical) The farthest point above the mouth of a river that can be navigated by ships. This term can be somewhat subjective on many streams, as this point may vary greatly with the size of the ship being contemplated for navigation. On others it is quite objective, being caused by a waterfall, dam or lock.

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During the dry season, the head of navigation on the river moved several miles downstream, preventing larger barges from reaching the town.

詳細

意味（1）

(nautical) The farthest point above the mouth of a river that can be navigated by ships. This term can be somewhat subjective on many streams, as this point may vary greatly with the size of the ship being contemplated for navigation. On others it is quite objective, being caused by a waterfall, dam or lock.