English Dictionary

head of navigation

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.

日本語の意味

河川で船舶が航行可能な上流端、すなわち船の大きさによって変動する可能性があるが、通常は滝、ダム、船渠などによって航行が制限される地点を意味する。

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

乾季には、川の航行可能な最上点が数マイル下流へ移動し、大型のはしけが町まで到達できなくなった。

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.