Ice Jam An accumulation of broken river ice or sea ice not moving due to some physical restriction and resisting to pressure. 얼음 용골 얼음 캐노피 아래쪽의 아래쪽으로 돌출된 능선으로, 물에 잠긴 능선의 대응 부분입니다. Ice keels may extend as much as m below the surface.