TOPOGRAPHY CHANGE CONFIRMATION OF SEAWATER ROAD AND SUBSURFACE TOPOGRAPHY IMFORMATION UPDATE SYSTEM

摘要

PURPOSE: A topography change confirmation of an underwater road and a subsurface topography information update system are provided to find out an underwater detector even if connection between the underwater detector and a probe by including a floating gear and a sign. CONSTITUTION: In a device, a buoyancy member installation unit(112) includes a first holder(112a) which is formed in the inner wall while being opened upwardly. A first cover has a first protrusion interlinked with a first holder and opens a buoyancy member installation unit. A lamp installation unit(114) includes a second holder(114a) which is formed upwardly. A detector body(110) includes a second cover(115) interlinked with the second holder and has a second cover opening a lamp installation unit. The buoyant member(126) is arranged in the buoyancy member installation unit.