| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently survey the state and bottom quality of the water bottom, such as the river bottom or lake bottom as a plane and three-dimensionally and to reduce survey cost. SOLUTION: A rod body 2, constituting a water bottom survey rod 1, is constituted by detachably connecting a lower connecting rod 3 and an upper connecting rod 4 via a relay pipe 5. The outer surface of the rod body 2 is wound with a tape at the pitch of 10 cm from the tip, and depth-measuring graduation 6 is provided thereon over the whole length. A desired area is set to the water bottom to be surveyed, to erect measuring piles, and a survey rope is stretched on the river bottom to make underwater survey by a research diver. In parallel with this, the river bottom is searched with the water bottom survey rod 1 from a survey ship, or the water bottom survey rod 1 is put into the river bottom or the like, to survey the bottom quality three-dimensionally.</p> |
