PROBLEM TO BE SOLVED: To provide a thickness measuring apparatus for water-bottom earth and sand and a drift sand observation system which can measure the thickness of earth and sand accumulated on the bottom of the sea, rivers, lakes and marshes, dam lakes, or the like and the thickness of earth and sand reduced by erosion at all times regardless of weather.;SOLUTION: The measuring apparatus 1 for water-bottom earth and sand is an apparatus for measuring the thickness of earth and sand accumulated on the water-bottom. The measuring apparatus 1 comprises a fine-particle earth and sand pressure gauge 5 which is buried horizontally at a predetermined depth position from the bottom to measure pressure by fine-particle earth and sand in the earth and sand accumulated on the water-bottom and by water, a soil material pressure gauge 6 which is placed horizontally at a position which is the same depth position from the bottom as the fine-particle earth and sand pressure gauge 5 and is in the vicinity thereof to measure pressure by soil material earth and sand in the earth and sand accumulated on the water-bottom and by water, and a calculation apparatus 21 which calculates the thickness of the earth and sound accumulated on the water-bottom on the basis of the difference between a first output signal indicating the pressure measured by the fine-particle earth and sand pressure gauge 5 and a second output signal indicating the pressure measured by the soil material pressure gauge 6.;COPYRIGHT: (C)2008,JPO&INPIT
展开▼
