| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an earth and sand flow detection system that has a simple configuration, can early detect the generation of earth and sand flow, and can continuously monitor a generation state or a position. SOLUTION: A system is provided with a plurality of pipes 1 that are provided at specific intervals from the upstream to the downstream of a river A that becomes a subject while crossing the river A, two or more optical fibers 2a and 2b that are inserted into a plurality of pipes 1, a monitoring means 5 that monitors change in water temperature when earth and sand flow is generated, and measurement means 3 that measures strain distribution from the optical fibers 2a and 2b due to the deformation of the pipes 1 when the earth and sand flow is generated in the river A.</p> |
