STUDY ON MEASUREMENT OF EROSION-DEPOSITION PROCESS OF RESERVOIR SEDIMENT DURING FLUSHING OPERATION

Sedimentation management of reservoirs is one of crucial issues to realize sustainable development of water resources for the next generations. Recently, sediment-flushing techniques have been applied to Dashidaira dam and Unazuki dam in the Kurobe River, but erosion-deposition process of sediment in reservoirs and its effect on success or failure of flushing operation have been rarely discussed. This paper studies how to measure actual sediment erosion-deposition process during flushing operations. A field measurement with 3D Laser scanner in Unazuki dam reservoir shows that 3D Laser scanner can be applicable to measure both water and sediment profiles and those temporal changes.