| 摘要 |
PROBLEM TO BE SOLVED: To provide a river bed drop measuring apparatus for a liquefaction line capable of managing data to establish a foresight or a prediction of a disaster scale occurring due to a drop of the river bed by measuring a drop amount of the river bed in the liquefaction line and an evaluation technique for a landside prevention facility. SOLUTION: In the liquefaction line of an entire region in which earth and sand movement from a mountain-side slope A of an uppermost stream of a river to a drift sand area of a coast B, the entire region is divided into three sections of the mountain-side slope A, a mountain stream.dam C and a river channel D. The river bed drop measuring apparatus 9 provided in the river channel D comprises a sensor 19 containing a small-sized radio oscillator 33 embedded in the river bed of the river channel D, a receiver 25 for receiving the radio wave oscillated from the sensor 19 through an antenna 23, and a reception recorder 27 for recording a receiving state received by the receiver 25. |
