5:15 PM - 5:30 PM
[HTT30-04] Monitoring the sediment movement in deep-seated landslides in Nara Prefecture utilizing UAV
Keywords:UAV, Monitoring, Measurement, Deep landslinde, Sediment disaster
The field survey was carried out on the 11th and 12th of November, 2014. Flight speed was set between 20 and 45km/h. The longest flight with automatic navigation was about 14km (one way 7km). The flight of UAV with rotary wings in steep terrain may be the first trial in the world. We have investigated both of the photographs taken by the UAV and the ones by airplanes or helicopters in the previous research, and detected the change of terrain and vegetation. We also calculated with deference analysis the amount of the sediment movement on the slope where measurement data of laser survey were obtained immediately after the landslide. As the result we could detect the change of the followings,
-Topographic change of terrain such as erosion of cliff, flow channel of small rivers, development of gully.
-Change of vegetation such as outflow of fallen trees and elimination of woods.
-Amount of sediment erosion at the lower part of the landslide within one or two year.