Abstract
It is a very important subject for our country to survey physical processes of rocky mudflow causing serious damages in mountaineous regions. In order to carry out an systematic and exact observation on moving state of rocky mudflow, a new synthetic observation system was developed by Mudflow Research Group.
The system consists of velocity sensors connected with time recorder for the measurement of local variation of front velocity and 8 mm cine cameras, 16 mm cine camera, 35 mm constant interval shot camera, video camera and stereo cameras, which are ready for automatic recording of moving pattern and form of mudflow.
In addition to the system, rain gauges and mud samplers were set in the same observation area to study water balance and physical property of flowing substance.
After a preliminary test in 1970, a field test of the whole system was carried on in 1971 at Valley Kamihori on eastern slope of Mt. Yake, North Japan Alps.
In the morning on 6 th, Sept. 1971, our new system succeeded in recording the motion of rocky mudflow several times, and valuable information about mudflow was got in relation to hydrological and microtopographical conditions.
A general explanation on the observation system and a part of the results obtained from field test in 1971 are described in this paper.
