IDNDR SPECIAL PROJECT
C-3: Mechanics of Viscous Debris Flow and
Countermeasures for It
A peculiar viscous type debris flow is one of the major concerns with the investigators in the world who are involved in the debris flow research. This joint research between Japan(DPRI)and China(Chengdu Institute of Mountain Disaster and Environment, Academia Sinica) aims to make clear the mechanics of occurrence, flowage and deposition, the rainfall condition for initiation, prediction of the magnitude and the methods to cope with the destructive powers of the viscous type debris flow.
Five Japanese research members visited the Dongchuan Debris Flow Observation Station in August,1995 and carried out some field investigations: 1)They observed several debris flows and measured the intermittency, velocity and flowing characteristics. The important discovery in the flowage was nonexistence of the 'plug' which majority of theories assume that existence.2)They measured the river bed variation after passage of the debris flows.3)Japanese and Chinese members jointly generated several artificial debris flows in a small tributary of the Jiangjia gully and obtained data concerning the characteristics in flow and the properties of the materials.4)The surface soil infiltration test was done on the slope of the Da'aozi gully basin.5)They obtained the rainfall records that generated debris flows from the automatic recorder system that was deployed in the basin last year.
Two Chinese researchers from the Chengdu Institute will visit Japan in November to discuss on the results of these field works.
