Debris Flow disasters
Debris Flow disasters : Occur frequently in recent years. A volcanic disaster extends over a wide range of areas involving a loss of lives and properties. As a preventive measures, it is necessary to take comprehensive volcanic disaster prevention measures including non-structural preventive measures like establishment of a warning and evacuation system as well as structural preventive measures like the construction of sabo dams and other facilities. Structural Measures: In structural measures, various sabo facilities are installed to minimize damages by volcanic mudflow, pyroclastic flow and lave flow as well as sediment-related disasters caused by rainfall. Major volcanic disaster prevention facilities include "energy dissipator" for checking the flow of volcanic products, "training dike works" for guiding mud flow and lava flow to safe zones and "permeable-type sabo dam" for preventing large rocks from rolling down and "sand pocket works" for allowing mudflow to accumulate. Non-Structural Measures: In order to mitigate and prevent sediment-related disasters associated with volcanic activities, it is important to establish non-structural measures such as a warning and evacuation system in parallel with structural measures. Various preparations are made, such as those for hazard maps based on a simulation of volcanic hazards and information systems which can quickly grasp information on volcanic activities by installing monitor cameras or other sensors
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