When a large scale sediment-related disaster occurs, it is imperative to take quick action to prevent the disaster from expanding, such as the evacuation of residents in the area and emergency restoration of the desaster site. In order to examine concrete measures, it is necessary to have a detailed grasp of conditions at the disaster site.
Up until now information has been collected through field investigation and observation from the ground. However, when a large-scale disaster occurs, since it is difficult to carry out an investigation over an extended area in a short period, and the approach to the disaster site is often limited immediately after a sisaster, there are limitations on information gathered from the ground soon after a disaster. Investigation from a helicopter has advantages such that it is possible to observe an extended disaster site in a short period and that it is also possible to collect information at the site where no surface access is available. On the other hand, because of the limitations in data accuracy due to types and functions of sensors, a helicopter investigation seems to present difficulties in grasping any portentous symptoms which could indicate a secondary disaster.
Therefore, in order to make it possible to collect information quickly and efficiently using a helicopter at the time of a sediment-related disaster, helicopter sensors and the contents for the investigation from the air were examined. Measures to get information on sediment-related disaster using a helicopter were reviewed also by interpreting past video films and conducting mock investigations on a disaster site using a helicopter.
View full abstract