FLOOD FLOW VELOCITY ESTIMATION METHOD USING MOVIES TAKEN BY RESIDENTS

Abstract

 Many researches on non-contact flow velocity measurement methods such as radio wave velocity meters and image analysis have been conducted as a method of measuring the flow velocity and flow rate. However, preliminary maintenance is indispensable, and diffusion has not advanced as it is being developed. In the rainstorm of the northern Kyushu in 2017, the intermediary mountainous area was damaged, the river surveillance camera and the water level gauge were not installed and the flow velocity was unclear. Therefore, we focused on motion pictures taken by residents and conducted a study to estimate the flow velocity.

 In this study, the flow velocity was estimated from the motion picture taken by the residents of the disaster area using two methods, the float method and the weir raised height. As a result, it was found that it is possible to estimate the flow velocity using moving pictures taken by residents. However, with regard to values such as falling distance, it is necessary to examine a method to obtain accurately and to increase the accuracy of the estimated value.