Measurement of Surface Velocity of Debris Flows by Spatial Filtering Velocimetry

Abstract

The spatial filtering velocimetry is a useful non-contact method to measure the surface velocity of debris flow which has a terribly destructive power. The maximum entropy method one of spectrum analysis, was available for extracting the central frequency of the output electrical signal of the sensor and was able to make clear the trends and the fluctuations of the surface velocity of debris flows.