Fig. 3.
The panels present flow height behaviour over time at different barrier locations. Panel a shows F B 1 with flow front arrival followed by fluctuations reaching a peak flow depth of 250 millimetre, then gradually decreasing to near zero towards the end of debris flow. Panel b shows F B 2 with flow front arrival followed by an increase to a peak flow depth of 150 millimetre, then a gradual decrease over time. Panel c shows F B 3 with granular front arrival followed by a sharp rise and fluctuations reaching values up to about 550 millimetre, then decreasing gradually. Panel d shows F B 4 with granular front arrival followed by an increase to a peak flow depth of 140 millimetre, then a gradual decrease.Time histories of measured debris flow heights using laser sensors installed at (a) first, (b) second, (c) third and (d) fourth barrier locations