This study examines the usability of unmanned aerial vehicle (UAV) data
surveyed just after an agricultural reservoir collapse by comparing the survey
results with the simulation results of the HEC-RAS (Hydrologic Engineering
Centers River Analysis System) flood wave propagation to the downstream
areas. A 61,400 m3 storage dam broken by 89.0 mm (over 30.0 mm/hr rainfall
intensity) of rainfall on August 21st, 2014 was considered. The reservoir water
capacity curve and downstream damaged areas were estimated by drone surveying
3 days after the dam break. The flood wave by the overtopped dam
break was propagated using the HEC-HMS (Hydrologic Engineering Centers
Hydrological Modeling System) reservoir inflow from the watershed. The
model results showed flood inundation depths of 0.1 to 2.2 m, mainly in rice
paddy areas along the stream, and the overtopped dam-break scenario exhibited
59% correspondence with the drone-surveyed areas.
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