In Miyazaki Prefecture, slope failure disaster and flood disaster occurred due to the heavy rain accompanying the passage of typhoon 0514 early in September 2005, causing great damage. In the area of Mt. Wanitsuka (1,118m), which is about 20km southwest of Miyazaki City, the total rainfall from September 3rd to the 6th reached 1,013mm, resulting in large-scale slope failure particularly in the northern slope; debris flows occurred in the upstream area of the Kiyotake River, and a lot of earth and sand deposited in the lower stream of the river. There were two types of slope failure, collapse and landslides. In the upstream area of the Hiroto River in Kitago Town, large-scale slope failure occurred, which led to the formation of a natural dam.
TheKumamotoearthquakeMj7.3 (Mw7.0) occurredonApril16,2016,centeredintheKumamotoarea,andlargescale of slope collapse broke out in the Aso Ohashi bridge area. In this slope collapse site, damages to any roads and railwayswereintense,furthermore,therewasconcernthatafurtherslopecollapsecouldoccurbyrepeatedaftershock. Therefore,itwasrequiredthattheinvestigationandconstructionwerecarriedoutswiftlywhileensuringsafety.Atthis time,intheareaofacollapsedslopewherepeoplecouldnotenter,aeriallasermeasurementstocontributetothesurvey designalongwithphotogrammetryandmeasurementsbyanUAVinaccordancewiththeprogressofconstructionhave beenconducted,aswellasfurthersurfaceexplorationutilizingtheaboveresults,bedrockstabilityevaluationsandsoon havebeenrealized.Also,thedesignofthesizeandtheshapeforthelandretainingembankment,andalsotheexcavation rangefortheearthremovalworkofthetopofslopeonthebasisofthethree-dimensionaldatathatwasmadebasedon surveyresultsandgeologicalreconnaissance.Thesepreventionworkscarriedoutsafelybyunmannedmachinery,while monitoring the slopes by the field observation under the construction. These series of investigation, design and constructionwereconductedwithusingtheICT (InformationandCommunicationTechnology) .
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