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Rockfall hazard assessment should be treated in a different way compared to other mass wasting phenomena due its complex nature. Rockfall hazard assessment involves determination of rockfall source, s...ize-frequency, onset susceptibility, temporal probability and deposit area. In this paper, we propose a methodological framework of rockfall hazard assessment which is expected to answer "where", "how frequent" and "how large" rockfall are likely to occur. Rockfall inventory and frequency-size analysis are employed to assess temporal distribution, size and frequency of rockfall which may occur in the future. GIS-lumped mass rockfall simulation is employed to identify potential rockfall source based on the distribution of boulders from the past rockfall events. And then, reliable trajectories are estimated once the potential rockfall sources are identified. It represents the rockfall susceptibility degree in the study area. Since GIS-lumped mass model does not consider the size, shape and fragmentation of the boulder, 2D DDA is employed to analyze the trajectory which has a potency of high risk, e.g. trajectory passing a building. Information of rockfall hazard represented as the susceptible location and magnitude-frequency, including temporal probability of rockfall can be further employed to formulate an appropriate landuse planning in a rockfall prone area.続きを見る
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paper2(74-2)