Evaluation of landslide disaster risk using locally measured rainfall data and its use for early evaluation of resident people in Takasu-cho, Fukui

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  • 福井市高須町における局所雨量観測データを用いた土砂災害発生危険度評価およびその住民の早期避難に向けた利活用に関する検討

Abstract

<p>The authors introduced our own weather station in Takasu-cho, Fukui city from July, 2015 and have measured local rainfall continuously to analyze the landslide risk. After evaluating the landslide risk based on locally measured rainfall data, the landslide risk in Takasu-cho has increased significantly during the "Heavy rains of July 2018 (heavy rain in western Japan)", "Heavy rain of July 29, 2021" and “Heavy rain from August 4th to 5th, 2022”. While the “heavy rain of July 2018” was relatively heavy and lasted for a long time, the “heavy rain of July 29, 2021” and “Heavy rain from August 4th to 5th, 2022” are a typical case for localized torrential rainfall in a short period of time. In this paper, the landslide risks were evaluated by plotting snake curves based on locally measured rainfall data for these two completely different types of rainfall. In addition, the methodology to initiate and take early warning/evacuation actions (drive "evacuation switch" and "my timeline"). using not only disaster prevention weather information and evacuation information announced by the government but also landslide risk evaluated by locally measured rainfall data was investigated in detail. </p>

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