2022年台風15号による静岡県中部巴川下流域の河川氾濫

DOI

書誌事項

タイトル別名
  • Flooding in the Lower Basin of the Tomoe River, Central Shizuoka Prefecture, Japan, caused by Typhoon 15 in 2022 based on field survey and terrain analysis using aerial LiDAR point cloud
  • ―現地調査と航空レーザー計測点群による分析―

抄録

Based on field surveys and terrain analysis using open data of aerial LiDAR point cloud (VIRTUAL SHIZUOKA), we analyzed the characteristics and causes of flooding in the lower basin of the Tomoe River caused by the heavy rains associated with Typhoon 15 in 2022. The water level of the main river was diverted into the Oya drainage channel and dropped once, but the level rose again and overflowed where the tributaries merged. The levee itself was not damaged or breached. Tributaries that had not undergone sufficient river improvement, and thus still had many meanders and shallow channels, flooded significantly, while tributaries that had undergone advanced river improvement also flooded due to increased water levels before joining the main river. Tributaries often overflowed in front of the insufficient cross-sectional area of the river channel where they passed under roads and railroads. Comparison of the flood depth distribution with existing hazard maps showed that the main channel flooding was generally on the planned scale. Some of the tributary flooding corresponded to the assumed maximum magnitude, while others fell far short of it. The high resolution of the topographical map based on point cloud data is considered effective for understanding flood risk and raising public awareness because it realistically reconstructs the flooded urban landscape.

収録刊行物

詳細情報 詳細情報について

  • CRID
    1390015564796593408
  • DOI
    10.51053/shizuoka.50.0_115
  • ISSN
    24367184
    03886298
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
  • 抄録ライセンスフラグ
    使用不可

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