Estimation of External Forces Causing Flood Damage to the Namezu River, Nagano Prefecture, Japan, Caused by 2019 Typhoon Hagibis

DOI

Bibliographic Information

Other Title
  • 令和元年東日本台風による長野県滑津川水害の外力の推定

Abstract

Typhoon Hagibis in 2019 caused extensive damage throughout eastern Japan, especially the Chikuma River breaking its banks in Nagano Prefecture, which had a major socioeconomic impact. In addition, many small and medium-scale rivers were also inundated. However, hydrological data are scarce for many of these medium and small-scale rivers, making it difficult to accurately assess external forces. The purpose of this study is to estimate the actual conditions of flood damage caused by 2019 Typhoon Hagibis in the Namezu River, a right tributary of the Chikuma River, for which hydrological data were extremely scarce. Using limited hydrological data, the spatiotemporal changes in flood damage by comparing the results of numerical simulations by the RRI model coupled with iRIC Nays2DFlood model and damage surveys was clarified. In particular, we estimated that the maximum flow rate of the Namezu River was 478 m³/s by reproducing the actual inundation results in 2019 flood event.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390861803287254016
  • DOI
    10.24762/jndsj.42.s10_49
  • ISSN
    24341037
    02866021
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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