IMPROVEMENT OF FLOOD RISK CURVE DEVELOPMENT BY CONSIDERING DEPENDENCE OF BASIN TOTAL RAINFALL ON ITS SPATIAL CONCENTRATION

• TANAKA Tomohiro

  京都大学大学院 地球環境学堂

• ICHIKAWA Yutaka

  京都大学大学院 工学研究科

• YOKOMATSU Muneta

  京都大学 防災研究所

• TACHIKAWA Yasuto

  京都大学大学院 工学研究科

Bibliographic Information

Other Title

• 一雨雨量と降雨の空間的集中度の関連を考慮した水害リスクカーブの推定精度向上

Abstract

 To derive flood risk curves considering spatiotemporal rainfall variability, frequency analysis of basin rainfall has been combined with thousands of normalized profiles of historical rainfall considering dependence of rainfall on duration. This study proposed to consider their further dependence on spatial concentration of profiles for deriving tributary flood risk curves. The scheme was applied to four major tributaries of the Yodo River basin, Japan. Comparing with a previous method, the proposed one better estimated flood frequencies at small tributaries (the Kamo and Katsura Rivers), keeping performance at large one (the Kizu River). Local flood risk curves were then derived around their confluence. Around the Kamo River, the proposed method showed better agreement in 100-year flood damage with reference data than the existing method. This study realized more reasonable estimation of the severity of flood risk and its spatial distribution.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 75 (1), 112-121, 2019

  Japan Society of Civil Engineers

Keywords

• flood damage probability map
• spatial rainfall variability
• flood risk assessment
• flood frequency analysis

Details

• CRID: 1390845702281246336
• NII Article ID: 130007709887
• DOI: 10.2208/jscejhe.75.112
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/75/1/75_112/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed