Citation

Tanaka K. J. Jpn. Soc. Nat. Disaster Sci. 2020; 38(4): 433-447.

Copyright

(Copyright © 2020, Japan Society for Natural Disaster Science)

DOI

10.24762/jndsj.38.4_433

PMID

unavailable

Abstract

The large amplified secondary oscillation, locally called abiki, observed in Kyushu and San-in coastal area on 20 and 21 March 2019 as passed the extratropical cyclone. This paper reports on the inundation damages by abiki phenomenon over the urban area of Nagasaki. According to field survey, the water level as high as 2.3~2.6 m above Tokyo Peil (T.P.) in the downtown of Nagasaki, and 2.9 m T.P. in the downstream site of Urakami River. There seemed to be two-staged mechanisms of inundation in Nagasaki city: the backward flow through the culverts in the first stage, and the overflow from small rivers in the second stage.

Language: en

Keywords

inundation; meteorological tsunami; Nagasaki bay; river-runup; secondary oscillation; 気象津波; 浸水; 潮位副振動; 遡上; 長崎湾