Inundation Characteristics in Arida City Due to Overtopping Waves Induced by 2018 Typhoon Jebi
This study investigated inundation characteristics at Minatomachi in Arida City, Wakayama Prefecture, Japan, induced by the 2018 Typhoon Jebi. Field surveys were first conducted to capture the inundation area and the inundation depths at a witnessed time. The survey results and interviews of local residents indicated that wave overtopping of the stormy waves, as well as the storm surge, contributed to the inundation. Three numerical simulations for estimating the surge, waves, and inundation were systematically combined to represent the observed inundation characteristics. The simulation result reasonably presented the observed inundation area with the depths and indicated that the wave overtopping was the primary factor for the inundation. The results also implied that infragravity waves, developed under the storm, might have a significant impact on the inundation.
Keywords:2018 Typhoon Jebi Inundation Overtopping waves Storm surge Infragravity waves
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We appreciate the anonymous residents who provided the pictures and the important information to us, Dr. Lianhui Wu and Mr. Yoshinao Matsuba who helped our field survey, and Mr. Naohiro Hattori who helped us to analyze simulated results. We have obtained the appropriate permissions for use of pictures of Figures 2(a) and (b) and also confirmed that no personal information is included in these pictures. The GSM-GPV data are originally provided by JMA. To access them, the archiving system of Oki/Kanae-Lab and Kitsuregawa-Lab, IIS, Univ. of Tokyo is used. Data accessible at http://dias.tkl.iis.u-tokyo.ac.jp/gpv/. The DIAS dataset is archived and provided under the framework of the Data Integration and Analysis System (DIAS) funded by Ministry of Education, Culture, Sports, Science and Technology (MEXT). Several figures presented in this paper were printed using the Generic Mapping Tools (GMT) software of Wessel et al. (2013). A part of this study was conducted as a research activity of “Enhancement of National Resilience against Natural Disasters,” Cross-ministerial Strategic Innovation Promotion Program (SIP), under supervision of NIED. The program was supported by Council for Science, Technology and Innovation (CSTI).
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