TY - JOUR
T1 - Physical modeling of tsunamis generated by subaerial, partially submerged, and submarine landslides
AU - Takabatake, Tomoyuki
AU - Mäll, Martin
AU - Han, Dawn Chenxi
AU - Inagaki, Naoto
AU - Kisizaki, Daichi
AU - Esteban, Miguel
AU - Shibayama, Tomoya
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science [JP19K15104]; Japan Science and Technology Agency [JPMJJR1801]; Japan Society for the Promotion of Science [JP20J14032]. The present work was supported by JSPS KAKENHI Grant Number JP19K15104 and JST, J-RAPID Grant Number JPMJJR1801. The research activities of the second author were supported by the JSPS KAKENHI Grant in-Aid for Research Fellows (JP20J14032). The work was performed as a part of activities of Research Institute of Sustainable Future Society, Waseda Research Institute for Science and Engineering, Waseda University. The authors would also like to kindly acknowledge the input of several anonymous reviewers, whose comments helped to greatly enhance the quality of the manuscript.
Funding Information:
The present work was supported by JSPS KAKENHI Grant Number JP19K15104 and JST, J-RAPID Grant Number JPMJJR1801. The research activities of the second author were supported by the JSPS KAKENHI Grant in-Aid for Research Fellows (JP20J14032). The work was performed as a part of activities of Research Institute of Sustainable Future Society, Waseda Research Institute for Science and Engineering, Waseda University. The authors would also like to kindly acknowledge the input of several anonymous reviewers, whose comments helped to greatly enhance the quality of the manuscript.
Publisher Copyright:
© 2020 Japan Society of Civil Engineers.
PY - 2020/12
Y1 - 2020/12
N2 - In the present study, three different types of landslide-generated tsunamis (subaerial, partially submerged and submarine) were investigated through laboratory experiments that used 261 different experimental conditions. The results show that, for the near-field region, the subaerial landslide generated a higher leading wave, while the submarine landslide generated a higher second wave. However, frequency dispersion considerably influenced their propagation, with the leading wave decaying and the trailing waves being enhanced. The present study also revealed that the leading wave has higher values for wave celerity, period, and length than the second wave, regardless of landslide type. It was also shown that the celerity of the leading wave and second wave can be approximated by the solitary wave theory and third-order Stokes theory, respectively. Using the extensive experimental dataset obtained, predictive equations to estimate the maximum crest amplitudes generated by partially submerged and submarine landslides were also developed. A comparison with the experiments of previous researchers and field survey data from the 2018 Palu Tsunami indicated that these equations can estimate reasonably well the height of the generated tsunami. It was also shown that the relative mass and initial position of the landslide are influential nondimensional parameters to determine the tsunami amplitudes generated.
AB - In the present study, three different types of landslide-generated tsunamis (subaerial, partially submerged and submarine) were investigated through laboratory experiments that used 261 different experimental conditions. The results show that, for the near-field region, the subaerial landslide generated a higher leading wave, while the submarine landslide generated a higher second wave. However, frequency dispersion considerably influenced their propagation, with the leading wave decaying and the trailing waves being enhanced. The present study also revealed that the leading wave has higher values for wave celerity, period, and length than the second wave, regardless of landslide type. It was also shown that the celerity of the leading wave and second wave can be approximated by the solitary wave theory and third-order Stokes theory, respectively. Using the extensive experimental dataset obtained, predictive equations to estimate the maximum crest amplitudes generated by partially submerged and submarine landslides were also developed. A comparison with the experiments of previous researchers and field survey data from the 2018 Palu Tsunami indicated that these equations can estimate reasonably well the height of the generated tsunami. It was also shown that the relative mass and initial position of the landslide are influential nondimensional parameters to determine the tsunami amplitudes generated.
KW - 2018 Palu Tsunami
KW - Tsunamis
KW - landslides
KW - physical model
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U2 - 10.1080/21664250.2020.1824329
DO - 10.1080/21664250.2020.1824329
M3 - Article
AN - SCOPUS:85092157333
SN - 0578-5634
VL - 62
SP - 582
EP - 601
JO - Coastal Engineering in Japan
JF - Coastal Engineering in Japan
IS - 4
ER -