The University of Tokyo Atacama Observatory 6.5m telescope: Permafrost hazards and the high-altitude infrastructures

Kenji Yoshikawa; Yuzuru Yoshii; Mamoru Doi; Takashi Miyata; Kotaro Kohno; Masuo Tanaka; Kentaro Motohara; Takeo Minezaki; Shigeyuki Sako; Tomoki Morokuma; Toshihiko Tanabe; Bunyo Hatsukade; Masahiro Konishi; Hidenori Takahashi; Takafumi Kamizuka; Hiroaki Sameshima; Natsuko Kato; Mizuki Numata; Tsutomu Aoki; Takao Soyano; Ken'ichi Tarusawa; Norbert Schorghofer; Gabriela Mena

doi:10.1117/12.2560813

13 December 2020 The University of Tokyo Atacama Observatory 6.5m telescope: Permafrost hazards and the high-altitude infrastructures

Kenji Yoshikawa, Yuzuru Yoshii, Mamoru Doi, Takashi Miyata, Kotaro Kohno, Masuo Tanaka, Kentaro Motohara, Takeo Minezaki, Shigeyuki Sako, Tomoki Morokuma, Toshihiko Tanabe, Bunyo Hatsukade, Masahiro Konishi, Hidenori Takahashi, Takafumi Kamizuka, Hiroaki Sameshima, Natsuko Kato, Mizuki Numata, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Norbert Schorghofer, Gabriela Mena

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 1144540 (2020) https://doi.org/10.1117/12.2560813
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Ice rich permafrost is observed at Chajnantor volcano (5,640m a.s.l.) on the University of Tokyo Atacama Observatory (TAO) site. Presence or absence of the permafrost is considered to be requested quite different engineering skills for their infrastructures. Lower altitude boundary is reported to be above 5,079m a.s.l. and maximum active (thawing) layer is 14cm. Minimal seasonal temperature variation, small active layer thickness as the consequences of low numbers of thawing and freezing degree days. Diurnal amplitude results in freeze-thaw cycles only near the surface. Severe frost shattering occurs near the ground surface, producing a dusty, fine-material horizon called a hyper-cryogenic layer. The importance of the snow-covered season for providing great protection for surface energy penetration. Many permafrost hazards are expecting in this construction site such as frost heaving, subsiding, mass movements, erosion, chemical weathering, frost shattering, embankment instability, and

Conference Presentation

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Kenji Yoshikawa, Yuzuru Yoshii, Mamoru Doi, Takashi Miyata, Kotaro Kohno, Masuo Tanaka, Kentaro Motohara, Takeo Minezaki, Shigeyuki Sako, Tomoki Morokuma, Toshihiko Tanabe, Bunyo Hatsukade, Masahiro Konishi, Hidenori Takahashi, Takafumi Kamizuka, Hiroaki Sameshima, Natsuko Kato, Mizuki Numata, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Norbert Schorghofer, and Gabriela Mena "The University of Tokyo Atacama Observatory 6.5m telescope: Permafrost hazards and the high-altitude infrastructures", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 1144540 (13 December 2020); https://doi.org/10.1117/12.2560813

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