Landslide Hazards Induced by Heavy Rainfall in August 2021 in the Northern Part of the Aomori Prefecture, Japan

KON, Toshiyuki; Tsou, Ching-Ying; KOI, Takashi; Yamamoto, Yusuke; Koiwa, Naoto; Noda, Ryu; Irasawa, Michiya; KATO, Kiyokazu; TSUSHIMA, Hiroshi; Mori, Hiroshi; IWATA, Hideya; Sato, Tatsuya; Ikeda, Hajime; KUDO, Yushi; KOBAYASHI, Motoshiko; Arai, Ken‐ichi; KUROIWA, Chie; KOGA, Yuki; ISHIKAWA, Takeaki; TSUSHIMA, Misa; NAGANO, Eiji; Miura, Jun; SAITO, Haruka; KAWAKAMI, Reona

doi:10.13101/ijece.15.22

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…Some areas of the Shimokita Peninsula, Aomori Prefecture (Figure 1), experienced extremely heavy rainfall from the evening of 9 August to the morning of 10 August [1]. This heavy rainfall, hereafter Shimokita event, caused many landslides in Kazamaura Village and Mutsu City [2], resulting in traffic disruptions owing to collapsed bridges and damage to buildings.…”

Section: Introductionmentioning

confidence: 99%

Precipitation and Moisture Transport of the 2021 Shimokita Heavy Precipitation: A Transformed Extratropical Cyclone from Typhoon#9

Yatagai,

Saruta

2024

Atmosphere

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This study examines the heavy rainfall event that occurred in the Shimokita Peninsula, Japan, on 9–10 August 2021, resulting from an extra-tropical cyclone that developed from Typhoon#9 (EC9). The objective of this study is to elucidate the relationship between moisture transport and heavy rainfall and to verify the role of EC9. The authors created intensive hourly precipitation data over the Aomori Prefecture and analyzed them together with moisture fields. In most locations where the landslide disaster occurred, there were two precipitation peaks: at 9 UTC and 18 UTC on 9 August. The wind shear was strong from the lower to the upper troposphere with easterly winds in the lower troposphere and warm moist air from south for the first peak. A strong horizontal gradient of equivalent potential temperature, a northerly in lower troposphere, and moisture convergence over Shimokita Peninsula indicate the existence of the stationary front for the latter peak (18 UTC). The heavy precipitation and moisture convergence that caused the Shimokita event were identified by the stationary front of EC9 around the latter peak (15 UTC of 9th–06 UTC of 10 August). The precipitation distribution, which has a precipitation peak northeast of the EC center, is a typical typhoon-turned extratropical cyclone (EC) precipitation distribution.

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Section: Introductionmentioning

confidence: 99%

Precipitation and Moisture Transport of the 2021 Shimokita Heavy Precipitation: A Transformed Extratropical Cyclone from Typhoon#9

Yatagai,

Saruta

2024

Atmosphere

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Variation in the frequency and characteristics of landslides in response to changes in forest cover and rainfall in Japan over the last century: A literature review

Sato,

Shuin

2025

CATENA

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Effects of pore water and pore air pressure on the slope failure mechanisms due to rainfall in centrifuge investigation

Cho,

Sato,

Saito

et al. 2024

Geoenviron Disasters

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Background The slope failures triggered by heavy rainfall are challenging to predict. However, their severe impact and potential for extensive damage emphasize the urgent need for effective strategies to mitigate these risks. This study aimed to investigate the effects of pore water pressures (PWPs) and pore air pressures (PAPs) on slope failure during heavy rainfall under centrifuge condition. Three centrifuge rainfall model tests were conducted with varying rainfall intensities (I) and relative densities (Dr). In this experiment, the slope model was subjected to a centrifugal acceleration of 30 G. Results In all cases, slope failures started at the slope toes when the PWPs became positive and phreatic surfaces appeared on the slope surface. In the Toyoura sand case, the PAPs increased slightly at the slope crest, hardly changed at the slope toe, and oscillated at the slope shoulder due to rainwater infiltration. The entire slope failure was observed in this case. In the Silica sand cases, only localized slope toe failures were observed. The PAPs slightly oscillated with small changes in the silica sand case with a relative density of Dr = 50%. However, in the case with a Dr = 25%, the PAPs at the slope toe significantly increased compared to the other parts, and the oscillations were comparatively large. After the first failure occurred at the slope toe in the silica sand case with a Dr = 25%, cracks and slip lines appeared at the slope crest. Conclusions The three cases illustrated the complex relationship between soil properties, rainfall intensity, and the dynamics of pore water and pore air pressure on slope stability during heavy rainfall. From the behaviour of PAPs and PWPs in all cases, it was found that the transition from air to water occurred smoothly, and the isolation of air was not observed even during heavy rainfall. Changes in PAPs were far smaller than those in PWPs, indicating a smaller impact on slope stability than PWPs.

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Landslide Hazards Induced by Heavy Rainfall in August 2021 in the Northern Part of the Aomori Prefecture, Japan

Cited by 3 publications

References 1 publication

Precipitation and Moisture Transport of the 2021 Shimokita Heavy Precipitation: A Transformed Extratropical Cyclone from Typhoon#9

Precipitation and Moisture Transport of the 2021 Shimokita Heavy Precipitation: A Transformed Extratropical Cyclone from Typhoon#9

Variation in the frequency and characteristics of landslides in response to changes in forest cover and rainfall in Japan over the last century: A literature review

Effects of pore water and pore air pressure on the slope failure mechanisms due to rainfall in centrifuge investigation

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