TY - JOUR
T1 - Reconnaissance report on geotechnical damage caused by a localized torrential downpour with emergency warning level in Kyushu, Japan
AU - Mukunoki, Toshifumi
AU - Suetsugu, Daisuke
AU - Sako, Kazunari
AU - Murakami, Satoshi
AU - Fukubayashi, Yoshinori
AU - Ishikura, Ryohei
AU - Hino, Takenori
AU - Sugimoto, Satoshi
AU - Wakinaka, Kota
AU - Ito, Shinichi
AU - Koyama, Atsushi
N1 - Funding Information:
Geo-research team was financially supported by Construction Technology Research and Development Aid of Kyushu Construction Engineering Management Association. Authors appreciate the cooperation of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), and of Kumamoto prefecture's Department of Civil Engineering for their collaboration with the investigation team. Fig. 5(a), Fig. 6, Fig. 7(a), Fig. 8(a), Fig. 10(b), Fig. 14, Fig. 20(a) Fig. 21(b) and (c), Fig. 22(a) are contributed by their sincere efforts of Fukuoka, Nagasaki, Kumamoto, Miyazaki and Kagoshima Prefectures and so we, the authors, would like to express our deep appreciation to each of them. Fig. 2 is provided by MLIT National Land Numerical Information Download Service, <https://nlftp.mlit.go.jp/kokjo/inspect/inspect.html> (see 2020-09-13) (After downloading the GIS data, process the data with QGIS). Authors also appreciate Dr. Atsushi Sainoki, who is an Associate Professor of Kumamoto University, for his precious comments about rockfall with respect to Chapter 4. Authors also thank Dr. Ta, Ti, Hoai, who is a guest scholar visiting research fellow of Kumamoto University, for her sincere support to manuscript preparation.
Funding Information:
Geo-research team was financially supported by Construction Technology Research and Development Aid of Kyushu Construction Engineering Management Association. Authors appreciate the cooperation of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), and of Kumamoto prefecture’s Department of Civil Engineering for their collaboration with the investigation team. Fig. 5 (a), Fig. 6 , Fig. 7 (a), Fig. 8 (a), Fig. 10 (b), Fig. 14 , Fig. 20 (a) Fig. 21 (b) and (c), Fig. 22 (a) are contributed by their sincere efforts of Fukuoka, Nagasaki, Kumamoto, Miyazaki and Kagoshima Prefectures and so we, the authors, would like to express our deep appreciation to each of them. Fig. 2 is provided by MLIT National Land Numerical Information Download Service, (see 2020-09-13) (After downloading the GIS data, process the data with QGIS). Authors also appreciate Dr. Atsushi Sainoki, who is an Associate Professor of Kumamoto University, for his precious comments about rockfall with respect to Chapter 4. Authors also thank Dr. Ta, Ti, Hoai, who is a guest scholar visiting research fellow of Kumamoto University, for her sincere support to manuscript preparation.
Publisher Copyright:
© 2021
PY - 2021/4
Y1 - 2021/4
N2 - Kumamoto and Kogoshima prefectures are located in the southern Kyushu district of western Japan. In July 2020, a warm, humid air front triggered the delayed rains of the rainy season, resulting in torrential rains in many parts of Japan, especially in Kyushu. In particular, heavy downpours occurred in the southern Kyushu district on July 4th, causing severe damage to much of the infrastructure. Details could not be analyzed as usual because some branch office of local government were also damaged by floods. The spatial distribution of precipitation in the Kuma River basin, in the southern part of Kumamoto, was characterized by the uniformity of 400–500 mm on July 3rd and 4th. Finally, emergency warnings of torrential rain were issued for the southern Kumamoto and the northern Kagoshima Prefectures by Japan Meteorological Agency (JMA) at 4:50 a.m., July 4th, 2020. Then, the active rain front gradually shifted towards northern Kyushu. Again, torrential rain fell on northern Kyushu in the afternoon due to a stagnant rainy season front, and the JMA issued an emergency warning for a localized torrential downpour for parts of Fukuoka, Saga and Nagasaki prefectures at 4:30 pm. Gradually, the damage status involving geodisasters such as several types of slope failures, road subsidence, damage of the river levee was reported by local governments in each area where there had been emergency warnings. Based on the brief report of the pre-investigation team from the Kyushu branch of the Japan Geotechnical Society (JGS) in the first week after the disaster on July 4th, the geo-research teams investigated the following: 1) landslides; 2) damaged roads; 3) damaged river levees, and 4) any geotechnical infrastructures which were partially damaged and may be even more severely damaged by the next torrential rain. This reconnaissance report introduces the geological features in Kyushu, the analysis of precipitation distribution and geotechnical damages on the slope failures, road failures and river embankments based on reports obtained from July 4th to August 31st, 2020.
AB - Kumamoto and Kogoshima prefectures are located in the southern Kyushu district of western Japan. In July 2020, a warm, humid air front triggered the delayed rains of the rainy season, resulting in torrential rains in many parts of Japan, especially in Kyushu. In particular, heavy downpours occurred in the southern Kyushu district on July 4th, causing severe damage to much of the infrastructure. Details could not be analyzed as usual because some branch office of local government were also damaged by floods. The spatial distribution of precipitation in the Kuma River basin, in the southern part of Kumamoto, was characterized by the uniformity of 400–500 mm on July 3rd and 4th. Finally, emergency warnings of torrential rain were issued for the southern Kumamoto and the northern Kagoshima Prefectures by Japan Meteorological Agency (JMA) at 4:50 a.m., July 4th, 2020. Then, the active rain front gradually shifted towards northern Kyushu. Again, torrential rain fell on northern Kyushu in the afternoon due to a stagnant rainy season front, and the JMA issued an emergency warning for a localized torrential downpour for parts of Fukuoka, Saga and Nagasaki prefectures at 4:30 pm. Gradually, the damage status involving geodisasters such as several types of slope failures, road subsidence, damage of the river levee was reported by local governments in each area where there had been emergency warnings. Based on the brief report of the pre-investigation team from the Kyushu branch of the Japan Geotechnical Society (JGS) in the first week after the disaster on July 4th, the geo-research teams investigated the following: 1) landslides; 2) damaged roads; 3) damaged river levees, and 4) any geotechnical infrastructures which were partially damaged and may be even more severely damaged by the next torrential rain. This reconnaissance report introduces the geological features in Kyushu, the analysis of precipitation distribution and geotechnical damages on the slope failures, road failures and river embankments based on reports obtained from July 4th to August 31st, 2020.
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U2 - 10.1016/j.sandf.2021.01.008
DO - 10.1016/j.sandf.2021.01.008
M3 - Article
AN - SCOPUS:85101552830
SN - 0038-0806
VL - 61
SP - 600
EP - 620
JO - Soils and Foundations
JF - Soils and Foundations
IS - 2
ER -