Publications

Selected publications

• Hydrological amplification and landscape-resetting sediment pulses: A 45-year baseline evaluation of the 2025 Mataian River landslide-dam event, TaiwanJui-Yi Ho, Che-Hsin Liu, Pei-Chi Chen, Shih‑Chiang Lee, Chih-Hsin Chang, Naoki Sakai, Yi-Chin Chen, Chen-Yu Chen, Hung-Po Huang, Hongey Chen. Journal of Hydrology: Regional Studies, 67, 103857 (2026).
• DEBRIS FLOW DETECTION USING REMOTE GROUND VIBRATION RECORDING BASED ON EXPERIMENTAL DATAIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Journal of JSCE, 81(15) (2025).
• Experimental Research on Rain-Induced Landslide Mechanism Using Large-Scale Rainfall Experimental Facility: Findings and ChallengesNaoki Sakai, Tomohiro Ishizawa, Toru Danjo. Progress in Landslide Research and Technology, Springer, 3(2), 173–195 (2025).
• Machine Learning Reveals the Contrasting Roles of Rainfall and Canopy Structure Metrics on the Formation of Canopy Drip and Splash ThroughfallKazuki Nanko, Delphis F. Levia, Shin'ichi Iida, Yoshinori Shinohara, Naoki Sakai. Journal of Geophysical Research: Biogeosciences (2025).
• River rejuvenation on a fluvial fan induced by typhoons and earthquakesJui-Yi Ho, Wei-Lin Lee, Che-Hsin Liu, Naoki Sakai, Yi-Chin Chen, Chih-Hsin Chang, Hongey Chen. npj Natural Hazards, 2(48), 1–9 (2025).
• Using unmanned aerial vehicle monitoring for the landslide and dammed lake: a case study of the Xiuluan area in TaiwanChe-Hsin Liu, Jui-Yi Ho, Horn-Ru Liao, Shih-Chiang Lee, Naoki Sakai, Chen-Yu Chen, Chih-Hsin Chang. Bulletin of Engineering Geology and the Environment, 84(6) (2025).
• Geophysical exploration from space and the air (Remote sensing and drone geophysical surveys)In JapaneseTakeshi Yoshikawa, Shuichi Rokugawa, Naoki Sakai, Naruo Mushiake, Wataru Takeshita. BUTSURI-TANSA(Geophysical Exploration), 77, 26–31 (2024).
• Impact of Rainfall on the Detection Performance of Non-Contact Safety Sensors for UAVs/UGVsYasushi Sumi, Bong Keun Kim, Takuya Ogure, Masato Kodama, Naoki SAKAI, Masami Kobayashi. Sensors, 24(9), 1–19 (2024).
• 土石流の流入によるため池貯水時の堤体への作用荷重の評価In Japanese正田 大輔, 吉迫 宏, 井上 敬資, 小嶋 創, 酒井 直樹. 農業農村工学会論文集, 92(1), I_41–I_50 (2024).
• Basic study on the ground vibration measurements in debris flow experimentsIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Geotechnical Journal, 18(1), 43–58 (2023).
• Experimental investigation of ground vibration characteristics due to debris flow under rainfall conditionsIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Geotechnical Journal, 18(4), 407–420 (2023).
• Millennial-scale coseismic landslide history inferred from topographic and stratigraphic features of a post-caldera cone of Aso Volcano in southwestern JapanTakashi Kimura, Naoki Sakai, Yoshiro Tanaka, Ken Nagakura, Kazuhiko Matsuya. Geomorphology, 422 (2023).
• 災害時にも使えるフェーズフリーな衛星データの利活用In Japanese酒井 直樹, 田口 仁, 六川 修一. AI・データサイエンス論文集（土木学会構造工学委員会）, 4(L1), 9–18 (2023).
• Urban waterlogging mitigation based on the concept of sponge cityChenrui Xi, Naoki Sakai. Malaysia-Japan Joint International Conference 2022 (MJJIC 2022), Kuala Lumpur, Malaysia (2022).
• Canopy Structure Metrics Governing Stemflow Funneling Differ between Leafed and Leafless States: Insights from a Large‐scale Rainfall SimulatorShin'ichi Iida, Kathryn I. Wheeler, Kazuki Nanko, Yoshinori Shinohara, Xinchao Sun, Naoki Sakai, Delphis F. Levia. Hydrological Processes, 35(8) (2021).
• Development of Satellite Remote Sensing Data and Geo-spatial Data Platform for Disaster ManagementIn Japanese六川修一, 六川修一, 田口仁, 酒井直樹. 日本リモートセンシング学会誌, 40(3), 147–152 (2020).
• Development of satellite remote sensing data and Geo-spatial data platform for disaster managementIn Japanese田口仁, 酒井直樹, 臼田裕一郎. 写真測量とリモートセンシング, 59(1), 10–13 (2020).
• What Factors Contributed to the Torrential Rainfall of Hurricane Harvey over Texas?Satoshi Iizuka, Naoki Sakai. Journal of Disaster Research, 15(6), 726–734 (2020).

All publications

2026

• Hydrological amplification and landscape-resetting sediment pulses: A 45-year baseline evaluation of the 2025 Mataian River landslide-dam event, TaiwanJui-Yi Ho, Che-Hsin Liu, Pei-Chi Chen, Shih‑Chiang Lee, Chih-Hsin Chang, Naoki Sakai, Yi-Chin Chen, Chen-Yu Chen, Hung-Po Huang, Hongey Chen. Journal of Hydrology: Regional Studies, 67, 103857.

2025

• DEBRIS FLOW DETECTION USING REMOTE GROUND VIBRATION RECORDING BASED ON EXPERIMENTAL DATAIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Journal of JSCE, 81(15).
• Experimental Research on Rain-Induced Landslide Mechanism Using Large-Scale Rainfall Experimental Facility: Findings and ChallengesNaoki Sakai, Tomohiro Ishizawa, Toru Danjo. Progress in Landslide Research and Technology, Springer, 3(2), 173–195.
• Machine Learning Reveals the Contrasting Roles of Rainfall and Canopy Structure Metrics on the Formation of Canopy Drip and Splash ThroughfallKazuki Nanko, Delphis F. Levia, Shin'ichi Iida, Yoshinori Shinohara, Naoki Sakai. Journal of Geophysical Research: Biogeosciences.
• River rejuvenation on a fluvial fan induced by typhoons and earthquakesJui-Yi Ho, Wei-Lin Lee, Che-Hsin Liu, Naoki Sakai, Yi-Chin Chen, Chih-Hsin Chang, Hongey Chen. npj Natural Hazards, 2(48), 1–9.
• Using unmanned aerial vehicle monitoring for the landslide and dammed lake: a case study of the Xiuluan area in TaiwanChe-Hsin Liu, Jui-Yi Ho, Horn-Ru Liao, Shih-Chiang Lee, Naoki Sakai, Chen-Yu Chen, Chih-Hsin Chang. Bulletin of Engineering Geology and the Environment, 84(6).

2024

• Geophysical exploration from space and the air (Remote sensing and drone geophysical surveys)In JapaneseTakeshi Yoshikawa, Shuichi Rokugawa, Naoki Sakai, Naruo Mushiake, Wataru Takeshita. BUTSURI-TANSA(Geophysical Exploration), 77, 26–31.
• Impact of Rainfall on the Detection Performance of Non-Contact Safety Sensors for UAVs/UGVsYasushi Sumi, Bong Keun Kim, Takuya Ogure, Masato Kodama, Naoki SAKAI, Masami Kobayashi. Sensors, 24(9), 1–19.
• 土石流の流入によるため池貯水時の堤体への作用荷重の評価In Japanese正田 大輔, 吉迫 宏, 井上 敬資, 小嶋 創, 酒井 直樹. 農業農村工学会論文集, 92(1), I_41–I_50.

2023

• Basic study on the ground vibration measurements in debris flow experimentsIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Geotechnical Journal, 18(1), 43–58.
• Experimental investigation of ground vibration characteristics due to debris flow under rainfall conditionsIn JapaneseTetsushi KURITA, Takashi KITAZUME, Naoki SAKAI, Shinichi YAMANOBE. Japanese Geotechnical Journal, 18(4), 407–420.
• Millennial-scale coseismic landslide history inferred from topographic and stratigraphic features of a post-caldera cone of Aso Volcano in southwestern JapanTakashi Kimura, Naoki Sakai, Yoshiro Tanaka, Ken Nagakura, Kazuhiko Matsuya. Geomorphology, 422.
• 災害時にも使えるフェーズフリーな衛星データの利活用In Japanese酒井 直樹, 田口 仁, 六川 修一. AI・データサイエンス論文集（土木学会構造工学委員会）, 4(L1), 9–18.

2022

• Urban waterlogging mitigation based on the concept of sponge cityChenrui Xi, Naoki Sakai. Malaysia-Japan Joint International Conference 2022 (MJJIC 2022), Kuala Lumpur, Malaysia.

2021

• Canopy Structure Metrics Governing Stemflow Funneling Differ between Leafed and Leafless States: Insights from a Large‐scale Rainfall SimulatorShin'ichi Iida, Kathryn I. Wheeler, Kazuki Nanko, Yoshinori Shinohara, Xinchao Sun, Naoki Sakai, Delphis F. Levia. Hydrological Processes, 35(8).

2020

• Development of Satellite Remote Sensing Data and Geo-spatial Data Platform for Disaster ManagementIn Japanese六川修一, 六川修一, 田口仁, 酒井直樹. 日本リモートセンシング学会誌, 40(3), 147–152.
• Development of satellite remote sensing data and Geo-spatial data platform for disaster managementIn Japanese田口仁, 酒井直樹, 臼田裕一郎. 写真測量とリモートセンシング, 59(1), 10–13.
• What Factors Contributed to the Torrential Rainfall of Hurricane Harvey over Texas?Satoshi Iizuka, Naoki Sakai. Journal of Disaster Research, 15(6), 726–734.

2019

• Throughfall partitioning by treesDelphis F. Levia, Kazuki Nanko, Hiromasa Amasaki, Thomas W. Giambelluca, Norifumi Hotta, Shin'ichi Iida, Ryan G. Mudd, Michael A. Nullet, Naoki Sakai, Yoshinori Shinohara, Xinchao Sun, Masakazu Suzuki, Nobuaki Tanaka, Chatchai Tantasirin, Kozo Yamada. HYDROLOGICAL PROCESSES, 33(12), 1698–1708.

2018

• Application of RFID to Soil-Erosion ResearchAnthony Parsons, James Cooper, Yuichi Onda, Naoki Sakai. APPLIED SCIENCES-BASEL, 8(12).
• Gaps between the transmission and reception of information on rainfall amountsKan Shimazaki, Hiroko Nakajima, Naoki Sakai, Akiko Miyajima. Journal of Disaster Research, 13(5), 879–885.

2017

• Modelling time-lapse shear-wave velocity changes in an unsaturated soil embankment due to water infiltration and drainageAtsushi Suzaki, Shohei Minato, Ranajit Ghose, Chisato Konishi, Naoki Sakai. First Break, 35(8), 81–90.
• Real-Time Prediction Method for Slope Failure Caused by Rainfall Using Slope Monitoring RecordsTomohiro Ishizawa, Toru Danjo, Naoki Sakai. JOURNAL OF DISASTER RESEARCH, 12(5), 980–992.
• Shear and compression strain development in sandy model slope under repeated rainfallKatsuo Sasahara, Naoki Sakai. Soils and Foundations, 57(6), 920–934.

2016

• Analysis of Shear Zones of Landslides by the Numerical Simulation of Monitored Surficial Displacement Vectors - Case Study of the Landslide at Gunung Pass, MalaysiaSenro Kuraoka, Naoki Sakai, Mohamad Nazri, Suhaimi Jamaludin, Che Hassandi Abdullah. Geotechnical Special Publication, 2016-January(269 GSP), 518–529.
• Mechanism of two rapid and long-runout landslides in the 16 April 2016 Kumamoto earthquake using a ring-shear apparatus and computer simulation (LS-RAPID)Khang Dang, Kyoji Sassa, Hiroshi Fukuoka, Naoki Sakai, Yuji Sato, Kaoru Takara, Lam Huu Quang, Doan Huy Loi, Pham Van Tien, Nguyen Duc Ha. LANDSLIDES, 13(6), 1525–1534.

2015

• Monitoring of the Shear and Compression Deformation in a Sandy Model Slope Under Artificial RainfallKatsuo Sasahara, Naoki Sakai, Kazuya Itoh. ENGINEERING GEOLOGY FOR SOCIETY AND TERRITORY, VOL 2: LANDSLIDE PROCESSES, 1481–1484.
• S-wave velocity monitoring during an artificial rainfall experiment using large scale rainfall simulatorC. Konishi, T. Ishizawa, T. Danjo, N. Sakai. Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics, 135–139.
• Temporal changes of soil temperature with soil water content in an embankment slope during controlled artificial rainfall experimentsMayumi Yoshioka, Shinichi Takakura, Tomohiro Ishizawa, Naoki Sakai. Journal of Applied Geophysics, 114, 134–145.

2014

• Development of Historical Landslide Database in Peninsular MalaysiaSatoshi Murakami, Tomomi Nishigaya, Naoki Sakai, Tay Lea Tien, Habibah Lateh, Nazirah Azizat. 2014 IEEE 2ND INTERNATIONAL SYMPOSIUM ON TELECOMMUNICATION TECHNOLOGIES (ISTT), 149–153.
• Development of shear deformation due to the increase of pore pressure in a sandy model slope during rainfallKatsuo Sasahara, Naoki Sakai. Engineering Geology, 170, 43–51.
• Hazard mapping of Slope Disasters in Peninsular Malaysia by using a Historical Map of Slope DisastersTomomi Nishigaya, Satoshi Murakmi, Naoki Sakai. 2014 IEEE 2ND INTERNATIONAL SYMPOSIUM ON TELECOMMUNICATION TECHNOLOGIES (ISTT), 241–244.
• Laser scanner application in monitoring short-term slope deformationKiminori Araiba, Naoki Sakai. Landslide Science for a Safer Geoenvironment: Volume 2: Methods of Landslide Studies, 5–11.
• Prediction method of the onset of landslides based on the Stress-Dilatancy relation against shallow landslidesKatsuo Sasahara, Kazuya Itoh, Naoki Sakai. Landslide Science for a Safer Geoenvironment, 1, 315–320.

2013

• Effectiveness of underground displacement measurement using inclinometer for prediction of slope failureIn Japanese石澤友浩, 酒井直樹, 諸星敏一, 福囿輝旗. 日本地すべり学会誌, 50(6), 256–267.
• Monitoring system for slope stability under rainfall by using MEMS acceleration sensor IC tagsS. Murakami, A. Dairaku, H. Komine, N. Sakai, T. Isizawa, O. Saito, I. Maruyama. IOP Conference Series: Earth and Environmental Science, 16(1).
• Prediction method on rainfall-induced slope failure based on time variation of slope displacement rate observed by model experimentsIn Japanese石澤友浩, 酒井直樹, 福囿輝旗. 日本地すべり学会誌, 50(6), 268–278.

2012

• DDA simulations for slope failure/collapse experiment caused by torrential rainfallT. Koyama, K. Irie, K. Nagano, S. Nishiyama, N. Sakai, Y. Ohnishi. Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10, 119–126.
• Resistivity monitoring for estimation of changes in water content in an embankmentIn Japanese高倉伸一, 吉岡真弓, 内田洋平, 石澤友浩, 酒井直樹. 物理探査, 65(4), 223–236.
• Shear deformation distribution and the variation of pore pressure in a sandy model slope during rainfallK. Sasahara, N. Sakai. Landslides and Engineered Slopes: Protecting Society through Improved Understanding - Proceedings of the 11th International and 2nd North American Symposium on Landslides and Engineered Slopes, 2012, 957–962.
• Shear strain development and pore pressure distribution in sandy model slope under repeated rainfallK. Sasahara, N. Sakai. Advances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012, 743–748.
• VERIFICATION ON THE PROCESS OF RAINFALL-INDUCED SURFACE FAILURE FROM RAINFALL INTENSITY, UNSATURATED SEEPAGE AND DEFORMATION RESULTSIn Japanese檀上徹, 酒匂一成, 深川良一, 酒井直樹, 岩佐直人. 土木学会論文集 C(地圏工学)(Web), 68(3), 508–525.
• 東北地方太平洋沖地震に伴う沿岸域での被害状況についてIn Japanese下川 信也, 飯塚 聡, 村上 智一, 栢原 孝浩, 酒井 直樹, 納口 恭明, 小笠原 敏樹, 安田 孝志. 防災科学技術研究所 主要災害調査東日本大震災調査報告, 73–89.

2010

• Simple monitoring method for precaution of landslides watching tilting and water contents on slopes surfaceTaro Uchimura, Ikuo Towhata, Trinh Thi Lan Anh, Jou Fukuda, Carlos J.B. Bautista, Lin Wang, Ichiro Seko, Taro Uchida, Akira Matsuoka, Yosuke Ito, Yuichi Onda, Sho Iwagami, Min Seok Kim, Naoki Sakai. Landslides, 7(3), 351–357.

2009

• Ring shear tests to evaluate strength parameters in various remoulded soilsH. Toyota, K. Nakamura, M. Sugimoto, N. Sakai. Geotechnique, 59(8), 649–659.
• Study on prediction of failure and flow movement of shallow landslide based on discontinuous deformation analysisIn Japanese酒井直樹, 三木茂. 応用力学論文集, 12, 461–468.

2008

• SHEAR STRENGTH AND VOID RATIO OF UNSATURATED SOIL WITH DIFFERENT INITIAL VOID RATIO AT FAILURE, CRITICAL STATEIn JapaneseSASAHARA Katsuo, SAKAI Naoki, KURIHARA Junichi. Doboku Gakkai Ronbunshuu C, 64(2), 197–208.

2006

• Evaluation of dike and natural slope failure induced by heavy rainfall in Niigata on 13 July 2004Hirofumi Toyota, Kouichi Nakamura, Naoki Sakai. Soils and Foundations, 46(1), 83–98.
• Evalution of natural slope failures induced by the 2004 Niigata-ken Chuetsu EarthquakeHirofumi Toyota, Jinxing Wang, Kouichi Nakamura, Naoki Sakai. Soils and Foundations, 46(6), 727–738.
• STUDY ON VERIFICATION OF ROCKFALL SIMULATION USING IMPROVED DDA CONSIDERING THE CHARACTERISTICS OF VELOCITY ENERGY RATIO AT IMPACTIn Japanese島内哲哉, 大西有三, 西山哲, 酒井直樹. 土木学会論文集 C, 62(3), 707–721.

2004

• EXPERIMENTAL STUDY ON MECHANISM OF SHEAR FAILURE IN BOREHOLE TORSIONAL SHEAR TESTIn JapaneseNAKAMURA Kouichi, TOYOTA Hirofumi, SAKAI Naoki, SHIMAUCHI Tetsuya. Doboku Gakkai Ronbunshu, 2004(764), 373–378.

2003

• APPLICATION OF THE ELASTIC BOUNDARY INDUCED BY SHEAR HISTORY ON SATURATED COHESIVE SOILTOYOTA HIROFUMI, NAKAMURA KOUICHI, SAKAI NAOKI. Journal of the Japanese Geotechnical Society, 43(1), 93–100.
• Experimental study of shear mechanism on borehole torsional shear testIn JapaneseSakai Naoki, Toyota Hirofumi, Shimauchi Tetsuya, Nakamura kouichi. Proceedings of the Japan National Conference on Geotechnical Engineering, 38, 237–238.
• MECHANICAL PROPERTIES OF SATURATED COHESIVE SOILS WITH SHEAR HISTORY UNDER THREE-DIMENSIONAL STRESS CONDITIONSTOYOTA HIROFUMI, SAKAI NAOKI, NAKAMURA KOUICHI. 地盤工学会論文報告集 = Journal of the Japanese Geotechnical Society : soils and foundation, 43(1), 111–114.
• MECHANICAL PROPERTIES OF UNSATURATED COHESIVE SOIL IN CONSIDERATION OF TENSILE STRESSTOYOTA HIROFUMI, NAKAMURA KOUICHI, SAKAI NAOKI, SRAMOON WILAILAK. Journal of the Japanese Geotechnical Society, 43(2), 115–122.
• Mechanical properties of unsaturated cohesive soil in consideration of tensile stressHirofumi Toyota, Kouichi Nakamura, Naoki Sakai, Wilailak Sramoon. Soils and Foundations, 43(2), 115–122.
• VERIFICATION OF RESIDUAL STATE AND DETERMINATION OF RESIDUAL STRENGTH IN RING SHEAR TESTSIn JapaneseSAKAI Naoki, TOYOTA Hirofumi, NAKAMURA Kouichi, SUGIMOTO Mitsutaka. Doboku Gakkai Ronbunshu, 2003(743), 223–228.

2001

• Effects of stress history due to unsaturation and drainage condition on shear properties of unsaturated cohesive soilHirofumi Toyota, Naoki Sakai, Tomoyoshi Nishimura. Soils and Foundations, 41(1), 13–24.
• MECHANICAL PROPERTIES OF SATURATED COHESIVE SOIL WITH SHEAR HISTORY UNDER THREE DIMENSIONAL STRESS CONDITIONSTOYOTA Hirofumi, SAKAI Naoki, NAKAMURA Kouichi. Journal of the Japanese Geotechnical Society, 41(6), 97–110.
• Mechanical properties of saturated cohesive soil with shear history under three dimensional stress conditionsHirofumi Toyota, Naoki Sakai, Kouichi Nakamura. Soils and Foundations, 41(6), 97–110.