DAIRAKU Koji

Affiliation
Institute of Systems and Information Engineering
Official title
Associate Professor
URL
Email
+96>G6@JXgc@OaIHJ@J76a68a?E
Research fields
Hydraulic engineering
Research keywords
Regional Hydroclimate
Hydrometeorology
Water Cycle
Regional Climate
Downscaling
Large Scale Simulation
Environmental Disaster Prevention
Water Hazard Risk Information
Research projects
Evaluation of cooling and retention effects of rice paddy fields for basin flood control in low-lying rural areas2025-01 -- 2026-03Dairaku, KojiMinistry of Land, Infrastructure, Transport and Tourism/River and Erosion Control Technology Development5,940,000Yen
Development of a method to evaluate the effectiveness of green infrastructure for river basin flood control2024-04 -- 2026-03Dairaku, KojiKanto Regional Management Service Association/Public benefit projects1,900,000Yen
Low flow forecast for water resource management in low-lying rice fields2024-04 -- 2025-03Dairaku, KojiUniversity of Tsukuba/Project for University-Industry Cooperation Strengthening in Tsukuba1,000,000Yen
Academic advising on quantification of climate change risks2023-07 -- (current)Dairaku, KojiSOMPO RISK MANAGEMENT/Collaborative Research
Academic advising on quantification of climate change risks2020-10 -- 2023-06Dairaku, KojiSOMPO RISK MANAGEMENT/Academic advising
Towards robust projections of climate extremes and adaptation plans over South Asia2018 -- 2020Ali, ShaukatAsia-Pacific Network for Global Change Research/Collaborative Regional Research Programme: CRRP
Development of downscaling technologies2015-12 -- 2020-03Dairaku, KojiMinistry of Education, Culture, Sports, Science and Technology, Japan/Social Implementation Program on. Climate Change Adaptation Technology (SI-CAT)119,100,000Yen
Career history
2019-04 -- (current)University of TsukubaGraduate School of Systems and Information EngineeringAssociate Professor
2019-07 -- 2020-03National Research Institute for Earth Science and Disaster ResilienceMulti-hazard Risk Assessment Research DivisionPrincipal Research Fellow (Cross Appointment)
2016-09 -- 2019-03Malaysia-Japan International Institute of Technology (MJIIT)Master of Disaster Risk Management program (MDRM)Visiting Associate Professor
2016-04 -- 2019-03National Research Institute for Earth Science and Disaster ResilienceIntegrated Research on Disaster Risk Reduction DivisionSenior Researcher
2011-04 -- 2016-03National Research Institute for Earth Science and Disaster PreventionSocial System Research Department, Disaster Risk Research UnitSenior Researcher
2010-10 -- 2011-03National Research Institute for Earth Science and Disaster PreventionDisaster Prevention Research CenterSenior Researcher
2009-06 -- 2010-05University of Colorado at Boulder　Cooperative Institute for Research in Environmental Sciences (CIRES)　Research Associate (Visiting Scientist)
2009-04 -- 2010-09National Research Institute for Earth Science and Disaster PreventionStorm, Flood, and Landslide Research DepartmentSenior Researcher
2008-07 -- 2009-03National Research Institute for Earth Science and Disaster PreventionStorm, Flood, and Landslide Research DepartmentResearcher
2006-04 -- 2008-06National Research Institute for Earth Science and Disaster PreventionStorm, Flood, and Landslide Research DepartmentResearcher
more...
Academic background
2000-04 -- 2003-03The University of Tokyo Graduate School of Engineering Department of Civil Engineering
Degree
1998-03DiplomaThe University of Tokyo
2000-03MScThe University of Tokyo
2003-03Ph. DThe University of Tokyo
Licenses and qualifications
2002-03Type-1 High school teaching license for Science
2002-03Type-1 Junior high school teaching license for Science
Academic societies
2016-10 -- (current)Japan Geoscience Union
-- (current)Japan Society of Civil Engineers (JSCE)
-- (current)The Japan Society of Hydrology and Water Resources
-- (current)The Meteorological Society of Japan
-- (current)American Geophysical Union (AGU)
-- (current)Asia Oceania Geosciences Society (AOGS)
-- (current)The Asia Pacific Association of Hydrology and Water Resources (APHW)
Honors & Awards
2025-05-19JSCE International Outstanding Collaboration AwardOutstanding contributions internationally to the improvement and advancement of civil engineering (Dairaku, Koji)
2025-03-25SICE Outstanding Student AwardA student with excellent character and academic performance (Llorin, Alyssa Gewell Agena)
2025-03-25Ezaki Prize of the University of Tsukuba Alumni AssociationOutstanding achievements in research activities during enrollment (Llorin, Alyssa Gewell Agena)
2025-03-25The Degree Programs in Systems and Information Engineering (SIE) Degree Programs Dean's awardLocal and Synoptic Influences on Long-term Trends in Rainfall over Metro Manila, Philippines (Llorin, Alyssa Gewell Agena)
2024-10-15Scientific Forum for Numerical Simulation of Asian Regional Climate Change and Earth System Process's Best Poster AwardLocal and Synoptic Influences on Long-Term Trends in Rainfall over Metro Manila, Philippines (Llorin, Alyssa Gewell Agena; Dairaku, Koji)
2024-05EMCEI-2024’s Best Paper AwardLocal and Synoptic Drivers for Rainfall Formation over Metro Manila, Philippines (Llorin, Alyssa Gewell Agena; Dairaku, Koji)
2024-03-25Tsukuba Scholarship "Research Encouragement Scholarship"Analysis of feedback process on water availability in Africa from the past to future (Nguyen, Ngoc Kim Hong)
2024-03-25Degree Program in Engineering Mechanics and Energy (EME) Degree Program Director's awardAnalysis of feedback process on water availability in Africa from the past to future (Nguyen, Ngoc Kim Hong)
2024-03-25Degree Program in Engineering Mechanics and Energy (EME) Degree Program Director's awardAdded Values on Wind Energy Potential for South Asia Using High-Resolution Climate Models (Khan, Muhammad Abid)
2024-03-25Degree Program in Engineering Mechanics and Energy (EME) Degree Program Director's awardImpact of Climate Change, Land Use and Land Cover Change on the Hydrological Response in Upper Blue Nile Basin (Brhane, Ermias Sisay)
2023-07-092023 International Young Scientists Forum Best Presentation AwardUncertainty Analysis of PERSIANN-family Precipitation Products over Himalayan Mountains of Pakistan, South Asia (Nadeem, Muhammad Umar; Dairaku, Koji)
2023-03-24Degree Program in Engineering Mechanics and Energy (EME) Degree Program Director's awardAnthropogenic influence on extreme precipitation over East Asia (Adigun, Paul Ayodele)
2022-12AGU 2022 Outstanding Student Presentation Award (OSPA)Building a high-resolution climate dataset for Vietnam based on ERA5-Land and In-situ data (Nguyen, Ngoc Kim Hong; Thanh, Ngo-Duc; Dairaku, Koji)
2022-03Outstanding Discussion AwardOutstanding discussions at the Conference on Hydraulic Engineering (Dairaku, Koji)
Articles
  • Addressing Biases and Enhancing Accuracy: The Role of Downscaled Climate Models in East Africa
    Endalew Negusu Tarekegn; Dairaku Koji; Nguyen Ngoc Kim...
    Euro-Mediterranean Journal for Environmental Integration, 2025-06
  • Sensitivity of WRF Parameterization Combinations in Simulating Precipitation Over the Upper Blue Nile Basin
    Endalew Negusu Tarekegn; Dairaku Koji
    Euro-Mediterranean Journal for Environmental Integration, 2025-06
  • Copula-based Multivariate Drought Index for Monitoring Drought in the Upper Blue Nile Basin, Ethiopia
    Defersha Dessalew Tadesse; Dairaku Koji; Nguyen Ngoc K...
    Euro-Mediterranean Journal for Environmental Integration, 2025-06
  • Extreme Precipitation Assessment in the Southeast Greater Mekong Subregion: Insights from Statistical Downscaling
    Nguyen Ngoc Kim Hong; Dairaku Koji
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Refining Regional Climate: High-Resolution Statistical Downscaling with Relative Humidity and Temperature over Southeast of the Greater Mekong Subregion
    Nguyen Ngoc Kim Hong; Dairaku Koji
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Machine Learning-Based Downscaling of High-Resolution GCMs for Accurate Precipitation Tracking in Flood-Prone Regions of Pakistan
    Nadeem Muhammad Umar; Dairaku Koji; Adigun Paul Ayodele
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Assessing Hydrological Uncertainty in the Upper Blue Nile Basin: A Multi-Model Evaluation
    Endalew Negusu Tarekegn; Dairaku Koji; Adigun Paul Ayo...
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Evaluation of the Influence of Climate Change on Solar Power Potential in Japan
    Shobayashi Narin; Dairaku Koji; Adigun Paul Ayodele
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Dynamic-Thermodynamic Coupled Systems Metrics for Improving Tropical Cyclone Intensity Estimation in CMIP6 Models
    Adigun Paul Ayodele; Dairaku Koji
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Assessing the Impact of Projected Climate Change on Sediment Yield Using CMIP6 Ensemble Models
    Doko Hailemariam Mengistu; Dairaku Koji; Defersha Dess...
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Groundwater Level Fluctuations and Dynamics in the Semi-Arid Region of Northeastern Ethiopia
    Doko Hailemariam Mengistu; Dairaku Koji; Defersha Dess...
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Assessing the Hydrological Impacts of Future Land Use Change Scenarios in the Upper Blue Nile Basin Using an Integrated FLUS-SWAT Modeling Approach
    Brhane Ermias Sisay; Dairaku Koji; Adigun Paul Ayodele
    Earth Systems and Environment (ESEV-2025) Proceedings, 2025-4
  • Assessing wind power generation potential over South Asia using wind speed observation and reanalysis datasets
    Khan Muhammad Abid; DAIRAKU Koji; Kelkar Saurabh
    STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT/39/pp.1179-1207, 2025-02
  • Spatiotemporal analysis of drought patterns and trends across Africa: a multi-scale SPEI approach (1960-2018)
    Ogunrinde Akinwale T.; Adigun Paul; Xue Xian; Dairaku ...
    INTERNATIONAL JOURNAL OF DIGITAL EARTH/18(1), 2025-1-06
  • The future of photovoltaic energy potential in Africa under higher emission scenarios: Insights from CMIP6 multi-model ensemble analysis
    Adigun Paul; Ogunrinde Akinwale T.; Dairaku Koji; Adeb...
    SOLAR ENERGY/285, 2025-01-01
  • Study for the creation of stochastic Japanese Tropical Cyclone (TC) events and economic loss assessment in future climate
    Arai Takayoshi; Tsurushima Daiki; Dairaku Koji; Shimok...
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Research on the water retention and cooling effects of urban greening for climate change adaptation
    Aoki Fumiya; Dairaku Koji
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Development and Evaluation of a Novel Precipitation Product for Extreme Events: A Principal Component Analysis Approach
    Nadeem Muhammad Umar; Dairaku Koji; Nguyen Ngoc Kim Ho...
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Investigating the Impact of Climate Change on the Hydrology of Gumara Maksegnit Watershed, Lake Tana Basin, Ethiopia
    Defersha Dessalew Tadesse; Dairaku Koji; Doko Hailemar...
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Significance of upper troposphere cooling in modulating tropical cyclone potential intensity in the recent decade
    Adigun Paul Ayodele; Dairaku Koji
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Anthropogenic influence on changing extreme precipitation patterns over East Asia
    Adigun Paul Ayodele; Dairaku Koji
    Advances in Science, Technology & Innovation (ASTI), 2024-11
  • Multi-scale drought variability over West Africa and the associated large-scale circulation patterns
    Ogunrinde Akinwale T.; Adigun Paul; Xian Xue; Yu Haip...
    GEOMATICS NATURAL HAZARDS & RISK/15(1), 2024-10-11
  • Evaluation of Wind Speed Accuracy Enhancement in South Asia Through Terrain-Modified Wind Speed (Wt) Adjustments of High-Resolution Regional Climate Modeling
    Khan Muhammad Abid; DAIRAKU Koji; Kelkar Saurabh
    EARTH SYSTEMS AND ENVIRONMENT/Epub, 2024-08
  • Unraveling Soil Moisture Response and Water Availability over Africa in the past and projection scenarios
    Nguyen Ngoc Kim Hong; Dairaku Koji
    Euro-Mediterranean Journal for Environmental Integration, 2024-05
  • Random forest classification for land use land cover mapping the case of Awash Basin
    Doko Hailemariam Mengistu; Dairaku Koji
    Euro-Mediterranean Journal for Environmental Integration, 2024-05
  • more...
Conference, etc.
  • Heat Stress Analysis by Statistical Downscaling Over Vietnam and Cambodia Regions Towards Local Climate Risk Assessment
    Nguyen Ngoc Kim Hong; Dairaku Koji
    22nd Annual Meeting of the Asia Oceania Geosciences Society (AOGS 2025)/2025-07-31
  • Hybrid Statistical Downscaling and Moist Heatwave Analysis over Southeast Greater Mekong
    Nguyen Ngoc Kim Hong; Dairaku Koji
    22nd Annual Meeting of the Asia Oceania Geosciences Society (AOGS 2025)/2025-07-30
  • Investigating The Urban Rainfall Effect Of Metro Manila, Philippines Under Varying Synoptic Conditions Using The WRF Model
    Llorin Alyssa Gewell Agena; Dairaku Koji
    22nd Annual Meeting of the Asia Oceania Geosciences Society (AOGS 2025)/2025-07-29
  • Evaluating Urban Greening's Effects on Water Retention and Cooling in East Asia for Climate Change Adaptation
    Aoki Fumiya; Dairaku Koji; Wang Yingfu; Brhane Ermias...
    22nd Annual Meeting of the Asia Oceania Geosciences Society (AOGS 2025)/2025-07-29
  • Copula-based Multivariate Drought Index for Monitoring Drought in the Upper Blue Nile Basin, Ethiopia
    Defersha Dessalew Tadesse; Dairaku Koji; Nguyen Ngoc K...
    7th Euro-Mediterranean Conference for Environmental Integration (EMCEI-2025)/2025-06-24
  • Addressing Biases and Enhancing Accuracy: The Role of Downscaled Climate Models in East Africa
    Endalew Negusu Tarekeg; Dairaku Koji; Nguyen Ngoc Kim ...
    7th Euro-Mediterranean Conference for Environmental Integration (EMCEI-2025)/2025-06-23
  • Sensitivity of WRF Parameterization Combinations in Simulating Precipitation Over the Upper Blue Nile Basin
    Endalew Negusu Tarekeg; Dairaku Koji
    7th Euro-Mediterranean Conference for Environmental Integration (EMCEI-2025)/2025-06-23
  • Evaluation of the Influence of Climate Change on Solar Power Potential in Japan
    正林 奈倫; 大楽 浩司
    Japan Geoscience Union Meeting 2025/2025-05-28
  • Investigation of Key Role in Hotspot Occurrence using Multivariate Principal Component and Distribution Analysis (Study case: Kalimantan and South Sumatra, Indonesia)
    Septiawan Pandu; Dairaku Koji
    Japan Geoscience Union Meeting 2025/2025-05-27
  • Evaluating Urban Greening’s effects on Water Retention and Cooling in East Asia for Climate Change Adaptation
    青木 文弥; 大楽 浩司
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Rainfall Erosivity in a Changing Climate: Historical Trends and Future Projections from CMIP6
    Doko Hailemariam Mengistu; Dairaku Koji; Brhane Ermias...
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Assessing Hydrological Uncertainty in the Lake Tana Sub-Basin of the Blue Nile, Ethiopia Using CMIP5, CMIP6, and CORDEX Models
    Endalew Negusu Tarekegn; Dairaku Koji; Adigun Paul Ayo...
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Parametric Multivariate Index for Monitoring Drought in the upper Blue Nile River basin, Ethiopia
    Defersha Dessalew Tadesse; Dairaku Koji; Nguyen Ngoc K...
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Hydrological Response to Climate Change-Induced Extreme Rainfall in Pakistan
    Nadeem Muhammad Umar; Dairaku Koji
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Statistical Downscaling of CMIP6 GCMs for the Southeast Greater Mekong Subregion Towards Strengthening Local Climate Impact Assessments
    Nguyen Ngoc Kim Hong; Dairaku Koji
    Japan Geoscience Union Meeting 2025/2025-05-26
  • Extreme Precipitation Assessment in the Southeast Greater Mekong Subregion: Insights from Statistical Downscaling
    Nguyen Ngoc Kim Hong; Dairaku Koji
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Evaluation of the Influence of Climate Change on Solar Power Potential in Japan
    Shobayashi Narin; Dairaku Koji; Adigun Paul Ayodele
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Dynamic-Thermodynamic Coupled Systems Metrics for Improving Tropical Cyclone Intensity Estimation in CMIP6 Models
    Adigun Paul Ayodele; Dairaku Koji
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Assessing Hydrological Uncertainty in the Upper Blue Nile Basin: A Multi-Model Evaluation
    Endalew Negusu Tarekegn; Dairaku Koji; Adigun Paul Ayo...
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Assessing the Impact of Projected Climate Change on Sediment Yield Using CMIP6 Ensemble Models.
    Doko Hailemariam Mengistu; Dairaku Koji; Defersha Dess...
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Groundwater Level Fluctuations and Dynamics in the Semi-Arid Region of Northeastern Ethiopia
    Doko Hailemariam Mengistu; Dairaku Koji; Defersha Dess...
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-29
  • Refining Regional Climate: High-Resolution Statistical Downscaling with Relative Humidity and Temperature over Southeast of the Greater Mekong Subregion
    Nguyen Ngoc Kim Hong; Dairaku Koji
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-28
  • Machine Learning-Based Downscaling of High-Resolution GCMs for Accurate Precipitation Tracking in Flood-Prone Regions of Pakistan
    Nadeem Muhammad Umar; Dairaku Koji; Adigun Paul Ayodele
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-28
  • Assessing the Hydrological Impacts of Future Land Use Change Scenarios in the Upper Blue Nile Basin Using an Integrated FLUS-SWAT Modeling Approach
    Brhane Ermias Sisay; Dairaku Koji; Adigun Paul Ayodele
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-28
  • Analysis of Compound Dry-Hot-Windy Condition Impact to Forest Fire in Southeast Asia and Australia
    Septiawan Pandu; Dairaku Koji; Nurdiati Sri; Sopaheluw...
    1st Earth Systems and Environment Journal Annual Meeting (ESEV-2025)/2025-04-28
  • more...
Teaching
2025-04 -- 2025-07Advanced DynamicsUniversity of Tsukuba.
2025-10 -- 2026-02Research in Engineering Mechanics and Energy IIbUniversity of Tsukuba.
2025-04 -- 2025-08Research in Engineering Mechanics and Energy IIaUniversity of Tsukuba.
2025-10 -- 2026-02Research in Engineering Mechanics and Energy IIUniversity of Tsukuba.
2025-04 -- 2025-08Research in Engineering Mechanics and Energy IIUniversity of Tsukuba.
2025-10 -- 2026-02Research in Engineering Mechanics and Energy IbUniversity of Tsukuba.
2025-04 -- 2025-08Research in Engineering Mechanics and Energy IaUniversity of Tsukuba.
2025-10 -- 2026-02Research in Engineering Mechanics and Energy IUniversity of Tsukuba.
2025-04 -- 2025-08Research in Engineering Mechanics and Energy IUniversity of Tsukuba.
2025-10 -- 2026-02Seminar in Engineering Mechanics and Energy IIbUniversity of Tsukuba.
more...
Other educational activities
2019-10 -- 2019-10Special LectureUniversity of Tsukuba
Professional activities
2025-01 -- (current)Coordinated Regional climate Downscaling Experiment (CORDEX) Task Force on Machine LearningMember, CORDEX Task Force on Machine Learning
2021-06 -- 2022-03Saitama Prefectural Environmental Science International CenterVisiting Researcher
2018-04 -- 2024-09Science Council of Japan (SCJ)GEWEX Subcommittee Member, Joint FE-WCRP Working Group under the Environmental Sciences Committee and Earth and Planetary Sciences Committee
2018-01 -- 2020-03National Research Institute for Earth Science and Disaster Resilience (NIED)Staff Member, Branding Promotion Office
2016-11 -- (current)Coordinated Regional climate Downscaling Experiment (CORDEX)Asia Point of Contact (POC)
2016-10 -- 2024-12The Japan Society of Hydrology and Water ResourcesSecretary, Tsukuba Group, Editorial and Publication Committee
2014-10 -- 2016-10The Japan Society of Hydrology and Water ResourcesExecutive Secretary, Editorial and Publication Committee
2012-03 -- (current)Japan Society of Civil Engineers (JSCE)Member, Subcommittee on Global Environmental Hydraulics, Committee on Hydraulic Engineering,
2010-04 -- 2021-03Institute of Industrial Science, The University of TokyoResearch Fellow
2009-10 -- (current)The Japan Society of Hydrology and Water ResourcesMember, Editorial and Publication Committee
more...
University Management
2025-04 -- 2027-03Public Relations Committee, Degree Program in Engineering Mechanics and Energy (EME)Public Relations Committee Member
2025-04 -- 2027-03Faculty Development(FD) Committee, College of Engineering SystemsFaculty Development(FD) Committee Member
2023-11 -- 2024-10Shinwa-kai (Faculty and Staff Association)Executive Committee Member
2023-11 -- 2025-10Career Committee, College of Engineering SystemsCareer Committee Member
2023-08 -- 2025-07Career Committee, Degree Program in Engineering Mechanics and Energy (EME)Career Committee Member
2023-07 -- 2024-04Specialized Committee for Entrance Examination Question Preparation, University of TsukubaMember of the Specialized Committee for Entrance Examination Question Preparation
2023-04 -- 2025-04New Student Orientation Committee & University Information Session Coordinator, College of Engineering SystemsCommittee Member for New Student Orientation and Coordinator for University Information Sessions
2021-04 -- 2023-03Public Relations Committee, Degree programs in Systems and Information EngineeringChair
2021-04 -- 2023-03General Affairs Committee, Degree Program in Engineering Mechanics and Energy (EME)General Affairs Committee Member (Administrative Affairs)
2021-04 -- 2023-03Faculty Advisor for StudentsFaculty Advisor for Students (Co-Chair, Class Liaison Meeting)
more...

(Last updated: 2025-09-17)