Updated on 2025/06/09

写真a

 
KAWAMOTO YOICHI
 
Organization
Faculty of Design Department of Environmental Design Assistant Professor
Graduate School of Design Department of Design(Concurrent)
Title
Assistant Professor
Contact information
メールアドレス
Profile
<Outline of research> Currently, approximately 50% of the world’s population is living in urban areas and that figure is predicted to continue to increase. On the other hand, many cities are facing problems caused by urbanization. The urban heat island phenomenon, one of the urban climate problems, is a typical environmental problem encountered in dense urban areas in summer. I'm tackling these so-called urban climate problems to construct sustainable society from the view point of thermal environment. <Research themes> 1. Numerical simulation of the urban climate using meso-scale meteorological model 2. Field observation to clarify the urban climate

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Architectural environment and building equipment

Degree

  • Ph.D. in Engineering

Research History

  • 2009.04〜2012.03 東京大学GCOE「都市空間の持続再生学の展開」特任助教   

Education

  • The University of Tokyo   工学系研究科   建築学専攻

    2005.4 - 2008.3

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    Country:Japan

    Notes:博士課程

  • The University of Tokyo   工学系研究科   建築学専攻

    2003.4 - 2005.3

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    Country:Japan

    Notes:修士課程

  • Waseda University   理工学部   建築学科

    1998.4 - 2002.3

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    Country:Japan

Research Interests・Research Keywords

  • Research theme: Research on Urban Environment

    Keyword: Urban Environment, Building Environment, Urban Climatology

    Research period: 2012.4 - 2025.3

Awards

  • 日本風工学会出版賞

    2013.5   日本風工学会   That award was granted in recognition of outstanding publication.

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    本書は、「Ventilating Cities ~Air-flow Criteria for Healthy and Comfortable Urban Living(市街地を換気する ~健康的・快適な都市生活のための風環境評価)」と題し、都市の快適性や安全性を維持するための適度な風環境(弱風環境)に関する専門知識を提供すべく、風工学・建築環境工学・都市工学といった各分野の専門家の共著として出版された。

Papers

  • Investigation of the uncertainty of initial and boundary conditions in the hindcasts of flow fields over urban areas using a mesoscale numerical weather prediction model

    Kawamoto Yoichi

    JAPAN ARCHITECTURAL REVIEW   5 ( 4 )   517 - 529   2022.9   ISSN:24758876 eISSN:24758876

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    Language:English   Publisher:Wiley  

    <jats:title>Abstract</jats:title><jats:p>Numerous studies have been conducted using mesoscale numerical weather prediction models to analyze the thermal and wind environments of urban areas around the world. However, weather predictions are highly sensitive to initial conditions. This is the so‐called “butterfly effect.” In this study, the effects of initial and boundary conditions upon the reproduction accuracy for wind environments (particularly for the sea breeze) over the Fukuoka metropolitan area were investigated by varying (i) the objective analysis data used for the initial and boundary conditions and (ii) the length of the spin‐up calculation period. The results of the simulation were compared with surface observations and Doppler LIDAR observations of the airflow field. The accuracy is thought to decrease under an increase in the length of the spin‐up calculation period; however, this was not the case in this study. In terms of the differences in the objective analysis data, no clear trend was observed from the comparisons with surface observations; however, slight differences were observed when comparing with the Doppler LIDAR. The lagged average forecasting method (which reduces the uncertainty of the initial conditions by shifting the calculation start time) was also adopted; the ensemble‐averaged results showed a good correspondence with the observations.</jats:p>

    DOI: 10.1002/2475-8876.12282

    Web of Science

    Scopus

    CiNii Research

  • INVESTIGATION INTO THE UNCERTAINTY OF INITNIAL AND BOUNDARY CONDITIONS IN THE HINDCAST OF FLOW FIELDS OVER URBAN AREA USING A MESO-SCALE NUMERICAL WEATHER PREDICTION MODEL

    KAWAMOTO Yoichi

    Journal of Environmental Engineering (Transactions of AIJ)   87 ( 797 )   460 - 471   2022.7   ISSN:13480685 eISSN:1881817X

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    Language:Japanese   Publisher:Architectural Institute of Japan  

    <p>Many studies have been conducted using meso-scale numerical weather prediction models to analyze the thermal and wind environments of urban areas all over the world. However, weather predictions are highly sensitive to initial conditions. It’s so called the “butterfly effect”. In this study, the effects of the initial and boundary conditions on the accuracy of reproducing the wind environment, especially for the sea breeze, over Fukuoka metropolitan area were investigated by changing the objective analysis data used for the initial and boundary conditions and the length of the spin-up calculation period.</p>

    DOI: 10.3130/aije.87.460

    Scopus

    CiNii Research

  • Effect of land-use change on the urban heat island in the Fukuoka-Kitakyushu metropolitan area, Japan Reviewed

    Yoichi Kawamoto

    Sustainability   9 ( 9 )   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    In coastal cities, the effect of the sea breeze in mitigating the urban heat island (UHI) phenomenon has attracted attention. This study targeted the Fukuoka-Kitakyushu metropolitan area, the fourth largest metropolitan area in Japan which is also coastal. Doppler Light Detection And Ranging (LiDAR) observations were conducted in the summer of 2015 to clarify the transition of the wind field over the targeted area. To investigate the effects on the UHI of land-use change related to urbanization, the National Land Numerical Information (NLNI) land-use datasets for Japan in 1976 (NLNI-76) and 2009 (NLNI-09) were used in the Weather Research and Forecasting (WRF) model. The results of the simulation showed that most of the northern part of the Kyushu region became warmer, with an average increase of +0.236 °C for the whole simulation period. Comparing the two simulations and the Doppler LiDAR observations, the simulation results with the NLNI-09 dataset (for the year closest to the study period in 2015) showed closer conformity with the observations. The results of the simulation using NLNI-76 showed faster sea breeze penetration and higher wind velocity than the observations. These results suggest that the land-use change related to urbanization weakened the sea breeze penetration in this area.

    DOI: 10.3390/su9091521

  • Integrated analysis of numerical weather prediction and computational fluid dynamics for estimating cross-ventilation effects on inhaled air quality inside a factory Reviewed

    Alicia Murga, Yusuke Sano, Yoichi Kawamoto, Kazuhide Ito

    Atmospheric Environment   167   11 - 22   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    Mechanical and passive ventilation strategies directly impact indoor air quality. Passive ventilation has recently become widespread owing to its ability to reduce energy demand in buildings, such as the case of natural or cross ventilation. To understand the effect of natural ventilation on indoor environmental quality, outdoor–indoor flow paths need to be analyzed as functions of urban atmospheric conditions, topology of the built environment, and indoor conditions. Wind-driven natural ventilation (e.g., cross ventilation) can be calculated through the wind pressure coefficient distributions of outdoor wall surfaces and openings of a building, allowing the study of indoor air parameters and airborne contaminant concentrations. Variations in outside parameters will directly impact indoor air quality and residents’ health. Numerical modeling can contribute to comprehend these various parameters because it allows full control of boundary conditions and sampling points. In this study, numerical weather prediction modeling was used to calculate wind profiles/distributions at the atmospheric scale, and computational fluid dynamics was used to model detailed urban and indoor flows, which were then integrated into a dynamic downscaling analysis to predict specific urban wind parameters from the atmospheric to built-environment scale. Wind velocity and contaminant concentration distributions inside a factory building were analyzed to assess the quality of the human working environment by using a computer simulated person. The impact of cross ventilation flows and its variations on local average contaminant concentration around a factory worker, and inhaled contaminant dose, were then discussed.

    DOI: 10.1016/j.atmosenv.2017.08.003

  • Effect of urbanization on the urban heat island in Fukuoka-Kitakyushu metropolitan area, Japan Reviewed International journal

    Yoichi Kawamoto

    Procedia Engineering   16   224 - 231   2016.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    In the coastal cities, the use of the sea breeze to mitigate the urban heat island phenomenon has attracted attention. To accumulate data for the urban climate in the Fukuoka-Kitakyushu metropolitan area, the fourth largest metropolitan area in Japan and located in coastal area, numerical simulations with a meso-scale meteorological model, the Weather Research and Forecast model (WRF), and upper air observation with Doppler LIDAR were carried out in the summer of 2015, simultaneously. The results of this study suggested that the urbanization process weakened sea breeze penetration.

    DOI: doi: 10.1016/j.proeng.2016.10.027

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Presentations

  • メソスケール気象モデルを用いた海風の再現計算へのLagged Average Forecasting法の適用 その2 乱流運動エネルギーの比較

    川本 陽一

    日本建築学会大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都大学   Country:Japan  

  • メソスケール気象モデルを用いた海風の再現計算へのLagged Average Forecasting法の適用

    川本 陽一

    日本建築学会大会学術講演会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • メソスケール解析における初期値・境界値の不確実性に関する検討(その3) ドップラーライダーによる観測値との比較

    川本 陽一

    日本建築学会大会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 都市形態解析に基づく都市キャノピー層内の不均一性に関する考察(その2) Frontal Area Indexによる都市形態の不均一性の検討

    川本 陽一

    日本建築学会  2020.9 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • メソスケール解析における初期値・境界値の不確実性に関する検討(その2) 数値解析の誤差評価

    川本 陽一

    日本建築学会大会  2019.9 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢工業大学   Country:Japan  

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Professional Memberships

  • International Association for Urban Climate

  • Meteorological Society of Japan

  • The Society of Heating, Air-Conditioning and Sanitary Engineers of Japan

  • Architectural Institute of Japan

  • Heat Island Institute International

Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2024

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

    Proceedings of International Conference Number of peer-reviewed papers:9

  • 司会

    日本建築学会大会  ( Japan ) 2023.9

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

    Number of peer-reviewed articles in Japanese journals:1

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Research Projects

  • デジタルツインを用いた都市形態の不均一性の解析

    2024.4 - 2025.3

    大林財団  研究助成事業 

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    Authorship:Principal investigator  Grant type:Competitive funding other than Grants-in-Aid for Scientific Research

  • Development of stochastic urban climate analysis system using ensemble simulation

    Grant number:20K21035  2020.7 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Exploratory)

    川本 陽一

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    Authorship:Principal investigator  Grant type:Scientific research funding

    都市に固有の気候現象である都市気候の諸問題の研究手法として、メソスケール気象モデルを用いた数値解析が広く用いられる。しかし、都市気候研究では数値解析の結果を決定論的に評価している現状がある。即ち、数値解析の不確実性は考慮されず、それぞれ単一の数値解析の結果を以て評価している。一方、数値解析では初期値・境界値に起因する誤差により、結果は不確実性を含む。
    本研究では、単一の結果を評価する決定論的評価に対して、複数のアンサンブルシミュレーションの結果を統計的に評価する確率論的評価を行い、初期値・境界値に起因する不確実性を低減する事により信頼性の高い都市気候数値解析システムを構築することを目的とする。

    CiNii Research

  • 先端的計算科学研究プロジェクト

    2014.1 - 2014.3

    九州大学 芸術工学研究院 鹿島建設 技術研究所 

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    Authorship:Principal investigator 

    This project was cooperated with Kajima Technical Research Institute. In this project, wind environment in the complicated urban area was simulated using FX10 owned by Kyushu University.

  • 海陸風循環が沿岸都市の都市気候形成に及ぼす影響の包括的研究

    Grant number:25709053  2013 - 2016

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 奨学寄付金

    2013

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    Grant type:Donation

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Class subject

  • 環境工学

    2025.12 - 2026.2   Winter quarter

  • 熱環境学特論

    2025.10 - 2026.3   Second semester

  • 設備計画論

    2025.10 - 2025.12   Fall quarter

  • 環境テクノロジー実習B

    2025.6 - 2025.7   Summer quarter

  • 環境デザインプロジェクトA

    2025.4 - 2025.9   First semester

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FD Participation

  • 2023.11   Role:Participation   Title:GakuNinRDMの使い方

    Organizer:University-wide

  • 2023.2   Role:Participation   Title:より効果的な研究成果の国際発信を目指して

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2022.2   Role:Participation   Title:教務システム(特にシラバス)と学修成果学びの質保証の関係について

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2019.1   Role:Participation   Title:M2B/Moodle 講習会

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2017.2   Role:Participation   Title:自殺防止メンタルヘルス研修会

    Organizer:[Undergraduate school/graduate school/graduate faculty]

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Participation in international educational events, etc.

  • 2024.9

    台湾・国立成功大学と九州大学芸術工学研究院

    台湾・国立成功大学との共同ワークショップ

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    Venue:福岡

    Number of participants:10

  • 2019.9

    台湾・国立成功大学と九州大学芸術工学研究院

    台湾・国立成功大学との共同ワークショップ

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    Venue:福岡

    Number of participants:10

Other educational activity and Special note

  • 2025  Class Teacher  学部

  • 2024  Class Teacher  学部

  • 2017  Class Teacher  学部

  • 2016  Class Teacher  学部

  • 2015  Class Teacher  学部

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Social Activities

  • 出前授業「環境の多重構造 - 地球環境・都市環境・建築環境 -」

    福岡県立明善高等学校  2023.7

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 出前授業「環境の多重構造 - 地球環境・都市環境・建築環境 -」

    長崎県立大村高等学校  2019.7

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 出前授業「環境の多重構造 - 地球環境・都市環境・建築環境 -」

    佐賀県立武雄高校  2018.7

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 出前授業「大学で学ぶこと」

    香住丘高等学校  2017.3

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop