Search Results 1-20 of 1172

  • Analysis on speed distribution on Metropolitan Expressway using radar precipitation intensity  [in Japanese]

    HATTORI Mitsuhiro , INAMURA Hajime , OGUCHI Takashi , HIBINO Naohiko , MORICHI Shigeru

    <p>降雨時は制動距離の伸長や視界不良等の晴天時と比べて運転条件が厳しくなる．本研究では，高い時空間分解能を有するXバンドMPレーダを主とした雨量観測ネットワークであるXRAINのデータを利用する．アメダス雨量計とXRAINのデータを比較すると，時間的，空間的なずれ，降雨強度のずれが顕著な場合があるため，高速道路上の雨量を捉えるためにはXRAINのデータの有用性を示した．首都高速道路上 …

    JSTE Journal of Traffic Engineering 7(2), A_133-A_141, 2021

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  • Enhancement of Extremely Heavy Precipitation Induced by Typhoon Hagibis (2019) due to Historical Warming

    Kawase Hiroaki , Yamaguchi Munehiko , Imada Yukiko , Hayashi Syugo , Murata Akihiko , Nakaegawa Tosiyuki , Miyasaka Takafumi , Takayabu Izuru

    … <p>Impacts of historical warming on extremely heavy rainfall induced by Typhoon Hagibis (2019) are investigated using a storyline event attribution approach with the Japan Meteorological Agency Nonhydrostatic Model (JMA-NHM). … Control experiments based on JMA mesoscale analysis data well reproduce the typhoon's track, intensity, and heavy precipitation. …

    SOLA 17A(Special_Edition), 7-13, 2021

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  • RISK LEVEL ASSESSMENT OF SMALL-SCALE MOUNTAINS STREAM USING A DIGITAL ELEVATION MODEL  [in Japanese]

    MORI Taiki , SUGIYAMA Tomoyasu , SATOFUKA Yoshifumi , TOCHINO Hiroshi

    <p>　近年，降雨強度が高まる傾向にあり，鉄道では渓流からの土砂流入災害が増加している．鉄道沿線には数多くの渓流があり，危険渓流抽出のための現地調査には時間や労力を有する．また，渓流には，地形や地質等の様々な要因が混在するため，技術者の危険度評価にばらつきが生じる．とりわけ，線路から遠く離れた位置に存在し，かつ広範囲に分布する上流域に対する危険度評価は，膨大な時間と労力を要する上に，技 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 77(1), 24-38, 2021

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  • Editorial

    Wada Akiyoshi

    … It is of great scientific interest that the causes and processes are clarified particularly on strong winds of Jebi and Faxai and heavy rainfall of Hagibis.<br/> … Regarding the prediction of typhoon intensity in 2018-2019, rapid intensification and weakening of typhoons remain challenging scientific topics. …

    SOLA 17A(Special_Edition), i-i, 2021

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  • The Synoptically-Influenced Extreme Precipitation Systems over Asian-Australian Monsoon Regio Observed by TRMM Precipitation Radar

    JIAN Hong-Wen , CHEN Wei-Ting , CHEN Peng-Jen , WU Chien-Ming , RASMUSSEN Kristen L.

    … <p> This study investigates the synoptic scale flows associated with extreme rainfall systems over the Asian-Australian monsoon region (90-160°E and 12°S-27°N). …

    Journal of the Meteorological Society of Japan. Ser. II, 2021

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  • Rainfall Characteristics and their Environmental Conditions during the Heavy Rainfall Events over Japan in July of 2017 and 2018

    UNUMA Takashi , TAKEMI Tetsuya

    … <p> In July of 2017 and 2018, heavy rainfall events occurred, leading to significant damage in Japan. … This study investigated the rainfall characteristics and environmental conditions for these heavy rainfall events using rain intensity data from operational weather radars and mesoscale analysis data. …

    Journal of the Meteorological Society of Japan. Ser. II, 2021

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  • Flood Disaster and Rainfall-Runoff Process of Typhon No.19 (Hagibis) in 2020  [in Japanese]

    佐山 敬洋

    … These differences were mainly due to the rainfall intensity, contributing areas and topography. …

    京都大学防災研究所年報. A = Disaster Prevention Research Institute Annuals. A 63(A), 82-90, 2020-12

    IR 

  • An Influence of Atmospheric Stabilization and Water Vapor Invasion on Characteristics of Guerrilla-heavy Rainfall under Climate Change  [in Japanese]

    中北 英一 , 橋本 郷志 , 小坂田 ゆかり

    … Theoretically, the capacity of the atmosphere to hold water and therefore rain intensity are governed by the Clausius-Clapeyron equation. … In this study, we figure out the future changes in rain intensity of cumulonimbus cloud using pseudo global warming experiments in order to analyze the mechanism of those changes from the view point of dynamic and thermodynamic. … Finally we analyze the correspondence between rain intensity and atmospheric instability indices. …

    京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 63(B), 241-271, 2020-12

    IR 

  • Analysis on the Future Change of Back-building Extreme Rainfall by Pseudo Global Warming Experiment Based on Different Resolutions for 2012 Kameoka Event  [in Japanese]

    小坂田 ゆかり , 中北 英一

    … Pseudo global warming experiments (PGW) were conducted with 1000m and 500m horizontal resolution for the 2012 Kameoka extreme rainfall event, which was the type of back-building convection system. … As a result, the back-building system was very well represented in both of present and PGW experiments, and the rainfall intensity and total rainfall increased in PGW experiments. …

    京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 63(B), 233-240, 2020-12

    IR 

  • Characteristics of the Magnitude and Distribution of Landslides Induced by the Heavy Rain Event of July 2018 in the Southwestern Part of Ehime Prefecture, Japan  [in Japanese]

    木村 誇 , 若月 強 , 山田 隆二 , 井口 隆

    … Although there were little differences in rainfall intensity and total rainfall between the north and south side of the geological boundary of the Chichibu and Shimanto Belt, which was located at the center of the study area, landslides concentrated in the Shimanto Belt of the south side. …

    主要災害調査 = National Disaster Research Report (53), 67-82, 2020-03-26

    IR  DOI 

  • CORRIGENDA: STUDY ON ESTIMATION METHOD FOR SURCHARGE SNOW LOAD DUE TO RAINFALL:(Masaya OTSUKI, Toru TAKAHASHI, Tsukasa TOMABECHI, Takahiro CHIBA, Takuya TSUTSUMI, Isao KAMIISHI, Hitomitsu KIKITSU, Yoshihiro IWATA, Tadashi ISHIHARA and Yasuo OKUDA, J. Struct. Constr. Eng., AIJ, Vol. 82, No. 739, 1329-1338, Sep., 2017)  [in Japanese]

    OTSUKI Masaya , OKUDA Yasuo , TAKAHASHI Toru , TOMABECHI Tsukasa , CHIBA Takahiro , TSUTSUMI Takuya , KAMIISHI Isao , KIKITSU Hitomitsu , IWATA Yoshihiro , ISHIHARA Tadashi

    … <p> To propose a calculation method for snow loads that takes rainfall after snowfall into account, a rainfall experiment was conducted. … The load reaches its peak once the rainfall intensity and flow rate at the eaves reaches equilibrium. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (769), 449-449, 2020-03

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  • APPLICABILITY OF A COMPACT DOPPLER SENSOR FOR VEHICLE PRECIPITATION MEASUREMENTS  [in Japanese]

    小野村 史穂 , 南光 一樹 , 仲吉 信人

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 65, Ⅰ_211-216, 2020

  • Evaluation of the Relationship Between Urban Scale and the Rainfall Inundation Risk in Five Cities of Japan  [in Japanese]

    NAKAGUCHI Kota , KOMORI Daisuke

    … <p>The relation between urban scale and the risk of rainfall inundation or the impacts of factors on the occurrence of rainfall inundation were quantitatively evaluated. … The results of this study were as follows: 1) The risk of rainfall inundation increases as the urban scale increases, and decreases with further increases of urban scale. …

    Journal of Social Safety Science 37(0), 49-55, 2020

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  • APPLICATION OF A DEEP-LEARNING METHOD INCLUDING SHORTCUT PATHS TO CORRECT THE PRECIPITATION OUTPUTS OF A NUMERICAL WEATHER PREDICTION MODEL  [in Japanese]

    KURAKAMI Takeru , SOUMA Kazuyoshi , MIYAMOTO Takashi , FURUYA Takahiko , MAGOME Jun , ISHIDAIRA Hiroshi

    <p>　本研究では，数値気象モデルによる降水量予測補正に，複数のショートカット接続を持つ深層畳み込みニューラルネットワーク（U-Net）を導入した．入力データについては2001年8月の京阪神地域における数値気象モデルの降水量と地上鉛直風速の出力を学習用，検証用に分割して用いた．通常の深層畳み込みニューラルネットワーク（CNN）を用いた場合と比較して，空間スケールの大きい（一つの降水域が …

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 76(5), I_471-I_478, 2020

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  • Spectrum Comparison of Raw Water Using Three-Dimensional Fluorescence Excitation-Emission Matrix and Control of Disinfection By-Product by the Color of the Filtered Water  [in Japanese]

    KIMURA Takuya , SASAKI Makoto , KOYAMA Yuki , SASAHARA Takashi , TSUJI Masahito , YOSHIZAWA Kenichi

    東京都山間部の浄水所では降雨時の原水水質変動に伴い、一時的にフミン質に由来する消毒副生成物の生成量が水質基準値を超過するリスクを抱えている。そのため、フミン質の蛍光特性や除去について調査した。各浄水所の原水を３次元分光蛍光光度法により分析した結果、ほとんどの浄水所で蛍光特性が一致した。蛍光強度と色度及び消毒副生成物の生成能の間に高い相関があるため、生成能を推定する式を導出し、色度による生成量の制御 …

    Journal of Japan Water Works Association 89(1), 13-21, 2020

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  • EVALUATING POTENTIAL FLOOD MITIGATION EFFECT OF PADDY FIELD DAM FOR TYPHOON NO. 19 IN 2019 IN THE NARUSE RIVER BASIN

    CHAI Yikai , TOUGE Yoshiya , SHI Ke , KAZAMA So

    … <p> In recent years, to mitigate the flood disaster caused by the increasing intensity and frequency of torrential rain events, some places have adjusted the retention of the paddy field by installing the runoff control device called paddy field dam. … in October 2019 in the Naruse River basin using the Rainfall-Runoff-Inundation model. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 76(1), 295-303, 2020

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  • Ultra-high Resolution Numerical Weather Prediction with a Large Domain Using the K Computer. Part 2: The Case of the Hiroshima Heavy Rainfall Event on August 2014 and Dependency of Simulated Convective Cells on Model Resolutions

    OIZUMI Tsutao , SAITO Kazuo , DUC Le , ITO Junshi

    <p>　数値気象予測モデルの要素が豪雨のシミュレーションに与える影響を調べるため、広い領域を対象とした超高解像度実験を2014年8月の広島の豪雨事例で行った。本研究はPart 1 の2013年10月伊豆大島での研究に続くものであり同様の実験を行った。これらの研究から豪雨のシミュレーションにおいて広い領域で高解像度モデル（解像度500m以下）を用いる有用性を示した。</p>& …

    Journal of the Meteorological Society of Japan. Ser. II 98(6), 1163-1182, 2020

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  • Clausius-Clapeyron Scaling of Extremely Heavy Precipitations: Case Studies of the July 2017 and July 2018 Heavy Rainfall Events over Japan

    NAYAK Sridhara , TAKEMI Tetsuya

    <p>　極端降水の振る舞いを説明する上でのクラウジウス-クラペイロン（CC）スケーリングの有用性について、現在気候および疑似地球温暖化（PGW）条件で調べた。日本で発生した最近の2つの極端降水イベント、すなわち2017年７月５～６日の九州北部での豪雨および2018年7月５～８日の四国での豪雨を対象として、格子解像度１ kmでの領域気象シミュレーションにより解析した。数値シミュレーション …

    Journal of the Meteorological Society of Japan. Ser. II 98(6), 1147-1162, 2020

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  • STUDY ON FUTURE CHANGES IN PRECIPITATION DUE TO TYPHOONS USING SELF-ORGANAIZING MAPS  [in Japanese]

    SHIBATA Taiki , KODAMA Mitsuyoshi , IDE Yoshihiko , HASHIMOTO Noriaki , YAMASHIRO Masaru

    <p>　近年，2019年10月に発生した台風19号など，台風に伴う豪雨災害が発生している．さらに今後は地球温暖化に伴い，台風の強度が増すとともに台風による豪雨災害の甚大化が懸念される．本研究では，台風の常襲地帯であり，過去に幾度も水害を経験してきた九州地方を対象として，アンサンブル気候予測データベース(d4PDF)から抽出した台風の経路を自己組織化マップ(SOM)を用いてパターン分類し …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_1129-I_1134, 2020

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  • STUDY ON ESTIMATION METHOD FOR RAIN-ON-SNOW LOAD ON THE ROOF CONSIDERING CAPILLARY ACTION  [in Japanese]

    SAKURAI Daisuke , KOJIMA Shiryu , OTSUKI Masaya , KIKITSU Hitomitsu , ISHIHARA Tadashi , TAKAHASHI Toru

    … <p> In 2014, in the Kanto-Koshin region many buildings were severely damaged by heavy rainfall after snowfall, a phenomenon called rain-on-snow.</p><p> Hence, to estimate rain-on-snow load on the roof, we are proposing a two-dimensional snow cover model. … Second, the thickness of the outflow layer was obtained from the rainfall intensity, roof span, roof gradient and particle size. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(776), 1255-1262, 2020

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