Search Results 1-20 of 70

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  • Study on Water Level Prediction Using Observational Data from a Multi-Parameter Phased Array Weather Radar

    Yoshimi Kazuhiro , Wada Masakazu , Hiraoka Yukio

    … <p>A dual-polarization, phased array weather radar, also known as the multi-parameter phased array weather radar (MP-PAWR), was developed by the Japanese Cross-ministerial Strategic Innovation Promotion (SIP) Program. … Since this weather radar has been made into an active phased array, three-dimensional observation of weather phenomena can be realized at high speed by means of electrical scanning in the elevation direction and mechanical scanning in the azimuth direction. …

    Journal of Disaster Research 16(3), 410-414, 2021

    J-STAGE 

  • INVESTIGATION OF A REAL-TIME RAIN FORECASTING USING U-NET  [in Japanese]

    金子 凌 , 小野村 史穂 , 仲吉 信人

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 65, Ⅰ_403-408, 2020

  • REPRODUCTION OF TYPHOON HAGIBIS USING WRF-ARW MODEL AND IMPACT ANALYSIS AGAINST CHANGE OF SEA SURFACE TEMPERATURE  [in Japanese]

    KITA Masato , QIAN Chaochao , KONOSHIMA Takehiko , NAKAYASU Masaaki , TSUJIMOTO Tetsuro

    <p> 令和元年東日本台風は東日本を中心に多量の降雨をもたらした.その中で,首都圏に位置する荒川下流域では氾濫危険水位付近にまで水位が上昇した.さらに大規模な降雨が発生した場合,下流での氾濫発生も懸念され,避難行動の基礎資料としてより雨量を増加させたデータが必要となる.本研究では,WRFを用いた海面水温操作による降水量の変化とその影響分析の結果と併せて,再現性の結果について報告する.そ …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 76(1), 189-201, 2020

    J-STAGE 

  • An Investigation of the Sensitivity of Predicting a Severe Rainfall Event in Northern Taiwan to the Upstream Condition with a WRF-based Radar Data Assimilation System

    Cheng Hsiang-Wen , Yang Shu-Chih , Liou Yu-Chieng , Chen Ching-Sen

    … at 14 LST.</p><p>Experiments are conducted to assimilate radial velocity only or both radial velocity and reflectivity data from radars at southwestern and southern Taiwan with the WRF-Local Ensemble Transform Kalman Filter Radar assimilation system. … Results show that these experiments can predict the rainfall occurrence in northern Taiwan, but the location and rainfall amount is very sensitive to upstream environmental conditions. …

    SOLA 16(0), 97-103, 2020

    J-STAGE 

  • USABILITY ASSESSMENT OF RAINFALL DATA WITH DIFFERENT SPATIAL RESOLUTION BASED ON OPTIMIZATION OF HYDROLOGICAL PARAMETERS  [in Japanese]

    MIYAMOTO Mamoru , MATSUMOTO Kazuhiro

    近年の降雨観測技術の向上により洪水氾濫を引き起こす集中豪雨の降雨強度や時空間分布を正確に捉えることが可能になり,それに伴って洪水予測の精度も向上している.しかしながら洪水予測の際には降雨データ等の入力データの他に,モデル構造やキャリブレーション等の誤差要因も挙げられる.本研究では土研分布モデルのパラメータを最適化した際の誤差の収束結果と河川流量の再現性に着目し,キャリブレーションに起因する誤差を最 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1345-I_1350, 2018

    J-STAGE 

  • Distributed Flood Predictions and Data Assimilation with Water Level Data including Small Rivers  [in Japanese]

    Sayama Takahiro , Miyake Shintaro , Yamamoto Kodai , Konja Atsuhiko , Takara Kaoru

    水災害に対する自治体の緊急対応や住民の安全な避難を実現するうえで、洪水予測は基本的なソフト対策の一つである。現行の洪水予報(指定河川洪水予報)は、主として河川水位の観測地点を対象に、今後数時間で河川水位がどのように変化するかを予測する。詳細な地形データやレーダ雨量の定量性の向上から、近年では分布型モデルを用いた洪水予測の実用化も進んでいる。ただし、現行の洪水予測には、以下の二つの課題が残されている …

    Proceeding of Annual Conference 31(0), 36, 2018

    J-STAGE 

  • Combining Radar and Rain Gauge Rainfall Estimates for Flood Forecasting : A Case Study in The Jinzu River Basin, Japan

    ADMOJO Danang Dwi , TEBAKARI Taichi , MIYAMOTO Mamoru

    地球環境研究論文集 = Global environment engineering research : 地球環境シンポジウム 25, 251-259, 2017

  • RESEARCH ON EARLY WARNING FOR MULTICELL CLUSTER STORM  [in Japanese]

    AZUMA Toshitaka , KATAYAMA Masayuki , NAKAKITA Eiichi

    ゲリラ豪雨と呼ばれる局地的豪雨が,首都圏で頻発している.道路交通管理の側面からも,災害リスクの事前回避に向けた先読み情報のニーズは高い.一方,長寿命で局地的豪雨をもたらすマルチセル型ストームは古くから注目されているものの,偏波レーダによる早期探知は未踏領域となっていた.そこで,本研究では京都大学防災研究所で開発されたゲリラ豪雨の早期探知の理論を土台とし,国土交通省により現業化されている高分解能偏波 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_223-I_228, 2017

    J-STAGE 

  • XRAIN RADAR ASSIMILATION WITH WRF FOR TORRENTIAL RAIN FALL IN HIROSHIMA IN 2014  [in Japanese]

    KITA Masato , KAWAHARA Yoshihisa , NYUNT Cho Thanda

    本研究では2014年8月広島豪雨を対象として,WRFモデルを用いたX-band MPレーダーデータの3次元変分法による同化実験を実施した.その結果,1時間雨量分布や累積雨量分布・量に関して,同化を行わない予測より良好な結果を得た.また,スレットスコアによる評価を行った結果,同化した場合において予測初期のスコアの改善が見られた.データ同化の効果として,動径風による下層・中層の風速場の修正や反射強度に …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_205-I_210, 2017

    J-STAGE 

  • Combining Radar and Rain Gauge Rainfall Estimates for Flood Forecasting: A Case Study in The Jinzu River Basin, Japan  [in Japanese]

    ADMOJO Danang Dwi , TEBAKARI Taichi , MIYAMOTO Mamoru

    …  Radar rainfall estimates are widely used for real-time flood forecasting. … An effective and accurate early warning system, with the assistance of radar rainfall estimates and hydrological modelling, is vital for reducing the effects of flood related-hazards. … Detailed spatial and temporal data on the distribution of rainfall over a wide range area can be provided by weather radar. …

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 73(5), I_251-I_259, 2017

    J-STAGE 

  • Forecasting developing stage of a line-shaped mesoscale convective system by ensemble assimilation of XRAIN  [in Japanese]

    Horiike Yosuke , Yamaguchi Kosei , Furuta Kohei , Nakakita Eiichi

    近年,線状メソ対流系による豪雨災害が日本各地で増加する傾向にある.このような豪雨災害の被害を減少させるためには,数値予報モデルを用いた高精度な予測情報が求められている.モデルを用いた短時間降水予測では,最適な初期値を与えることが予測精度向上に大きく影響する.そのため,データ同化は最適な初期値を与えるための有効な手法の一つである.線状メソ対流系の初期の同化による発達の予測はある程度成果が出始めている …

    Proceeding of Annual Conference 30(0), 25, 2017

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  • Forecasting a Line-shaped Mesoscale Convective System : the Dominant Scale and a First Attempt to Assimilate Hydrometeors in the Melting Layer  [in Japanese]

    山口 弘誠 , 堀池 洋祐 , 中北 英一

    … Initial condition is difficult to determine for Numerical Weather Prediction (NWP) of rainfall prediction. … Data assimilation (DA) using radar data is expected to improve the initial condition in the model. …

    京都大学防災研究所年報 = DPRI annuals (61), 533-554, 2017

    IR 

  • Numerical Experiments on Spatially Averaged Precipitation in Heavy Rainfall Event Using the WRF Model

    Sugihara Yuji , Imagama Sho , Matsunaga Nobuhiro , Hisada Yukiko

    … <p>It is difficult to forecast hourly rainfall locally even using the latest meteorological models, although hourly rainfall averaged spatially to some extent can be used for calculating practical rainfall. …

    Journal of Disaster Research 10(3), 436-447, 2015

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  • AVAILABLE APPLICATION STRATEGY OF RAINFALL INFORMATION FORECASTED BY X-BAND POLARIMETRIC RADAR FOR REAL TIME CONTROL OF URBAN STORMWATER MANAGEMENT SYSTEM  [in Japanese]

    KIDO Yoshinobu , SATO Go , NAKAKITA Eiichi

    … Urban flood problems have recently become severe, especially promoted by so-called guerrilla heavy rainfall, and water pollution problems in urban river derived from the non-point source also have continued since 1980s. … It requires the real time control of urban stormwater management system (RTCUMS) by using of rainfall forecasting information with some uncertainty. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 71(4), I_1345-I_1350, 2015

    J-STAGE 

  • DEVELOPMENT OF EARLY LOCAL HEAVY RAINFALL FORECAST TECHNIQUE AT OSAKA CITY

    NAKANO Toshio , SUZUKI Yasushi , MASUDA Aritoshi

    …  In Japan, flooding damage in urban areas caused by local heavy rainfall has increased in recent years. … It is of great importance to improve the precision of forecasting local heavy rainfall. … However, the present weather forecasting system cannot forecast the local heavy rainfall well in advance since local heavy rainfall has small scale and builds up suddenly. …

    Journal of JSCE 3(1), 140-147, 2015

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  • Applicability of the Adjoint Sensitivity-Based Data Assimilation Method: Radar Data Assimilation for Heavy Rainfall Cases over the Korean Peninsula

    Choi Yonghan , Lim Gyu-Ho , Lee Dong-Kyou

    … In this study, the usefulness of the Adjoint Sensitivity-based Data Assimilation (ASDA) method in assimilating radar data was investigated by comparing it with the Three/Four Dimensional Variational (3/4D-Var) method. …

    SOLA 11(0), 53-58, 2015

    J-STAGE 

  • Flood Prevention and Pollutant Reduction by Real Time Control of Urban Stormwater Storage System with Predicted Rainfall Information  [in Japanese]

    佐藤 豪 , 城戸 由能 , 中北 英一

    … Recently, some localized heavy rainfall events which are especially affected by global climate change causing urban flooding has brought a lot of disaster. … In this study, effectiveness of the real time control (RTC) of urban storage system for both purpose of flood prevention and pollutant reduction is estimated by continuous simulation with prediction of the latest RADAR precipitation system.. …

    京都大学防災研究所年報 = DPRI annuals (59), 323-359, 2015

    IR 

  • FLOOD FORECASTING MODEL IN THE DOWNSTREAM BASIN OF THE HII RIVER  [in Japanese]

    荒木 健 , 蛭田 啓久 , 中川 和男 [他]

    こうえいフォーラム : 日本工営技術情報 (22), 13-18, 2014

  • Development of Short-Term Prediction for Guerrilla Rainstorm based on State-Transition Method

    Inafuku Subaru , Tamaki Shiro , Hirata Teppei , Yamada Hiroyuki , Osawa Shingo

    … However, it is difficult to predict guerrilla rainstorm that occurs locally within widespread torrential rainfall. … We develop short term forecasting method of growth and disappearance phenomenon of rainfall that based on the fact that torrential rainfall tend to develop and disappear within the period of 30 minutes to 1 hour. …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2014(0), 297-302, 2014

    J-STAGE 

  • Numerical Experiment on Heavy Rainfall in Western Shimane Prefecture in August Using WRF-LETKF  [in Japanese]

    Kita Masato , Kawahara Yoshihisa , Tsubaki Ryota , Ushiyama Tomoki

    … また,早期に集中豪雨および豪雨災害を予測するシステムを構築するには,数値モデルのような予報時間が長い手法が有効であると考えられる<sup>1)</sup>.本研究ではWRF(Weather Research Forecasting model)を用いて,豪雨を事例とした数値実験を実施することで,そのモデルの精度の検証することを目的とする.また,数値モデルの課題である初期値鋭敏性を改善する手法として,局所アンサンブル変換カルマンフ …

    Proceeding of Annual Conference 27(0), 100045, 2014

    J-STAGE 

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