| Project/Area Number |
07555160
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
水工水理学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
IKEBUCHI Shuichi Kyoto University, Disaster Prevention Research Institute, Professor, 防災研究所, 教授 (20026181)
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| Co-Investigator(Kenkyū-buntansha) |
OISHI Satoru Kyoto University, Disaster Prevention Research Institute, Research Associate, 防災研究所, 助手 (30252521)
OHTA Nobuhito Kyoto University, Graduate School of Agriculture, Associate Professor, 大学院農学研究科, 助教授 (10233199)
NAKAKITA Eiichi Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (70183506)
MITSUTA Yasushi Kyoto University, Disaster Prevention Research Institute, Professor, 防災研究所, 教授 (90027219)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1995: ¥9,300,000 (Direct Cost: ¥9,300,000)
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| Keywords | Local Heavy Rainfall / Short Term Rainfall Forecast / Cloud Microphysics / Hydological and Meteorological Observation / GPS Meteorogy / Water Vapor Disturbance / Cumulus Scale / Severe Rainfall Prediction System / 水分・気象観測 / 水蒸気擾乱 / 積雲スケール / 雲物理モデル / ラジオゾンデ観測 / 地形 / 雹 / Xバンドレーダ / 非静力数値モデル / 陸面水文過程 / 水文素過程 / 都市化 |
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| Research Abstract |
In this project, investigators have proposed the severe rainfall prediction system as well as they have analyzed the local heavy rainfall. The analysis of local heavy rainfall has been done by twoapproaches. First, investigators observed several severe reinfall events mainly with radio sonde and rain gage under condition of severe rainfall in Baiu. Second, investigators developed a cumulus cloud model which has terrain following coordinate and detailed microphysics model. Using the model, investigators simulate severe rainfall events. The processes and result of the analysis is as follows ;
1) Hydrological and meteorological observations have been done under condition of severe rainfall which came mainly from Baiu fronts at the Kuzuryu river basin in Fukui Prefecture. Observation period is June 20-30,1996 and July 2-10,1997. Observations have been done with radio sonds (two to three hourly), optical and normal rain gage (once par one to ten minutes), car bone X band radar (continuous).
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) Numerical cumulus model which has detailed cloud microphysics have been computed with observation data as initial and verification data. Investigators analyze the effect of topography, wind field, atmospheric and thermodynamic stability and water vapor on cloud microphysical processes which control the cumulus generation and dissipation. As results of the analysis, investigators obtained results that the amount of hail generation is important factor for rainfall amount from cumulus. Moreover, they found that water vapor and vertical wind are important factor for hail generation.
3) Investigators proposed that GPS is suitable observation system for water vapor observation. Moreover, they developed a new equation system in order to obtain the water vapor disturbance of cumulus scale using GPS.Investigators found that the equation system made good results using numerical simulation data. They also investigated efficiency of the equation system using observed GPS data. Investigation found that the equation system is effective under good observation condition. They also found that the observation data are affected by many kind of error sources.
Finally, the vertical wind field observation by Doppler radar and water vapor observation by GPS are proposed as a effective observation system for severe rainfall prediction. Less
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