| Project/Area Number |
02555117
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
KOIKE Toshio Nagaoka University of Technology, Depertment of Civil. Engineering, Associate Professor, 工学部, 助教授 (30178173)
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| Co-Investigator(Kenkyū-buntansha) |
SHIINA Toru Toyama National College of Technology, Department of Electrical Engineering, Ass, 工学部, 助手 (80196344)
MURAMOTO Kenichiro Kanazawa University, Department of electrical Engineering, Associate Professor, 工学部, 助教授 (70042835)
FUJIYOSHI Yasushi Nagoya University, Institute of Hydrological and Atmospheric Science, Associate, 大気水圏科学研究所, 助教授 (40142749)
SUITSU Takeshi Ministry of Posts and Telecommunications, Communications Research Laboratory, Se, 通信総合研究所, 主任研究官
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥16,600,000 (Direct Cost: ¥16,600,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥13,600,000 (Direct Cost: ¥13,600,000)
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| Keywords | remote sensing / radar / snowfall / maicrowave / doppler / polarization / ミリ波 / リモ-トセンシング / レ-ダ / 降雪観測 / 降雪機構 / 衛星 |
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| Research Abstract |
Radar rain gages, which are able to obtain the information on the spatial and temporal distribution of rain and snowfall, have been installed all over Japan. It is difficult to observe snowfall rate quantitatively because of the widerange variation of the characteristics of snow particles. This report aimed at developing a method of quantitative observation of snowfall using the radar system. The following conclusion can be drawn :
(a) The new Ka-band radar system was developed. It provided the information on the polarization characteristics of snow particles. The results of obsevations by using this system showed that the differential reflectivity ZDR was effective for classification into snowflake and graupel.
(b) The relationship between the radar reflectivity and the snowfall intensity were identified by measuring a set of values of the size distribution, the falling velocity, and precipitation rate at the ground by using CCD camera and the image processing method.
(c) Velocity measurements by using the CCD camera showed that the doppler radar was also effective for clasification of snow particles.
(d) Snowfall intensity was estimated quantitatively by measuring the radar reflectivity and falling velocity using the X-band doppler radar if the snow particles are classified.
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