Characteristics of Precipitation Systems Analyzed from Radar Data over Bangladesh

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概要

• 論文の詳細を見る

• At present, a low-dense rain-gauge network over Bangladesh is the only tool by which to measure rainfall, so there is no way of understanding the properties of the precipitation systems occurring there. To obtain precise rainfall distributions and to clarify the characteristics of precipitation systems, radar data from the Bangladesh Meteorological Department (BMD) were used in the first investigation in Bangladesh. The BMD radar collects rain status data in six ranges. The precipitation rate was retrieved from the rain status obtained from BMD radar data. Correlation between three-days-running averaged rainfall estimated by radar and rain-gauges ranged from 0.63-0.89 over the months of 2000. The radar data was systematically underestimated by about one-fourth the rain-gauge value. Small size (〜80km^2) echoes contribute greatly to the total precipitation, but there were few large size echoes. The distribution of precipitation over Bangladesh obtained from radar data shows heavy precipitation in the northeast and southeast of the country, which is consistent with the rain-gauge rainfall data. Using the radar data characteristics of 185 analyzed convective systems, the development location, lifetime, shape, size, propagation speed, and direction were identified. The BMD radar data coverage (600km×600km) is divided into 3-regions : Northern, Central, and Southern, each being 600km east to west and 200km north to south. In general, precipitation systems develop in the Northern region and tend to move eastward. Precipitation system development in the Central and Southern regions is significant during the peak-monsoon months (June-August). Analysis of the radar data shows that the average time of maximum precipitation in the Northern region is 00-06 LST, in the Central region 06 LST and 15-18 LST, and in the Southern region 06-09 LST. The average lifetime of these systems is 〜5.7 hours. Movement speed is 〜5ms^<-1>.

• 日本自然災害学会の論文

著者

• Kikuchi Katsuhiro

  Department of Geophysics, Faculty of Science, Hokkaido University

• Islam Md.

  SMRC

• ISLAM Md.

  南アジア地域協力連合気象研究所

• Islam M

  Smrc

• Islam M

  Department Of Physics Bangladesh University Of Engineering & Technology

• Uyeda H

  Hokkaido Univ. Sapporo Jpn

• TERAO Toru

  Faculty of Informatics, Osaka Gakuin University

• ISLAM Md.

  Department of Life Science, Graduate School of Life Science, University of Hyogo

• Terao Toru

  Faculty Of Informatics Osaka Gakuin University

• Islamm M

  Saarc Meteorological Res. Centre

• Islam Md.

  Department Of Advanced Materials Science And Engineering Yamaguchi University

• Hayashi Taiichi

  Dpri Kyoto University

• HAYASHI Taiichi

  DPRI, Kyoto University

• UYEDA Hiroshi

  HyARC, Nagoya University

• ISLAM Md.

  秋田県立大学生物資源科学部

• Kikuchi Katsuhiro

  Department Of Biological Environment Akita Prefectural University

• Uyeda Hiroshi

  Hyarc Nagoya University

• Uyeda H

  Hydrospheric Atmospheric Research Center Nagoya University

• Uyeda Hiroshi

  Hyarc / Nagoya University

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