Coherent Doppler lidar observation and numerical simulation of gap wind Kiyokawa-dashi in Japan

K. Sasaki, S. Ishii, K. Mizutani, H. Kanno, D. Matsushima, W. Sha, T. Iwasaki

研究成果: Conference contribution


This study presents the coherent Doppler lidar (CDL) observations and numerical simulations of local strong easterly wind Kiyokawa-dashi, which is most famous gap wind in Japan. Main goal of this study is to clarify the three dimensional structure and dynamics of Kiyokawa-dashi under the different synoptic situations. Observations were conducted in August 29 and 30, 2004. A 2μm eye-safe airborne CDL developed by the National Institute of Information and Communications Technology (NICT) established at the exit of the narrow valley of Mogami-River. The vertical scanning of CDL with the velocity-azimuth display technique shows that the easterly wind was confined below 600 m, which is almost same or slightly lower than the crest, and accelerated at the down stream side. The upper layer above the easterly wind was weak westerly and these vertical structures were common to the all of the events. Horizontal scanning sounds the line-of-sight (LOS) wind velocity up to 6 km of downstream and presents detailed temporal wind shift within 5-10 minutes. Numerical simulations have been performed with non hydrostatic atmospheric model (MRI-NPD NHM) with horizontal grid spacing down to 1 km. Many of the observed structures were realistically simulated, but it still has a bias that the detailed temporal evolution wasn't shown in the numerical simulation. The CDL captured the fine structure and temporal variations of Kiyokawa-dashi. It is a powerful and useful system for studying the wind field.

ホスト出版物のタイトルLidar Remote Sensing for Environmental Monitoring VII
出版ステータスPublished - 2006 12 1
イベントLidar Remote Sensing for Environmental Monitoring VII - Goa, India
継続期間: 2006 11 142006 11 16


名前Proceedings of SPIE - The International Society for Optical Engineering


OtherLidar Remote Sensing for Environmental Monitoring VII

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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