1 0 0 0 OA 相似則に基づいた大気境界層における水平乱流構造の分類
- 著者
- 八木 綾子 稲垣 厚至 神田 学 藤原 忠誠 藤吉 康志
- 出版者
- 公益社団法人 土木学会
- 雑誌
- 土木学会論文集B1(水工学) (ISSN:2185467X)
- 巻号頁・発行日
- vol.70, no.4, pp.I_325-I_330, 2014 (Released:2015-05-18)
- 参考文献数
- 11
Horizontal turbulent flow fields within atmospheric boundary layer above an urban area (Tokyo, Japan) measured by Doppler lidar in autumn and winter were visually classified into six groups, Streak, No streak, Mixed, Fish net, Front, The others. The conditions of each flow occurrence were examined with observed surface meteorological data and related scaling parameters. The following results were obtained: (1)Streak dominates 64% of all valid data, while Fish net does only 2%. No streak and The others, look more laminar rather than turbulent, reach to 20% contribution in total. (2) Each flow patterns can be categorized by . and Re ( is boundary layer height, is the Monin Obukhov length. Re is Reynolds number, the length scale of which is .). (3) Each flow patterns can be categorized by . and Resurf (z is observation height. Resurf is Reynolds number, the length scale of which is .) as well as . and Re. (4) The diagrams of . and Re, and . and Resurf qualitatively illustrate the flow regimes.
1 0 0 0 OA 東京ー練馬ー埼玉ラインに見られる海風よどみ領域
- 著者
- 仲吉 信人 大久保 洸平 Alvin C.G.VARQUEZ 神田 学 藤原 忠誠
- 出版者
- 公益社団法人 土木学会
- 雑誌
- 土木学会論文集B1(水工学) (ISSN:2185467X)
- 巻号頁・発行日
- vol.69, no.4, pp.I_1741-I_1746, 2013 (Released:2014-03-31)
- 参考文献数
- 8
- 被引用文献数
- 1
This paper analyzed the behavior of sea breeze (hereafter SB) penetration to urban area in Kanto. In order to analyze SB penetration, we proposed a new method for SB-front detection using very high-resolution-geostationary satellite images, or MTSAT-2 Rapid Scan, with 1 km-spatial and 5 min.-temporal resolution. From the images, the detailed behaviors of SB were successfully visualized. For the selected SB events, the penetrations to in-land from Tokyo bay and Sagami bay were discussed using the point data of AMeDAS and Atmospheric Environmental Regional Observation System (AEROS), and also a result from the meso-scale simulation, where the important urban effects were parameterized (e.g., actual aero-thermodynamic parameters, anthropogenic heat and vapor emission). Along Tokyo-Saitama line, SB stagnation occurred in every sea breeze event. The observed higher air temperature and convergence resulted in increased vertical mixing, leading to SB stagnation.
