Scaling of turbulence inurban surface layer using boundary layerheight

使用边界层高度缩放城市表层湍流

• 批准号: 22360198
• 负责人: MORIWAKI Ryo
• 金额: $ 12.23万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22360198/
• 关键词: 境界層; 乱流; 都市気象; フラックス; ヒートアイランド; 雲; 大気境界層; 熱収支; ゲリラ豪雨; 都市気候; 相似則

The main interest in this study is the relationship between boundary layer height and the urban surface turbulence and energy balance. We investigated the effects of differences in land use on the formation of clouds, using the summer time datasets from the observations of cloud base level, solar radiation, surface heat flux, air temperature and humidity. The followings are main outcomes.Cloud base level over urban area was higher than that over rural area when wind blew along the border of the abrupt change of land use. Solar radiation over urban area tended to be smaller than that over rural area in the afternoon of sunny days. This was demonstrated by the spatial distribution of water vapor and the development of mixing layerestimated from surface heat flux. Absolute humidity in urban area tended to be lower in comparison with that in rural area. Therefore, the urban dew-point temperature also became lower than that in rural area. As a result, the urban lifted condensation level(LCL) was also lower. The spatial difference of LCL qualitatively coincided with that of observed boundary layer. This indicates that the surface water vapor distribution affected the formation of cloud aloft. In addition, the mixing layer height was estimated from the accumulation of surface heat flux. The estimation shows that the convection developed upward beyond LCL and this is more prominent in urban area. The estimation supports the observation where cloud in urban area tended to develop higher than rural area.

本研究的主要兴趣是边界层高度与城市表面湍流和能量平衡之间的关系。我们利用从云底高度、太阳辐射、地表热通量、空气温度和湿度观测得到的夏季数据集，研究了土地利用差异对云形成的影响。主要结果如下：风沿土地利用突变边界吹时，城市地区云底水平高于农村地区。晴天下午，城市地区的太阳辐射往往小于农村地区。水蒸气的空间分布和根据表面热通量估计的混合层的发展证明了这一点。城市地区的绝对湿度往往低于农村地区。因此，城市露点温度也低于农村地区。因此，城市提升凝结水位（LCL）也较低。 LCL 的空间差异与观测到的边界层的空间差异定性一致。这表明地表水汽分布影响了高空云的形成。此外，混合层高度是根据表面热通量的累积来估计的。估算表明，拼箱区外对流向上发展，且在城市地区更为突出。该估计支持了城市地区云发展趋势高于农村地区的观察结果。

项目成果

The characteristics of spatio- and temporal-variation of rainfall in Matsuyama plain

松山平原降雨时空变化特征

• 发表时间: 2012
• 期刊: Journal of Hydroscience and Hydraulic Engineering
• 作者: Fujimoto;M.;Watanabe;K.;Moriwaki;R.
• 通讯作者: R.

重谷祐樹,松山平野におけるヒートアイランドの特性とメカニズムの解明

Yuki Shigetani，松山平原热岛的特征和机制的阐明

• 发表时间: 2011
• 作者: Nakagawa;H.;Mizutani;H.;Kawaike;K.;Zhang;H. and Yoden;T. and Shrestha;B.B;森本一行,森脇 亮,藤井恵人
• 通讯作者: 森本一行,森脇 亮,藤井恵人

水循環モデルを用いた樹種の違いが松山平野の水収支に及ぼす影響の解析

利用水循环模型分析不同树种对松山平原水平衡的影响

• 发表时间: 2010
• 作者: 田川耕平;,森脇 亮
• 通讯作者: ,森脇 亮

瀬切れによる河川表面水の消失が河川近傍の温熱環境に及ぼす影響

河流悬崖导致河流地表水流失对河流附近热环境的影响

• 发表时间: 2012
• 期刊: 土木学会水工学論文集
• 作者: 西脇彩香;他;森脇亮・亀井祐紀・藤森祥文
• 通讯作者: 森脇亮・亀井祐紀・藤森祥文

都市スケールモデルおよび水田上の境界層乱流の類似性に対する建物アスペクト比の影響

建筑纵横比对城市尺度模型与稻田边界层湍流相似性的影响

• 发表时间: 2010
• 作者: Fujii;S;藤井恵人,森脇 亮
• 通讯作者: 藤井恵人,森脇 亮