Study of heat and water-vapor transport by wind channel effect of urban river.

城市河流风道效应热量和水汽输送研究

• 批准号: 09650561
• 负责人: KANDA Manabu
• 金额: $ 1.98万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650561/
• 关键词: Wind channel effect; Sea breeze front; Heat island; Urban river; T-temp analysis

A river has the effect of climate alleviation as a not only cool spot but so called wind channel. Statistical analysis shows the penetration of sea breeze front over Kanto plane is classified into two cases, East or South-wind, influenced by synoptic wind condition. In these two cases the characteristics of the penetration of sea breeze front were investigated. Especially the result of meteorological field observation conducted along Arakawa-river, a typical urban river, shows that the river leads the sea breeze front to inland at South-wind match with river flow. Around secondary scale urban the penetration of sea breeze front are blocked over urban area because of heat island then the front may be surrounding there.Numerical simulation using RAMS (Regional Atmospheric Modeling System) including two advanced meteorological prediction techniques, FDDA (Four Dimensional Data Analysis) and Multi-grid nesting system, have been performed to investigate the wind field pattern along the river. The results agreed well with field observations, and the complex wind field along the river was simulated very well. As the results, following mechanisms were shown. 1. Wind channel effect is prominent when it is clear day and synoptic wind is calm in summer. 2. The penetration of sea breeze fronts is strongly influenced by the difference of roughness and heat balance between the river and the surrounding area. 3. In case that width of river is large, penetration at the surrounding area is blocked because the cold air is advected from river. 4. Local wind circulation accumulates the pollutants toward the river. The concentration is high at the front edge.

河流不仅是凉爽的地方，而且是所谓的风道，具有缓解气候变化的作用。统计分析表明，海风锋在关东平面上的侵彻受天气风条件的影响可分为东风和南风两种情况。在这两种情况下，对海风锋的穿透特性进行了研究。特别是对典型的城市河流荒川河进行的气象野外观测结果表明，该河流在南风与河流流量匹配的情况下，将海风锋引向内陆。在二级尺度城市附近，由于热岛的存在，海风锋的穿透被阻挡在城市上空，海风锋可能被包围在城市上空。利用区域大气模拟系统RAMS (Regional Atmospheric Modeling System)，结合四维数据分析（FDDA）和多网格嵌套系统两种先进的气象预报技术，进行了沿江风场的数值模拟。模拟结果与现场观测吻合较好，较好地模拟了沿江复杂风场。结果显示了以下机制。1. 夏季天气晴朗、天气风无风时，风道效应突出。2. 海风锋的穿透受河流与周边地区粗糙度和热平衡差异的强烈影响。3. 当河流宽度较大时，冷空气从河流平流而来，阻碍了周围区域的穿透。4. 当地的风环流将污染物积聚到河流中。前缘的浓度高。

项目成果

M.KANDA, O.NISHIMURA, T.FUKUDA and K.TAKEUCHI: "Characteristics of penetration of sea breeze fronts." J.of Hydroscience and Hydraulic Eng.16, [2]. 19-26 (1998)

M.KANDA、O.NISHIMURA、T.FUKUDA 和 K.TAKEUCHI：“海风锋面的穿透特性。”

神田学,井上裕史: "数値シミュレーションによる環八雲の再現性について" 日本気象学会1997年春季大会講演予稿集. 234- (1997)

Manabu Kanda、Hiroshi Inoue：“通过数值模拟再现八云环”日本气象学会 1997 年春季会议记录 234- (1997)。

福田忠弘,鹿島正彦,鈴木譲,神田学: "海風前線マップの作成による都市河川の海風効果の検証" 水工学論文集. (印刷中). (1998)

Tadahiro Fukuda、Masahiko Kashima、Yuzuru Suzuki、Manabu Kanda：“通过创建海风前沿图验证海风对城市河流的影响”水利工程杂志（1998 年出版）。

福田忠弘, 神田学, 西村修, 鵜野伊津志: "甲府盆地の風系タイプと汚染物質挙動" 日本流体力学会年会‘98講演論文集. 471-472 (1997)

Tadahiro Fukuda、Manabu Kanda、Osamu Nishimura、Izushi Uno：“甲府盆地的风系统类型和污染物行为”日本流体力学学会年会 98 论文集（1997 年）。

M.KANDA and T.KINOUCHI: "Application of a new outdoor thrmal sensation index" J.of Hydroscience and Hydraulic Eng.16. 27-34 (1998)

M.KANDA 和 T.KINOUCHI：“新的户外热感觉指数的应用”J.of Hydroscience andHydraulic Eng.16。