CFD analysis of mesoscale climate in the Greater Tokyo area

Abstract The results of CFD analyses of mesoscale climate in the Tokyo area are presented. Here, the model for geophysical flow problems developed by Mellor and Yamada is used for turbulence closure. In the first half of the paper, the accuracy of CFD analyses is examined by comparing their results with the measured data. The topography and present land-use situation in Japan are incorporated into the predictions by using the numerical data-base provided by the National Land Agency of Japan. For comparison, a computation which does not consider the effects of the distribution of land-use conditions at the present is also carried out. In the latter part, urban climates during the 1930s and the 1990s are analysed by the CFD method developed here. By comparing the results of these analyses, the effects of urbanization on heat island circulations over the Tokyo area are investigated.

[1]  Hans A. Panofsky,et al.  Determination of stress from wind and temperature measurements , 1963 .

[2]  Toshio Ojima,et al.  Changing Tokyo Metropolitan area and its heat island model , 1990 .

[3]  M. Hjelmfelt.  Numerical Simulation of the Effects of St. Louis on Mesoscale Boundary-Layer Airflow and Vertical Air Motion: Simulations of Urban vs Non-Urban Effects , 1982 .

[4]  B. Hicks,et al.  Momentum, heat and water vapour transfer to and from natural and artificial surfaces , 1973 .

[5]  Takashi Sasamori,et al.  The Radiative Cooling Calculation for Application to General Circulation Experiments , 1968 .

[6]  I. Uno.  Quantitative Evaluation of a Mesoscale Numerical Model Simulation Using Four-Dimensional Data Assimilation of Complex Airflow over the Kanto Region in Japan , 1996 .

[7]  R. Pielke,et al.  A comprehensive meteorological modeling system—RAMS , 1992 .

[8]  J. Kondo,et al.  Studies on the Bulk Transfer Coefficients over a Vegetated Surface with a Multilayer Energy Budget Model , 1992 .

[9]  S. Bunker,et al.  A Numerical Model Study of Nocturnal Drainage Flows with Strong Wind and Temperature Gradients , 1989 .

[10]  G. Mellor,et al.  A Hierarchy of Turbulence Closure Models for Planetary Boundary Layers. , 1974 .

[11]  Hiroshi Yoshik Ado.  Numerical study of the daytime urban effect and its interaction with the sea breeze , 1992 .

[12]  R. Pielke.  Mesoscale Meteorological Modeling , 1984 .

[13]  T. Ojima,et al.  Earth surface heat balance changes caused by urbanization , 1982 .

[14]  Fujio Kimura,et al.  The effects of land-use and anthropogenic heating on the surface temperature in the Tokyo Metropolitan area: A numerical experiment☆ , 1991 .

[15]  G. Mellor,et al.  Development of a turbulence closure model for geophysical fluid problems , 1982 .