SIMULATION OF LOCALIZED HEAVY RAIN CONSIDERING THE LATEST URBAN PARAMETERIZATIONS

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  • NAKANO Kumiko
    Department of International Development Engineering, Tokyo Institute of Technology
  • NAKAYOSHI Makoto
    Department of International Development Engineering, Tokyo Institute of Technology
  • VARQUEZ Alvin C. G.
    Department of International Development Engineering, Tokyo Institute of Technology
  • KANDA Manabu
    Department of International Development Engineering, Tokyo Institute of Technology
  • ADACHI Sachiho A.
    Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
  • KUSAKA Hiroyuki
    Center for Computational Sciences, University of Tsukuba

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Other Title
  • 最新の都市パラメタリゼーションを導入した集中豪雨シミュレーション

Description

Urban localized heavy rainfall has become a serious issue especially during summer in the Tokyo metropolitan area. In order to analyze its relationship with urbanization, improved urban parameters were implemented into WRF together with high spatial resolution sea surface temperature (SST). For the simulation, the aerodynamic parameters such as roughness length and displacement height were prepared using a new feedback parameterization derived from large eddy simulations of real urban morphology. Applying the new urban parameterization realized a more accurate simulation of localized heavy rainfall. The stagnation of heat and water vapor around city, and also the delay of sea breeze caused by the drag of urban geometry, increased heavy rain in Tokyo.

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