THE EFFECT OF REALISTIC INITIAL LAND SURFACE STATE ON A LOCALIZED HEAVY RAINFALL IN TOKYO IN 2008

• SOUMA Kazuyoshi

  University of Yamanashi

• TANAKA Kenji

  Kyoto University

• SUETSUGI Tadashi

  University of Yamanashi

• TSUBOKI Kazuhisa

  Nagoya University

• SHINODA Taro

  Nagoya University

• SAKAKIBARA Atsushi

  Chuden CTI

• HASEGAWA Koichi

  Chuden CTI

• MOTEKI Qoosaku

  Japan Agency for Marine-earth Science and Technology

• NAKAKITA Eiichi

  Kyoto University

Bibliographic Information

Other Title

• 現実的な地表面状態量初期値が2008年に東京都で発生した局地的大雨へ与える影響

Abstract

Recently, localized heavy rainfalls over heavily urbanized areas have caused severe damage in Japan. On 5 August 2008, a localized heavy rainfall caused a rapid increase in drainpipe discharge, which killed five people working in a drainpipe near Zoshigaya, Tokyo. This study investigated the effect of actual land surface initial state on this localized heavy rainfall by two ensemble experiments using a cloud-resolving model that included precise urban features. The first experiment (ACTD) considered realistic initial land surface state derived from off-line land surface model calculation using meteorological observation provided by Japan Meteorological Agency. In the second experiment (CTRL), the initial soil moisture was set to homogeneously wet condition, and the initial land surface temperature was set to the same value as near surface air temperature. The amount of rainfall was significantly increased and close in the observed value over Tokyo at the beginning of rainfall in the ACTD experiment. The larger land surface temperature over urban area and larger soil moisture over surrounding area caused stronger contrast of surface heating in ACTD experiment. The contrast of surface heating caused the contrast of near-surface air temperature and intensified the convergence of horizontal wind and updraft over the urban area, and resulted in the larger amount of rainfall at the beginning of rainfall.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69 (4), I_343-I_348, 2013

  Japan Society of Civil Engineers

Keywords

• localized heavy rainfall
• cloud-resolving model
• initial land surface condition
• land-atmosphere interaction

Details

• CRID: 1390001205352050304
• NII Article ID: 130004558278
• DOI: 10.2208/jscejhe.69.i_343
• ISSN: 2185467X
• ISSN: http://id.crossref.org/issn/2185467X
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed