都市域の陸面パラメーターの算定

• 森脇 亮

  東京工業大学理工学研究科土木工学専攻

• 神田 学

  東京工業大学理工学研究科国際開発工学専攻

• 渡邊 倫樹

  東京工業大学理工学研究科土木工学専攻

• 松永 和章

  東京工業大学理工学研究科土木工学専攻

書誌事項

タイトル別名

• ESTIMATION OF LAND-SURFACE PARAMETERS IN URBAN BOUNDARY LAYER

抄録

Land-surface parameters of urbanized terrain are evaluated based on the field measurement data. Following results are obtained;(1) The value of momentum roughness length (Z₀) is 1.56m and it is greater than the heat roughness length (z_T) and water vapor roughness length (Z_q). The ratios kB_T^-1=ln (Z₀/Z_T) and kB_q^-1=ln (Z₀/Z_q) are 8.0 and 20.5 respectively.(2) The value of evaporation efficiency (β) is 0.05-0.2. After precipitation β is significantly decreasing with time for a few weeks. Evaporations from vegetation and concrete material are estimated respectively. Vegetation has a potential to emit latent heat as much as net radiation due to the oasis effect. Concrete material has a potential to cover the β variation range over residential area. When horizontal wind velocity is large, β is decreased.(3) The averaged value of albedo is about 0.13. When there is rainfall, albedo is decreased. But the value is back to about 0.13 within 2-3 days.

収録刊行物

• 水工学論文集

  水工学論文集 46 91-96, 2002

  公益社団法人 土木学会

キーワード

• Roughness length
• Evaporation efficiency
• Albedo
• Urban
• Field measurement

詳細情報

• CRID: 1390001205171611008
• NII論文ID: 130004043442
• DOI: 10.2208/prohe.46.91
• ISSN: 18849172
• ISSN: 09167374
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可