Challenge for Cool City Tokyo, Osaka Short introduction of there - - PowerPoint PPT Presentation

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Challenge for Cool City Tokyo, Osaka Short introduction of there - - PowerPoint PPT Presentation

Nov 26, 2023 159 likes •343 views

GSEP Workshop Washington DC Sep. 12-13 2011 Challenge for Cool City Tokyo, Osaka Short introduction of there estimated goal and the achievements of demonstration projects Toshiya Takahashi Director Standardization division 1 1

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Challenge for Cool City Tokyo, Osaka

1

Toshiya Takahashi

Director Standardization division

Short introduction of there estimated goal and the achievements of demonstration projects GSEP Workshop Washington DC Sep. 12-13 2011

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Topics

  • Policies & programs to promote Cool cities
  • Heat Island effect simulations(before/after counter measure)
  • How Tokyo and Osaka planed and promoting demonstration

projects

  • 2
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  • Heat-island effect was defined as a kind of Heat pollution by

Ministry of environment in 2001 in Japan.

  • General policy council has been organized for Anti-Heat

island effect by 3 major ministries in 2003. (METI,MLIT,MOE)

  • Preservation national low of urban green area: 2004

City code are widely introduced Thanks to the Kyoto protocol ,Japanese people like green roof gardens

  • Tax privileges

Related city regulations and agreements were proclaimed to encourage the individual land owners and building owners

  • Policies & strategy to promote Cool cities
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Earth Simulator and Landsat data can tell us environmental changes from large area to a very small area even in building by building.

Every major cities applying

this system to analyze heat-island effects to there environment.

Landscape data from agency of Land & geography

Sharing the best practice simulation model

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  • Osaka

Tokyo Nagoya Yokohama

Total Hot-air nights over 25 and there transition in major cities in Japan

Data from Meteorological Agency

  • Osaka shows steep increase than
  • ther cities.
  • Average Temperature of mid-summer

night in Osaka is much higher than Tokyo(~2)

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  • wards for H-I effect countermeasures

project area

  • promotion area
  • 23wards (Urban area of Tokyo city)
  • Heat island measures area in Tokyo

Data from 2008 Tokyo pref. Environmental agency report

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Wind-passage project in Tokyo station

  • Pulled down the old building

which blocked cool wind from Tokyo bay

  • Build new 2 buildings like a

gate pillars

Wind speed up after project

  • Tem. Drop after project

Pulled down Building Pulled down Building

Tokyo station

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  • Cool pavement effect

Time

Tem.drop at night

Tem.drop at noon Popular Pavement

Cool pavement Porous asphalt pavement Cool pavement

  • Tem. rise of pants surface after 10min. ( -4
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Simulation result for targeted area in Tokyo If we apply Cool pavement 100% for 23wards

Pilot project at Shibuya cross section -10

  • Popular pabement

Cool pavement

Data from 2010 Japan Cool pavement technical research council

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Accumlated Single year

  • Cool pavement application statistics in Japan

Data from 2010 Japan Cool pavement technical research council

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  • Application area analysis in Japan (2003~2010 accumulated)

Tokyo

Kanagawa Osaka

CHIBA

SAITAMA

Adjacent prefectures to Tokyo

Data from 2010 Japan Cool pavement technical research council

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6 AM 2 PM 8 PM

  • Heat accumulation in Tokyo city from 6am~ 8pm in mid summer
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Tem.drop distributions in central Tokyo

Green planting Cool pavements

Cool roof paint

Cut Car Exhaust gas

  • Tem. drop

wards area Core Area Cut building Heat Total effects

Simulation result after the total H-I countermeasures completion in 2040.

Data from 2008 Tokyo pref. Environmental agency report

Contribution %

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Green plant applicable Building roof(estimated)

Residential building

Business building

Residential building

Business building

  • Cool roof applicable Building roof(estimated)
  • wards

wards

Data from 2008 Tokyo pref. Environmental agency report

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Data from 2008 Tokyo pref. Environmental agency report

  • CO2 Gas reduction (T/year) VS Two measures induction rate

Spread rate Method Trial perio d (%) 0 . 0 4 0.11

  • G

r e e n planting Roof

  • C o o l r o o f

paint

  • t / year (-CO2)
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  • Heat-island countermeasures in Osaka City
  • Sourcedata: presentation of Osaka pref. Earth environment section

Goal

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Related regulations for large enterprise and building : 2006 1) Cut the exhaust heat from the factories submit planning and result report 2) A preventive measure for heat accumulation from the building submit planning report 3) Green planting for the building roof and its surroundings submit planning report

Sourcedata: presentation of Osaka pref. Earth environment section

  • Promotion of the countermeasures based on the regulations
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18 With out measure

Building energy cut

Exhaust heat cut from Car & factory Green planting for Land + 15% for Building roof +20%

Cool roof +60% Cool pavement 1 +30% Cool pavement 2 +20% (water penetration )

  • 3pm

5am

After introduce mixed countermeasures

  • 0.1~0.3
  • 0.3~0.9

3pm 5am

+0.1~0.2 +0.1~0.3

Sourcedata: presentation of Osaka pref. Earth environment section

  • Osaka H-I simulation results ( 2025 - 2010 )