環境政策評価のための船舶排出粒子状物質の大気拡散シミュレーションシステムの構築

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  • Development of Atmospheric diffusion simulator of particulate matter emitted from ships for environmental policy evaluation.
  • カンキョウ セイサク ヒョウカ ノ タメ ノ センパク ハイシュツ リュウシジョウ ブッシツ ノ タイキ カクサン シミュレーション システム ノ コウチク

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This study purposes the development of the simulator system which evaluates the effect of the reduction measure of PM emitted from ships.<BR>As a case study, the Tokyo Bay that has six ports in the area was selected. The area has been modeled on a 1km × 1km grid scale. Calculations were based on the off-shore and coastal dispersion (OCD) model, which is popular as one of simulation models to predict the dilution at sea.<BR>This paper also arranged estimate technique of the emissions from ships. It is important that the PM emission is accurately estimated, when environmental policy is considered. So detailed inventories of ship emissions in the area were developed and mapped onto shipping routes and ports, based on 1999's record. The total emissions of PM from ships in the area amount to some 437tons per year.<BR>The distribution of the PM concentration was calculated by the numerical simulation. The results indicate that the contribution of PM emissions from ships to the air quality on land should not be disregarded.

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