Experimental Study on the Wind Flow and Airborne Pollutants Dispersion Characteristics in the Coastal Complex Terrains ((I)

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基本資料

Project title

Code/計畫編號

NSC97-2221-E019-043

Translated Name/計畫中文名

海岸複雜地形之風場及廢氣污染物傳輸延散特性實驗分析(I)

Project Coordinator/計畫主持人

Bao-Shi Shiau

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=1695930

Year

2008

Start date/計畫起

01-08-2008

Expected Completion/計畫迄

01-07-2009

Bugetid/研究經費

1051千元

ResearchField/研究領域

土木水利工程

"我國海岸地形有些為丘陵類型，屬於複雜地形(complex terrain)，例如基隆地區之協和火力電廠、台北深澳火力電廠等位置所在之海岸區域皆屬於丘陵地形。受複雜地形之影響，使得風場紊流變化並造成污染擴散改變。因此對於海岸複雜地形區域之風場與污染近遠域延散特性之瞭解與掌握，將有助於提供該等人口稠密之海岸區域城市與農漁業區環境污染預警之參考。本計畫擬就海岸地區複雜地形之風場與廢氣污染延散特性，進行模擬試驗與分析研究。實驗研究結果將可獲得對於在海岸複雜地形之廢氣污染物排放之擴散影響與特性，有助於該類污染物造成之海岸環境污染災害風險評估研擬之參考。本計畫擬分三年期以實驗方式逐一進行模擬研究，探討海岸地區紊流邊界層作用下，海岸複雜地形之風場與廢氣污染延散特性。第一年進度，將探討海岸地區單一個地形不同斜坡角度之風場與紊流特性，包括有平均風速、紊流強度、雷諾應力、紊流頻譜等。由這些紊流統計及特性參數，進行分析單一個地形不同斜坡角度之風場變化特徵，並找出風場紊流與地形斜坡角度之關係式。第二年進度，則進行探討在海岸地區單一個地形不同斜坡角度之污染濃度場擴散，包括受到地形不同斜坡角度與紊流對擴散效應、沿煙流中心軸線之濃度垂直剖面與橫向剖面，並據以計算分析探討下洗、煙薰、排放煙流濃度變化、及擴散尺度，以瞭解受海岸地區複雜地形變化影響污染延散之效應。第三年則進行研究在海岸地區連續多個地形之風場與污染延散，分析探討內容包括：越過連續地形之風場變化(包括在地形各下游處之平均風速垂直剖面、紊流強度剖面、雷諾應力剖面)、廢氣污染濃度分佈、濃度剖面、最大濃度沿下游之衰減、以及擴散尺度等等之變化與地形間距變化之關係。並結合第一年及第二年結果，整理綜合歸納在海岸複雜地形之風場及廢氣污染物傳輸延散特性。" "Some coastal areas in our country are categorized as complex terrains. The accidents of continuous discharge of air pollutants from the chimneys of the power plants in these coastal areas may occur. As the gas pollutants discharge continuously, it may cause severe air pollution in the near urban region or agricultural region. Therefore, it is necessary to understand and predict the wind flow and air pollutants dispersion characteristics in the coastal region. The purpose of the present project is to study experimentally in the wind tunnel on the wind flow and air pollutants dispersion for different coastal topography. Results can be provided to assess the air environment for the coastal city or agricultural region in Taiwan. The project is scheduled to be executed for three years. The experiments will be carried out in the environmental wind tunnel to investigate the wind flow and air pollutants dispersion in the coastal region. In the first year, the wind flow and turbulence characteristics (including mean velocity, turbulence intensity, Reynolds stress, and turbulent velocity power spectrum) for the turbulent boundary layer flow past over the topography with different slopes. In the second year, we plan to inquire the downwash, fumigation of air pollutants and their dispersion characteristics in the coastal area of the topography with different slopes. For the third year, experimental measurements on the wind flow and air pollutants dispersion in the coastal region with continuous topography with various gaps will be performed. Results will be in conjunction with that of obtained in the first and second years, and they are analyzed to yield the characteristics of wind flow and air pollutants dispersion in the coastal complex terrain."

Keyword(s)

海岸複雜地形
污染延散
擴散尺度
紊流強度
紊流邊界層
coastal complex terrain
pollutant dispersion
dispersion scale
turbulenceintensity
turbulent boundary layer

DSpace CRIS

Experimental Study on the Wind Flow and Airborne Pollutants Dispersion Characteristics in the Coastal Complex Terrains ((I)

基本資料

Description