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題名 | 大安溪河床揚塵對鄰近地區之影響評估=Evaluation of the Influence of Fugitive Dust Emissions from Da-An Riverbed on Nearby Regions |
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作者 | 林德貴; 王勝賢; 劉文宗; 黃隆明; | 書刊名 | 中華水土保持學報 |
卷期 | 43:3 2012.09[民101.09] |
頁次 | 頁239-254 |
分類號 | 443.64 |
關鍵詞 | 揚塵擴散; 揚塵模式; 揚塵排放率; PM10濃度; Dispersion of fugitive dust; FDM; Fugitive dust model; Emission rate of fugitive dust; PM10 concentration; |
語文 | 中文(Chinese) |
中文摘要 | 本研究選定大安溪出海口至義里大橋間之河段作為揚塵數值分析之研究區域,並採用揚塵模式(Fugitive Dust Model,以下簡稱FDM)來進行河床裸露地微粒土砂之擴散行為研究。再者,模擬結果亦顯示,入海口河段南岸之頂安村、大甲鎮、高鐵橋鄰近地區及義里大橋等四個地區為揚塵濃度較高值之區域,此與歷年揚塵嚴重區域現場調查結果作比較亦相當吻合。採用研究區域之現地氣象資料(風速及風向)以及室內風洞實驗求得之揚塵排放率與風速關係曲線,可進行大安溪河床裸露地之揚塵擴散行為模擬。同時,吾人可建置河床裸露地在各種氣象條件下之揚塵擴散潛勢影響圖。模擬分析求得之冬季PM10濃度值分布圖顯示,由於冬季偏北風之風速較大,使得裸露地具較大之揚塵排放量,並經擴散後造成南岸地區有較高之PM10濃度值。本研究亦針對不同河段(河段-1~河段-9)來進行河川揚塵貢獻量分析,其結果顯示,各河段對上述南岸四個地區之最高PM10日平均濃度主要貢獻為:頂安村87.12%揚塵來自河段-1之貢獻、大甲鎮38.72%揚塵來自河段-4之貢獻、高鐵橋鄰近地區41.05%揚塵來自河段-6之貢獻及義里大橋54.27%揚塵來自河段-9之貢獻。 |
英文摘要 | Influence charts for assessing the dispersion potential of fugitive dust of the riverbed of Da-An River under various meteorological conditions was established by a series of FDM (Fugitive Dust Model) simulations. The simulated distribution of annually average PM10 concentration at wintertime shows that the bare lands of the riverbed possess a larger emission quantity of fugitive dust due to the higher wind velocity of the northern monsoon in the year. In addition, the FDM simulations also indicate that the Ding-An village, the Da-Jia town, the neighborhoods of High Speed Rail Bridge, and the Yi-Li Bridge at the southern bank of the downstream reach are the main regions with higher fugitive dust concentration and which coincided with those observed in the past years. The highest daily average PM10 concentration for the four regions at the southern bank is mainly contributed by different reaches with different percentage as follows: 87.12% from Reach-1 for Ding-An village, 38.72% from Reach-4 for Da-Jia town, 41.05% from Reach-6 for neighborhoods of High Speed Rail Bridge, 54.27% from Reach-9 for Yi-Li Bridge. Conclusively, the Reach-1, Reach-4, Reach-6 and Reach-9 are considered as the most critical reaches with high potential of fugitive dust to the nearby communities at the downstream of Da-An River. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。