- 作者: 曠永銓; 張能復
- 作者服務機構: 國立台灣大學環境工程研究所
- 中文摘要: 本文以一典型山谷中都市為例,模擬討論在大氣靜風狀況下,臭氧煙陣的特徵。模式包含空氣動力方程組及大氣擴散反應方程式。結果顯示:午間都市上空之輻合氣流,為原生污染物及臭氧煙陣傳輸之控制機制。輻合氣流之位置取決於上游山後之小尺度輻合。新的臭氧煙陣在下游山前與前一天舊的臭氧煙陣結合。結合過程中,下游山區的存在阻絕了輻合補注氣流所帶來之乾淨空氣,因此造成山谷地形較平坦地形容易累積生成高濃度臭氧。
- 英文摘要: This paper models the idealized stagnant conditions for a postulated urban area in a typical valley topoint out the significant features of the ozone plume. Two step modeling including the hydrodynamicmodel and the reaction-diffusion model is taken as the approach method.The results show that theconvergence of flow over thd urban area is the control mechanism of pollutant transport and ozone plumeformation. The location of this convergence is affected by the small scale convergence in the sheltered sideof the valley. The newly generated ozone plume is merged into the old plume formed by former dayprecursors of ozone accumulated in the aloft region of the downwind mountain. The process of merging isless affected by the supply clean air than those cases without leeward mountain because the airflow isobstructed by the mountain.
- 中文關鍵字: ozone plume; valley terrain; hydrodynamic effects; photochemical smog
- 英文關鍵字: --