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題 名 | E-[feed]紊流閉合的多層邊界層參數化之數值研究 |
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作 者 | 汪鳳如; | 書刊名 | 大氣科學 |
卷 期 | 20:3 1992.09[民81.09] |
頁 次 | 頁217-232 |
分類號 | 328.883 |
關鍵詞 | 多層邊界層; 紊流; 參數化; 閉合; 數值; 杞; PBL; Backward scheme; Forward Scheme; |
語 文 | 中文(Chinese) |
中文摘要 | E-ε方法為一最經濟的高階(一階半)紊流閉合方法,此方法僅增加二個預報變數項TKE(紊流平均動能)和ε(紊流平均動能消散率),用以參數紊流傳遞係數。包含E-ε多層邊界層參數化方法的單點模式,分別在穩度與不穩定二種熱力環境下測試,目的在瞭解E-ε方法使用向前顯性積分格式及向後隱性積分格式,在不同時間積分間距配置下的表現。測試結果顯示,向後積分格式其間距達600秒時引起之誤差,甚至小於向前積分格式配合150秒的結果。所以對要做長時間積分的全球模式而言,E-ε方法與向後積分格式的搭配,將是一比較有效率的組合。以此搭配和600秒的間距對實際MONEX 79實驗資料做模擬,並與Holt and Raman (1988)的結果相比,其對實際邊界層特性的掌握能力是可確認的,而因為向後積分格式的數值特性所造成之低估現象,則須與其他物理過程相連結後再進一步分析。 |
英文摘要 | In order to test the performance of E-ε method with different finite difference schemes and different time steps, numerical experiments are conducted using a PBL model with E-εturbulence parameterization. We compared numerical results with two different time schemes, the backward implicit scheme and the forward explicit scheme, as well as under thermal stable and unstable condictions. The numerical solution indicate that the truncation error resulted by the backward scheme with a time step of 600s is smaller than the resulted by the forward scheme with a time step of 150s. Therefore, it is suggested that the E-εmethod with the backward scheme will be much more effective for a global medium-range forecast model. In a real data simulation to compare with Holt and Raman (1988) results. We found that the E-εmethod with the backward scheme is able to describe the PBL features. But the scheme underestemates the fluxes due to the numercial feature of backward scheme. It will need advanced tests and analysis after model coupling with other physical processes. |
本系統中英文摘要資訊取自各篇刊載內容。