應用通量變異法與渦流相關法推估地表通量

Applying the flux variance method and the eddy covariance method to estimate surface fluxes

袁一夫(Yi-fu Yuan)

指導教授 ： 李明旭

國立中央大學/地球科學學院/水文與海洋科學研究所/碩士(2008年)

摘要

本研究應用渦流相關法與通量變異法來估算南投蓮華池測站的水氣與能量通量，並探討所推估通量的乾、溼季差異。分析渦流相關法之能量平衡，其誤差在可接受範圍，且乾季能量閉合度優於溼季的能量閉合度。應用通量變異法推估地表能量與水氣通量前，需先求得Monin-Obukhov相似性模型之溫度與水氣通用常數，分析結果之乾季通用常數皆大於溼季的通用常數。近一步分析能量與水氣之傳輸效率與大氣穩定度的關係，發現當大氣處於較不穩定狀態時，能量傳輸效率會普遍高於水氣的傳輸效率。最後比較渦流相關法與通量變異法所推估的通量，結果顯示通量變異法所推估的可感熱通量較接近渦流相關法估算的可感熱通量，而潛熱通量的差異則較大，且通量變異法所估算之可感熱通量高於渦流相關法所估算之可感熱通量。

關鍵字

通量變異法與渦流相關法

並列摘要

This study applied the eddy covariance method (ECM) and the flux variance method (FVM) to estimate water vapor and energy fluxes and discussed the differences of fluxes estimated in dry and wet seasons at the Lien-Hua-Chih (LHC) station, Nantou. The energy closure errors of ECM were acceptable and results of dry season were better than those of wet season. The universal constants for the Monin-Obukhov similarity theory should be determined prior to the application of FVM. In this study, the universal constants determined in dry season were greater than those in wet season. Under the condition of unstable atmosphere, heat transport was more efficient than water vapor transport. The discrepancies of sensible heat fluxes estimated by the FVM and the ECM are much smaller than those of latent heat fluxes, which the FVM tends to overestimate latent heat fluxes as compared with those by the ECM.

並列關鍵字

the flux variance and the eddy covariance method

參考文獻

56.魏谷州，「地表通量觀測與分析」，國立中央大學水文科學研究所碩士論文，2007。

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