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題 名 | 澎湖蒸發散量推估之研究=Evapotranspiration Estimation for Peng-Hu Area |
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作 者 | 黃隆明; | 書刊名 | 水土保持學報 |
卷 期 | 30:3 1998.09[民87.09] |
頁 次 | 頁241-249 |
分類號 | 434.222 |
關鍵詞 | 蒸發散; 熱收支法; Evapotranspiration; Heat balance method; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係以熱收支觀點推估澎湖之蒸發散量,當忽略土壤熱通量時,熱收支法 (Heat balance method)可寫為Q-I=LE+P,式中Q為地面太陽輻射量(Solar radiation)、I 為地面長波輻射量(Earthly radiation)、LE為潛熱通量(Latent heat flux)、P為顯熱通 量(Sensible heat flux);又Q與I可由雲量或經緯度推算,而LE與P則可由濕度及溫度推算 ,然後經由潛熱通量推估蒸發散量(Evapotranspiration, E),並將其值與實際蒸發皿蒸發 量(Pan evaporation, PE)相比較而得E/PE比值。經分析得知澎湖地區之E/PE值介於0.1∼ 0.7之間,而淨輻射量(Q-I)及蒸發散潛熱通量(LE)接近常態分佈,而顯熱通量(P)因水汽影 響,以致交換比率甚少且變化緩和;各熱收支項之年變化與亞熱帶季風氣候區的上海類似 。又從E/PE值可據以推估澎湖地區之蒸發散量,以供當地農業灌溉水量之決定及水資源營 運管理之參考。 |
英文摘要 | Evapotranspiration in Peng-Hu area was estimated with the heat balance model Q-I=LE+P, where Q is solar radiation, I is earthly radiation, LE is latent heat flux and P is sensible heart flux. The soil heat flux was considered negligible. Both Q and I were estimated from cloud amount or latitude, while LE and P estimated from humidity and temperature. The amount of evapotranspiration can then be calculated from latent heat flux. The range of E/PE ratio for Peng-Hu is 0.1 to 0.7 where E is evapotranspiration and PE is A-pan evaporation. The results indicate that the curves of Q-I and LE are close to normal distribution. Due to vapor effect, sensible heat is rather small. In Peng-Hu area, all patterns of the heat balance terms are similar to those expected in subtropical monsoon climate zone. The extimated the amount of evapotranspiration from E/PE may be used in irrigation amount decision, water resources operation and management. |
本系統中英文摘要資訊取自各篇刊載內容。