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標題: 土壤轉換函數應用於水分特性曲線之研究
A Study of Pedotransfer Function Application for Estimating Water Characteristic Curve
作者: 林明毅
Lin, Ming-Yi
關鍵字: water characteristic curve;水分特性曲線;pedotransfer function(PTFs);van Genuchten Model;Principle components analysis;土壤轉換函數;van Genuchten Model;主成分分析
出版社: 水土保持學系所
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本研究以採集自台灣各地的22個土壤樣本進行分析,先進行基本土壤物理實驗及水分特性曲線之測定後,隨機選取其中12個土樣為實驗組,再將實驗數據代入van Genuchten Model中擬合出水力性質α與n。爾後利用複迴歸分析中之主成分分析法歸納出實驗組α、n值之迴歸式。並以剩餘10個土樣評估迴歸式之適用性,迴歸公式如下所示:
研究顯示參數ln(α)、ln(n)之判定係數為0.996、0.842,RMSE為1.333、0.093。在水分特性曲線之估算上,因採樣地點分散且在估計迴歸式時代入之土樣資料為隨機選取,並未依照質地分類, RMSE為0.021~0.063。比較前人迴歸式所得水分特性曲線,得之本研究對於不同質地之土壤其適用性較佳。

The soil water characteristic curves(SWCC) is one of the important soil hydraulic property, however the experiment is time-consuming. In recent years the scholars propose pedotransfer function one after another, predicting the soil water characteristic curve by using common property. To provide a convenient method for later study.
This study analysis 22 samples which were collected around Taiwan. Predicting the basic soil properties and soil water characteristics curve, 12 samples were chosen randomly as training set and estimate the hydraulic parameters α and n by curve fitting technique of the van Genuchten Model. Laters using principle components analysis summarize the regression of α and n in training set. The accuracy of the equations were validated by other 10 soil samples. The regression equations were as follows:
The results shows that the coefficient of determination (R2) of the parameter ln(α)、ln(n) of the estimating equations are 0.996 and 0.842. The root mean square error (RMSE) of parameter ln(α) 、ln(n) are 1.333 and 0.093 respectly, . In the estimation of water characteristic curve, the sampling location and the soil information were randomly chosen when validated the regression equation, the range of RMSE is 0.021~0.063. The applicability is better than previous study in different texture.
其他識別: U0005-2208201118011700
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