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題名 | 圓柱試驗在飽和土壤熱傳導係數之測定=Soil Column Experiment in Determining Thermal Conductivity for Fully Saturated Soils |
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作 者 | 方文村; 簡傳彬; | 書刊名 | 農業工程學報 |
卷期 | 50:1 2004.03[民93.03] |
頁次 | 頁63-71 |
分類號 | 434.22 |
關鍵詞 | 圖解法; 土壤熱傳導係數; 穩態熱流方法; Thermal conductivity for soils; Steady-state heat flow method; Graphical method; |
語文 | 中文(Chinese) |
中文摘要 | 本研究參考Bredehoeft & Papadopulos (1965)之方法,提出測定包和土壤熱傳導係數之解析圖解法。本2測定方法採用塑?、均質、飽和土壤圓柱實驗,實驗原則為利用熱流傳遞、水分流動皆達到穩態,本法係屬於穩態熱流方法之一。本研究使用桃園地區農田之表層土壤,有壤質砂土、砂質壤土、壤土三種土壤,土壤經過篩、重新裝填入圓柱,經實驗記錄圓柱滲漏水量及不同位置之土壤溫度。將土壤溫度正規化後,繪成一維分布圖,以圖解法比對得出Pecleet參數值,配合所觀測的穩定達西流速,計算可得所使用壤質砂土、砂質壤土、壤土之飽和土壤熱傳導係數測定結果分別為4.99×□、2.24×□、1.18×□cal/cm.sec.℃。本研究實驗室之方法可與Bredehoeft & Papadopulos (1965)提供之方法相輔相成達成量測野外地下水流動速率。 |
英文摘要 | This study proposes an analytical graphical method for use in the laboratory to determine thermal conductivity for fully saturated solid, in which the method by Bredehoeft & Papadopulos ) 1965 is referenced. The method is to be applied in isotropic, homogeneous, and fully saturated soils. It is required that steady state of water and heat flow is reached. The analytical graphical method is belonged to one of steady-state heat flow methods. The analytical graphical method is belonged to one of steady-sate heat flow methods. This study used surface soils in Taoyuan farm area and the three kinds of surface soils were classified as loamy sand, sandy loam and loam. The soils were sieved and repacked into test columns. Outflow rate and soil temperature at different locations were recorded during the experiment. Observations of soil temperature were normalized and plotted into one-dimensional distribution charts. The Peclet number is then determined by fitting the analytical curves in the charts. With the observed steady Darcy velocity for the soil column, the thermal conductivity for loamy sand, sandy loam and loam in the experiment is 4.99×□, 2.24×□, 1.18×□cal/cm.sec.℃, respectively. This analytical graphical method in laboratory along with the method by Bredehoeft Papadopulos (1965) can be used in estimating groundwater velocity in the field. |
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