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題 名 | Simulating Nonaqueous-Phase Liquid Transport in A Confined Aquifer by Using Sand-Tank-Tracer Tests=用砂槽示蹤劑試驗模擬非水相液體於受壓含水層中之傳輸 |
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作 者 | 簡錦樹; 黃英傑; | 書刊名 | 中國地質學會會刊 |
卷 期 | 38:2 1995.04[民84.04] |
頁 次 | 頁107-124 |
分類號 | 328.241 |
關鍵詞 | 示蹤劑試驗; 非水相液體; 鋒面前進方程式; 土壤水份; 相對滲透率; Tracer tests; Nonaqueous-phase liquid; Front advance equation; Soil moisture; Relative permeability; |
語 文 | 英文(English) |
中文摘要 | 本研究之目的乃利用砂槽示蹤劑試驗模擬非水相液體(nonaqueous-phase liquid)於 受壓含水層中之傳輸,在不同距離非水相液體鋒面所抵達的時間由土壤水份偵測器測出, 並用Willhite(1986)所改良之鋒面前進方程式(fronta1 advance equation)的解析模式比較 之。此模擬受壓含水層由一真徑9公分,長120公分內裝滿介於20-6號篩之飽和砂的壓克力 槽製成。槽內飽和砂中裝有八枝(每枝間距10公分)土壤水份偵測器,用來偵測在13, 23, 33, 43, 53, 63, 73, 83公分等不同傳輸距離之土壤水份變化。本研究示蹤劑試驗所使用的試劑為 非水相液體—四氯化碳,其由水槽之入口注入。 由實驗模擬與改良之鋒面前進方程式之比較結果,顯示較長的83公分傳輸距離及╱或在較 小的70 cc╱min注入水流率之下,誤差較小(1.48﹪),兩者接近於吻合;在較短的13公分 傳輸距離及╱或較大的115 cc╱min注入水流率之下,誤差則高達25.13﹪。這些誤差可能係 由下列造成: (1)實驗模擬時,非水相液體並非一活塞流(piston flow),在非水相液體鋒面未到達前 即有部份非水相液體為偵測器所偵測到,如此導致資料記錄器(Data Logger)所記錄的時 間較由鋒面前進方程式所計算的短。 (2)相對滲透率不能由實驗模擬直接量測得知,而需由相對滲透率與飽和度之分佈曲線讀 取,如此影響到前進方程式之精確度。 |
英文摘要 | The purpose of this research is to simulate nonaqueous-phase liquid (NAPL) transport in a confined aquifer by using sand-tank-tracer tests, in which the arrival times of the NAPL fronts at different distances were measured by soil moisture probes and com pared with the modified frontal advance equation of an analytical model by Willhite (1986). The simulated confined aquifer was made of a 9 cm-diameter and 120 cm-length arctic tank which was filled with saturated sands ranging from sieve nos. 20 to 60. The eight soil moisture probes, each 10 cm apart, were inserted horizontally into the tank and embedded in the saturated sands so that the changes in the soil moisture at different transport distances of 13, 23, 33, 43, 53, 63, 73 and 83 centimeters could be detected. The compared results from the laboratory simulation and the modified frontal advance equation show closer agreements (1.48% off) at the longer transport distance of 83 cm and/or at the smaller flow rate of 70 cc/min. However, the errors increase up to 25.13% at the shorter distance or 13 cm and/or at the larger flow rate of 115 cc/min. These errors may have resulted from anyone of the following: (1) In the laboratory simulation, NAPL was not of piston flow, and a few of the NAPLs were detected before the NAPL front arrived. This resulted in the times recorded by the data logger being shorter than those computed from the frontal advance equation. (2) The relative permeability could not be measured directly in the laboratory simulation. Instead, this was obtained from the distribution curves of relative permeability and saturation. This resulted in some inaccuracies in the chosen relative permeability as used in the frontal advance equation. |
本系統中英文摘要資訊取自各篇刊載內容。