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應用時頻分析於潮汐邊界場址之地下溶質傳輸評估

Applying Time-Frequency Analysis to Solute Transport Evaluation within Tide Boundary

摘要


正確有效地評估溶質在地下環境中的擴散與傳輸,是土壤及地下水污染控制及整治行動前的重要工作。然而在受到鄰近河海潮汐或人工抽汲影響時,將使該區域的地下水流動趨勢非常不穩定,地下溶質之傳輸更形複雜難以預估。本研究於Y場址篩選15口地下水監測井,以自記式水位計長期監測地下水位。並利用時頻分析方法計算地下水變動週期,研究發現該場址含有日、月、年之震盪週期及不規則雜訊。本研究整合場址地下水之週期震盪,進行場址邊界水位設定及溶質傳輸之模擬。根據實場驗證結果,發現場址地下水於乾季及雨季將發生流場變化,且溶解相存在年震盪效應,該現象將影響整治效率評估,需審慎考量避免高估整治效率。

並列摘要


The Fate and transport assessment of solute in subsurface is very important for groundwater pollution control and remediation. Tidally or manually induced head fluctuation can cause an unstable flow regime and a complex solute transport. Current evaluation of solute transport for groundwater remediation would be problematic for these tidally affect boundaries. This study conducted a complete field groundwater monitoring of 15 wells in Y field. A simulation integrating tidal boundary from time-frequency analysis to forecast the flow regime and solute transport was conducted and verified with field data. The groundwater flow regime was found to be different in dry and wet seasons. The tidal fluctuations caused the annually concentration oscillation in Y field. We suggest that the tidal effect be considered for designing field remediation.

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