Using Multi-packer system in the Well to Process Groundwater Thre-dimesion and the time Flew of Four-dimensional Change Research of the Contaminated Site

[[abstract]]目前國內在有關地下水監測的部分，仍多以全開篩監測井設置配合傳統式採樣方法進行水質監測，以致獲得之地下水為混合數個不同深度後之樣品，除無法反映前述地下環境真實狀況外，亦無法掌握地下環境隨時間變化之情形。藉由對污染場址進行傳統通井取樣與近代封隔取樣之地下水質差異的研究，以污染物的垂直分佈、濃度、範圍 以及時間的序列等地下環境資訊，進行場址四維組態模型之建立，而試驗過程中將以井體積置換、微洗井、雙封隔系統以及多封隔系統等四種監測方式作觀察，以期對於各監測方式應用於此類型場址上之監測結果的差異做這一步的了解，並依據監測結果探討對於污染場址的適用性。 在相隔一週的第九與第十次採樣結果中，從場址垂直濃度分佈的相關性來看，井體積置換、微洗井與雙封隔系統的水質結果，在濃度的垂直分布趨勢中，皆有往下遞減的情形，而MIP調查的結果則是往下逐漸遞增，由濃度分佈的趨勢可以發現，明顯無法對污染分層的狀況做有效的連結，且兩次的採樣數據中，也凸顯了傳統通井取樣與雙封隔在多深度的採樣需求下，所產生的水質差異可能會造成對場址污染的錯誤評估。而多封隔系統則是在無設置深度轉移的情形下，取得較符合場址垂直分布的水質結果，同時也因為短開篩的採樣變異較小的特性，在四種方式的採樣結果中，取得偏差較小的水質數據。 另外，經由初步的場址調查後，在配合多封隔系統於場址內的設置，再從場址四維時間的空間濃度轉變中，可看出場址經整治設施的有效運作後，地下污染區塊逐步受到改善的情形，由於本次試驗場址屬高滲透性地層，所以較能凸顯其多封隔系統的特性，若在場址的應用選擇上屬低滲透特性地層的類型，則不建議做此系統應用於場址中的選擇。[[abstract]]Currently part of the relevant groundwater monitoring is still mostly full screen monitoring well with conventional sampling methods for water quality monitoring so that access to groundwater mixed after several samples at different depths in addition to the aforementioned underground environment does not reflect the real situation the also unable to grasp the changes over time in the underground environment situations On contaminated sites by the traditional and modern through wells sampled packer sampling study of groundwater quality differences the vertical distribution of pollutants concentration range and time series and other underground environmental information for the site of the four-dimensional configuration model establishment while the volume during the test wells will be replaced micro wash well dual packer system and multi-packer system and other four monitoring methods for observation monitoring methods to be applied for this type of site on the difference between the results of the monitoring do this step to understand and based on monitoring results investigate the applicability of the contaminated sites In the ninth and tenth week apart sampling results the vertical concentration distribution from the site relevance of view well volume replacement micro wash well with dual packer systems for water quality results the vertical distribution of the concentration trend Individually descending down the situation while the MIP survey results are down gradually increasing a trend by the concentration distribution can be found obviously unable to make effective pollution hierarchical link status and the two sampled data it is also highlights the tradition through wells sampled with a double packer demand in a multi-depth sampling the resulting water quality differences may result in an inaccurate assessment of contaminated sites And multi-packer system is set up in the absence of the transfer case depth to obtain more in line with the vertical distribution of site quality results but also because of the short opening screen features a small sampling variability in four ways sampling results water quality data obtained deviation smaller In addition through the preliminary site investigation in line with multi-packer system was set up within the site from site concentration of four-dimensional space time changes you can see the appearance after remediation site after the effective operation of facilities underground polluted gradually improve the situation by block since this is a testing ground for addressing high permeability formations so better able to highlight its multi-packer system characteristics if the application in site selection is a low-permeability formations type it is not recommended This system is applied to the site to do the selection Keywords: multi-packer system four-dimensional spatial variation change contaminated site