Quantification of mass fluxes and natural attenuation rates at an industrial site with a limited monitoring network: a case study
Quantification of mass fluxes and natural attenuation rates at an industrial site with a limited monitoring network: a case study
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DOI：
10.1016/s0169-7722(02)00060-8
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发表时间：
2003-01-01
影响因子：
3.6
通讯作者：
Teutsch, G
中科院分区：
文献类型：
--
作者：
Bockelmann, A;Zamfirescu, D;Teutsch, G
在许多“真实的世界”现场，由于经济或地质原因，可用的监测威尔斯井的数量是有限的。在这样的限制条件下，很难进行可靠的现场调查，并量化的自然衰减（NA）的主要证据线，如污染物的质量通量在流动方向上的减少的文件。本研究报告的地下水调查结果，在前人工煤气厂位于第四纪河谷在西南德国。其位置、基础设施和含水层环境是德国许多工业区的典型特征。由于钻探条件困难（粗冰川河流砾石沉积和含水层上方的人为填充），只有12口监测威尔斯可用于调查和确定污染物羽流的位置。这些威尔斯井位于污染源向下梯度的三个控制平面（CP）上，每个平面沿着有四个威尔斯井。基于稀疏的监测威尔斯井集，采用不同的点尺度和一种新的整体调查方法，估算了苯、甲苯、甲苯、邻二甲苯、对二甲苯（BTEX）和低分子量多环芳烃（PAH）的现场尺度质量通量和一阶自然衰减速率常数。结果表明，即使在具有稀疏监测网络的非均匀场地，如果有可靠的流动模型或示踪剂试验数据，点尺度调查方法也可以提供可靠的场尺度自然衰减率信息。如果这些信息是不可用的，只有新的整体调查方法提出的稀疏监测条件下的污染物质量通量的量化可以得到足够的结果。(C)出版社：Elsevier Science B.V.
At many "real world" field sites, the number of available monitoring wells is limited due to economic or geological reasons. Under such restricted conditions, it is difficult to perform a reliable field investigation and to quantify primary lines of evidence for natural attenuation (NA), like the documentation of a decrease of contaminant mass flux in flow direction. This study reports the results of a groundwater investigation at a former manufactured gas plant situated in a Quaternary river valley in southwest Germany. The location, infrastructure and aquifer setting are typical of many industrial sites in Germany. Due to difficult drilling conditions (coarse glaciofluvial gravel deposits and an anthropogenic fill above the aquifer), only 12 monitoring wells were available for the investigation and localisation of the contaminant plume. These wells were situated along three control planes (CP) downgradient from the contaminant source, with four wells along each plane. Based on the sparse set of monitoring wells, field scale mass fluxes and first-order natural attenuation rate constants of benzene, toluene, ethylbenzene, and o-xylene and p-xylene (BTEX) and low molecular weight polycyclic aromatic hydrocarbons (PAH) were estimated utilizing different point scale and also a new integral investigation method. The results show that even at a heterogeneous site with a sparse monitoring network point scale investigation methods can provide reliable information on field scale natural attenuation rates, if a dependable flow model or tracer test data is available. If this information is not available, only the new integral investigation method presented can yield adequate results for the quantification of contaminant mass fluxes under sparse monitoring conditions. (C) 2003 Published by Elsevier Science B.V.