A comprehensive 3D-geospatial model was constructed based on extensive geological, geophysical, and chemical data using earthVision® (Dynamic Graphics, 1999). The geospatial model defines both the hydrostratigraphic framework and the 1,1,2,2-TeCA distribution at the site and is the framework for a 3Dgroundwater flow (MODFLOW) and contaminant transport (RT3D) models (McDonald and Harbaugh [1988], Clement [1998]). The 3D-geospatial model assisted the remedial design efforts by characterizing the primary hydrostratigraphic units and subsequently defined the model layers in MODFLOW. The geospatial model illustrates that the thickness of the surficial aquifer varies between 7 and 12 meters and the underlying first-confining unit extends continuously from the study area to beneath the Chesapeake Bay with no evidence of breaching by paleochannels.
依据大量的地质学数据、地球物理学数据和化学数据，采用earthVision®（动态图形，1999年版）建立起一个全面的三维地理模型。利用这个模型，即能够确定场地内的水文地层结构，也能确定1,1,2,2-四氯乙烷的分布情况，因此被用作三维地下水流动（MODFLOW）和污染物传播（RT3D）模型（麦克唐纳和哈伯[1988]、克莱门特[1998]）的基本框架。地层构造由三维地下水流动模型确定出来，而三维地理模型则保证治理方法符合主要水文地层构造单元的特点。地理模型显示出，地表含水层的厚度在7到12米之间，紧靠含水层的下方是第一限制层，从场地下方一直延伸到切萨皮克湾底部。这个限制层似乎没有被古河道切断。深圳英语翻译
The distribution of contaminants was modeled using 3D minimum tension interpolation techniques and integrated within the hydrostratigraphic framework (Schneider and Wrobel, 1998). The distribution of VOCs existing within the framework of the 3D-geospatial model was exported to the RT3D model and used to represent the initial conditions in RT3D. The geospatial model and existing hydrogeologic data were used to estimate both dissolved- and sorbed-phase contaminant mass (Table 1). 1,1,2,2-TeCA mass was also incorporated into the model to represent residual-phase materials that are suspected of feeding a local hot spot. Quantifying the contaminant mass enabled the project team to establish remedial goals by identifying the amount of VOC mass that requires removal.
评估污染物分布的模型，采用的是结合了水文地层结构（施奈德和洛贝尔，1998年）的三维最小张力插值技术。三维地理模型中的挥发性有机化合物分布情况，则用于污染物传播模型，代表污染物传播模型的初始情况。地理模型和现有的水文地质数据，用于估算污染物质的溶解相和吸附相（表1）。另外还将1,1,2,2-四氯乙烷代入该模型，用于估算可能进入局部热点的污染源残留相的数量。对污染物质进行定量以后，项目研究小组得到需要清除的挥发性有机化合物的数量，从而确定治理的目标。广州英语翻译
