Development of the Investigation-Numerical Simulation Method for Remedial Alternatives in Soil and Groundwater Contamination

含有废油和溶剂的废物造成的土壤和地下水污染是一个紧迫和关键的问题。为了有效地修复污染场地，根据调查结果和分析，选择合适的对策是非常重要的。在这项研究中，调查-数值模拟方法被开发为选择补救方案的基础技术。对该方法的有效性进行了评价。第一年，建立了污染场地的地理特征和地质条件的模拟方法，并对地下水流动和污染物运移进行了假设。结果表明，根据地形图、构造图和野外调查等资料，可以建立实际污染场地的示意图地理和地质模型。该模型用于下一阶段更详细的调查计划。第二年，三维数值模拟和…更多的研究应用于实际受污染的地点，在那里，第一和第二含水层是隔离的，污染物扩散到第二含水层。因此，对于二次含水层的地下水流动和污染物运移，我们必须用三维分析比半三维分析更详细地加以阐述。通过分析，提出了将三维数值模拟应用于实际污染场地的新方法，并通过一个“数据模型”阐明了调查、分析和对策之间的交叉关系。数据模型意味着从调查到对策的所有过程都可以系统化。特别是，建立了从调查到分析的详细数据模型。使用详细的数据模型，估计了一个非法减水点的污染物分布。在此基础上，建立了从调查到分析(地下水流动和污染物运移数值模拟)的全过程。这种新的调查方法--数值模拟方法被成功地发展成为选择补救方案的基础技术。较少

Soil and groundwater contamination caused by waste materials containing used oils and solvents is an urgent and crucial concern. To remedy the contaminated sites effectively, it is very important to select a proper countermeasure based on results of investigation and its analysis. In this study, the investigation-numerical simulation method was developed as a fundamental technology for selection of remedial alternatives. The effectiveness of the method was evaluated.In the first year, a modeling method for geographical feature and geological conditions at the contaminated sites was developed for making an assumption about groundwater flow and contaminant transport. It was shown that schematic geographical and geological models at the real contaminated sites could be developed, based on topographical map, tectonic map, field investigations and so on. The model was used for planing of more detailed investigations in the next stages.In the second year, three-dimensional numerical simulati … More on was aplied to the real contaminated site, where the first and second aquifers are in isolation and contaminants are spread to the second aquifer. Therefore, we had to exmaine the groundwater flow and contaminant transport in the second aquifer more in detail by the three-dimensional analysis than the semi-three-dimensional analysis. Through the analysis, a new procedure for application of the three-dimensional numerical simulation to real contaminated sites was developed.In the last year, the cross relationships among investigation, analysis and countermeasure were elucidated by a "data model". The data Model means that all processes from investigations to countermeasures could by systematiezed. In particular, a detailed data model from investigation to analysis was developed. Using the detailed data model, contaminant distributions were estimated at an illegal damping site. As a result, a method of developing the data model and its usefulness were confirmed.Consequently, procedures from investigation to analysis (numerical simulation of groundwater flow and contaminant transport) were developed. The new investigation-numerical simulation method was successfully developed as a fundamental technology for selection of remedial alternatives. Less