重非水相液体（DNAPL）污染物对地下水环境安全造成极大危害，其在地球关键带中的运移过程一直是国际研究的前沿问题。受传统学科研究视角和方法的限制，国内外已有研究一般将DNAPL在关键带不同结构层中的运移过程割裂开来，尚未见将关键带作为一个整体开展针对性研究的报道，缺乏对关键带中DNAPL运移及其多元耦合过程的系统认识。本项目拟从水文地质角度概化我国平原区常见的典型关键带结构（包括非均质孔隙介质包气带、潜水含水层、承压含水层、基岩风化裂隙介质），构建典型关键带复杂结构的立体研究平台，室内物理模拟实验和数值模拟研究相结合，开展多学科交叉、多方法和不同尺度的系统综合研究，揭示DNAPL在典型关键带中入渗和溶出等运移多元耦合过程及其机理，实现DNAPL在平原区典型关键带中运移全过程的动态数值模拟预测，为定量评估DNAPL对关键带地下水环境的影响，并进一步提升地球关键带可持续服务功能提供科学依据。

The transport processes of DNAPL (Dense Non-aqueous Liquid) in Earth’s Critical Zone has been a worldwide hot issue in the field of groundwater pollution control, owing to great harm to the groundwater environment by DNAPL contamination. Limited by traditional research perspectives and methods, the transport processes of DNAPL in different structural parts of critical zone were studied separately in literature, and there has been no study yet targeting DNAPL transport based on the whole framework of critical zone. The existing research lacks a systematic understanding of DNAPL migration and its related multiple coupling processes in the critical zone. In this project, a research platform for typical critical zone will be constructed by generalizing the structure of typical critical zones in plain area of China from the perspective of hydrogeology, including heterogeneous porous media of vadose zone, phreatic aquifer, confined aquifer and fractured media of bedrock weathering zone. Through multi-scale, multi-approach interdisciplinary research including lab experiments and numerical simulation, the main object is to systematically study the multiple infiltration and dissolution processes of representative DNAPL in typical critical zone in the plain area, and to realize the dynamic numerical simulation and prediction of the whole transport processes of DNAPL. This research results will provide scientific basis for the quantitative evaluation of influences of DNAPL on the groundwater environment in critical zone, and further for the improvement of the critical zone sustainability.