山区城市地质环境演化中包气带的二次污染机制

Secondary pollution mechanism of aeration zone in the environmental geological evolution of mountations cities

污染液在包气带中的作用机制，是城市地质环境污染控制研究中的一个重要环节，是人们关注的焦点。本次研究以长江三峡工程水库库尾段重庆等山区城市为典型实例，研究了包气带地质结构特征和污染现状。在室内开展了岩柱淋滤模拟试验，揭示了污染物在包气带中的作用机制。研究证明，包气带对污染物具的净化、聚焦和变异等多种功能，并在一定条件下可造成对环境的二次污染，它在城市生态环境演化进程中，具有重要意义。

The action mechainsm of pollutants in the aeration zone is an important link in the study of controlling over the pollution of urban geological environment and a focus of popular attention.This study,taking some mountainous cities in the tail part of the reservoir of the Three Gorges Project like Chongqing as typical examples,studied the geological structural features and pollution status of the aeration zone,conducted indoor modelling experiment on the infiltration through rock column,and revealed the action mechanism of pollutants in the aration zone.The study has shown that the aeration zone has the function to purify,gather and vary the pollutants and,under certain condition,cause a secondary pollution to the environment.It is of vital importance to the process of the urban eco environmental evolution.