滨海地下水交互带中的胶体运移行为研究综述

A review of colloid transport behaviors based on coastal groundwater interaction

在分析国内外已有研究的基础上,综述滨海地下水交互过程中的胶体运移规律,重点阐述咸淡水驱替作用下胶体的宏观运移规律和微观作用机理。胶体在滨海地下水交互中可成为联系海-陆相的物质传输纽带,其运移行为主要受地下水水化学参数波动影响,受控于胶体类型与数量、表面电位及地下水p H、离子强度等因素,具有水动力、水环境多因子联合作用的特征,并在含水层中具有空间堵塞和团聚体结构改变的不确定性。未来关于滨海地下水交互带中的胶体行为研究应重视基础勘察,考虑胶体群体效应,结合滨海含水层对水动力、水化学条件的敏感性,研究胶体在多相体系中胶体运移的不确定性及其对污染物的协同运移作用,为滨海资源化研究构建统一分析体系和预测机制。

Based on the typical properties of coastal aquifer along with characteristics of groundwater interaction,multiphase reactive transport incorporating colloidal behaviors are presented. Specifically,this paper clarifies the mechanism of colloid behaviors driven by seawater-freshwater displacement from the macroscopic and microscopic perspectives. The findings suggest that the colloid is the link of mass transfer between terrestrial and oceanic facies. Hydrochemical variation in groundwater influence colloid transport behaviors,which are controlled by a combined effect of multiple factors. Such factors include colloid type and quantity,surface potential,groundwater p H,and ionic strength,with uncertainties of size exclusion and structural aggregation during transport. The future challenge lies within the co-transport of colloid and pollutant in the multiphase system from microscopic dimension to field scale,within which the colloid population effect during the displacement together with the aquifer sensitivity to hydrodynamic and hydrochemical conditions being the key factors. Finally,in this review,the useful foundation is put forward for longterm pollution control and resource reuse in coastal areas.