紫色土小流域浅层井水中胶体颗粒的季节变化

发布时间：2018-10-21 17:46

【摘要】：胶体是多种污染物迁移进入地下水的主要载体.为探究地下水中胶体颗粒的长期动态变化及影响因素,对川中丘陵区紫色土小流域浅层井中胶体颗粒浓度及井水理化性质进行了1 a的原位观测.结果表明:浅层井水中胶体颗粒含量存在较强的季节变异(CV0.5),胶体颗粒质量浓度峰值可达到14.68 mg·L~(-1)(相应的数量浓度为1.34×109L~(-1)),出现在非雨季,由人为取水扰动所致.雨季中前期大雨产流的物理扰动能有效增加井水中胶体颗粒浓度,后期暴雨的促进作用不明显.井水化学性质(EC、Ca2+、Mg2+、DOC)是影响胶体颗粒浓度动态及存在形态最重要的因素.该地区作为饮用水源的浅层井在雨季中前期可能受到因增加的胶体颗粒输入而辅助迁移的农化物质(如农药、P等)对井水质量安全的威胁,建议加强该时段内降雨后井水中胶体及井水理化性质的监测.
[Abstract]:Colloid is the main carrier for the migration of many pollutants into groundwater. In order to investigate the long-term dynamic changes of colloidal particles in groundwater and their influencing factors, the concentration of colloidal particles and the physical and chemical properties of well water in shallow wells of purple soil small watershed in the hilly area of central Sichuan were observed in situ for 1 year. The results show that there is a strong seasonal variation (CV0.5) of colloidal particle content in shallow well water, and the peak value of colloidal particle mass concentration can reach 14.68 mg L ~ (-1) (the corresponding quantity concentration is 1.34 脳 10 ~ 9 L ~ (-1), in non-rainy season, which is caused by the disturbance of human fetching water. The physical disturbance caused by heavy rain in the middle and early rainy season can effectively increase the concentration of colloidal particles in well water, but the effect of rainstorm in the latter stage is not obvious. The chemical properties of well water (EC,Ca2, Mg2, DOC) are the most important factors affecting the concentration dynamics and the morphology of colloidal particles. The shallow wells in this area, as drinking water sources, may be threatened by agricultural chemicals (such as pesticides, P, etc.), which are assisted by the increased input of colloidal particles during the middle and early rainy season, to the quality and safety of well water. It is suggested to strengthen the monitoring of the physical and chemical properties of colloid and well water in well water after rainfall in this period.
【作者单位】：重庆工商大学旅游与国土资源学院;中国科学院水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(21307152) 四川省“百人计划”项目(142)
【分类号】：X523

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