摘要
黑河中游张掖盆地地表水和地下水均遭受不同程度的硝酸盐污染。选取了黑河中游河水和地下水相互作用带中典型剖面,研究了河水和地下水相互作用对硝酸盐污染物迁移过程的影响,分析了控制硝酸盐从地下水向地表水迁移的因素及途径。结果表明:河水和地下水相互作用带中物理混合过程对硝酸盐浓度分布的影响明显,氧化还原过程等化学作用对其影响不显著;河水与地下水的补排关系及其强度控制着硝酸盐的迁移过程。基于该研究结果,选用二元混合模型计算了河水与地下水相互作用带中不同位置处的混合比例,定量分析了河水混合作用对地下水中硝酸盐浓度的影响。
The surface water and groundwater at Zhangye basin in the middle reaches of Heihe River in Chi na have both suffered from nitrate concentrations in different degrees. This paper selects a typical cross sec- tion from the river water and groundwater interaction zone in the middle reaches of Heihe River, investi- gates the effects of interaction between the river water and groundwater on the transport process of nitrate pollutants, and then analyzes the factors and pathways of the nitrate transporting from groundwater to sur- face water. The results show that the physical mixing processes have significant impacts on the nitrate con- centration distributions,while chemical reactions such as redox reactions have little impact, and the ex- change relationship and its intensity between the river and groundwater control the nitrate transport. Based on these results,the paper applies a bivariate mixed model to calculating the mixing ratios of groundwater to river at different positions of the interaction zone and quantitative analyzes the influence of mixing effect of river water on nitrate concentrations in groundwater.
出处
《安全与环境工程》
CAS
2016年第1期40-46,共7页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41002081
91325101
91125009)
关键词
河水和地下水作用带
硝酸盐污染
混合作用
黑河中游
river water and groundwater interaction zone
nitrate concentrations
mixing effect
middle rea-ches of Heihe River
