期刊文献+

含水层非均质性对潜流带氮迁移转化的影响机制

Influence Mechanism of Aquifer Heterogeneity on Nitrogen Migration and Transformation in Hyporheic Zones
下载PDF
导出
摘要 潜流带的非均质性对生物地球化学过程具有重要的控制作用,然而现有的监测手段无法准确获取含水层的非均质结构。为揭示潜流带渗透系数非均质性对氮素迁移转化的影响,采用数值模拟手段构建了不同渗透系数场的二维潜流带水流和生物地球化学反应模型,探讨了潜流带渗透系数非均质性对水流交换、溶质迁移转化和硝酸盐去除的影响。结果表明:潜流带渗透系数非均质性的增加可能会导致河流-含水层间的潜流交换加快,影响潜流带内溶质分布和硝化、反硝化作用热点区域的分布;潜流带内渗透系数非均质性程度还会影响潜流带去除硝酸盐的能力,非均质性程度越高,潜流带的硝酸盐去除效率就越高。本研究结果可为地下水环境修复提供理论依据。 The heterogeneity of the hyporheic flow zone plays an important role in controlling the biogeo-chemical process.However,the heterogeneous structure of the aquifer cannot be accurately obtained by the existing monitoring methods.In order to reveal the influence of permeability coefficient heterogeneity of hyporheic zones on nitrogen transport and transformation,the two-dimensional hyporheic flow and biogeo-chemical reaction models with different permeability coefficient fields were constructed by numerical simu-lation,and the effects of permeability coefficient heterogeneity on water flow exchange,solute migration and transformation and nitrate removal were discussed.The results indicate that the increase of permeabili-ty coefficient heterogeneity within hyporheic zones may lead to the acceleration of hyporheic exchange be-tween rivers and aquifers,which affects the distribution of solutes and the distribution of hotspot areas of nitrification and denitrification within hyporheic zones.The degree of permeability coefficient heterogeneity within hyporheic zones also affects the ability of the hyporheic zone to remove nitrate.The higher the de-gree of heterogeneity,the higher the efficiency of nitrate removal in hyporheic zones.This study provides a theoretical basis for groundwater environmental remediation.
作者 凡倩莹 刘洋 冯永林 周继强 王全荣 FAN Qianying;LIU Yang;FENG Yonglin;ZHOU Jiqiang;WANG Quanrong(School of Environment Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;Shandong Institute of Geological Sciences,Jinan 250013,China;Technical Innovation Center of Mine Geological Environment Restoration Engineering in the Alpine and Arid Regions of Ministry of Natural Resources,Lanzhou 730000,China)
出处 《安全与环境工程》 CAS CSCD 北大核心 2023年第5期194-202,共9页 Safety and Environmental Engineering
基金 国家自然科学基金优秀青年基金项目(42222704) 湖北省自然科学基金项目(2021CFA089) 自然资源部高寒干旱区矿山地质环境修复工程技术创新中心开放课题基金项目(HHGCKK2104)。
关键词 非均质性 潜流带 氮素迁移转化 生物地球化学反应 数值模拟 heterogeneity hyporheic zone migration and transformation of nitrogen biogeochemical reac-tios numerical simulation
  • 相关文献

参考文献2

二级参考文献25

共引文献36

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部