基于Van Genuchten-Mualem模型的土壤包气带中PbZn迁移规律研究  

Research on Transition Regulation of PbZn in Soil Water Belt based on Van Genuchten-Mualem Model

作　　者：麻勇 张静 郭宸麟 Ma Yong;Zhang Jing;Guo Chenlin(Chongqing Jiao Tong University,College of Hehai,Chongqing 400074,China)

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《环境科学与管理》2022年第9期54-59,共6页Environmental Science and Management

基　　金：水力学与山区河流开发保护国家重点实验室(四川大学)开放基金项目(SKHL2012);重庆交通大学科研启动基金项目(2020020036)。

摘　　要：针对重金属在土壤包气带垂直迁移问题,文章采用Van Genuchten-Mualem模型控制土壤包气带水分,一维非饱和溶质运移方程控制污染物迁移,基于MGWT软件模拟土壤包气带中重金属迁移过程。研究结果表明,(1)土壤包气带-50 cm、-175 cm、-350 cm处的污染物分别在第216天、1046天及3203天达到峰值,其中Pb的峰值分别为2.956 mg/kg、2.044 mg/kg及1.58 mg/kg,Zn的峰值分别为13.79 mg/kg、9.54 mg/kg及7.37 mg/kg;(2)在100天、365天、1000天及3650天时,土壤包气带中在-20 cm、-80 cm、-170 cm及-340 cm达到峰值,其中Pb的峰值分别为2.33 mg/kg、1.78 mg/kg、1.67 mg/kg及1.24 mg/mg,Zn峰值分别为10.89 mg/kg、8.30 mg/kg、7.81 mg/kg及5.78 mg/kg。Aimed to the transition regulation of heavy metals in soil water belt,the Van Genuchten-Mualem model and one-dimensional solute transport models were proposed to simulate the heavy metal transport.The results show that(1)the maximum concentration of pollutants underground-50 cm,-175 cm and-350 cm respectively occurs on 216 days,1046 days,and 3203 days.The maximum concentration of Pb were respectively 2.956 mg/kg,2.044 mg/kg and 1.58 mg/kg.These of Zn were respectively 13.79 mg/kg,9.54 mg/kg and 7.37 mg/kg.(2)on the 100 days,365 days,1000 days,and 3650 days,the maximum concentration of pollutants appeared underground-20 cm,-80 cm,-170 cm and-340 cm.The maximum concentration of Pb were respectively 2.33 mg/kg,1.78 mg/kg,1.67 mg/kg and 1.24 mg/mg.These of Zn were 10.89 mg/kg,8.30 mg/kg,7.81 mg/kg and 5.78 mg/kg,respectively.

关 键 词：土壤包气带 Genuchten-Mualem模型 垂向迁移 峰值 

分 类 号：X53[环境科学与工程—环境工程]