中文关键词土壤-水分配模型Hydrus-1D模型地下水稀释模型包气带六价铬镍 英文关键词soil/water partition equationHydrus-1D modelgroundwater dilution modelunsaturated zonechromium (Ⅵ)nickel

作者	单位	E-mail
林挺	深圳市环境科学研究院, 国家环境保护饮用水水源地管理技术重点实验室, 深圳 518001	linting2016@163.com
罗飞	深圳市环境科学研究院, 国家环境保护饮用水水源地管理技术重点实验室, 深圳 518001	luofei2006@qq.com
朱艳	深圳市环境科学研究院, 国家环境保护饮用水水源地管理技术重点实验室, 深圳 518001
杨坤	深圳市环境科学研究院, 国家环境保护饮用水水源地管理技术重点实验室, 深圳 518001
郗秀平	深圳市环境科学研究院, 国家环境保护饮用水水源地管理技术重点实验室, 深圳 518001

中文摘要 为合理推导基于保护地下水的土壤风险控制值和风险控制土方量，以珠三角某企业的电镀车间为研究区域，采用Hydrus-1D耦合地下水稀释模型构建水流和溶质运移方程，模拟六价铬和镍在包气带的迁移过程，并将计算结果与土壤-水分配耦合地下水稀释模型进行比较.结果表明，考虑包气带吸附作用下，Hydrus-1D耦合地下水稀释模型计算六价铬和镍的土壤风险控制值分别为41.6 mg·kg^-1和619.1 mg·kg^-1，与土壤-水分配耦合地下水稀释模型的计算结果相比，其风险控制值分别提高了近10倍和45倍，风险控制土方量分别减少1804 m³和44590 m³.对于地下水位埋深较浅、水力联系密切的污染场地，可进一步开展水文地质调查，完整考虑污染物在包气带的迁移过程，采用Hydrus-1D耦合地下水稀释模型推导基于保护地下水的土壤风险控制值，以节约后期治理修复或风险管控成本. 英文摘要 A combined Hydrus-1D and groundwater dilution model was employed to determine the risk control value and risk control volume of soil in correspondence of an electroplating workshop located in the Pearl River Delta. In particular, we considered the risk control value and risk control volume of soil in relation to characteristic chromium (Ⅵ) and nickel pollutants, which can affect the quality of groundwater. Based on the absorption of pollutants by the soil in the vadose zone, we obtained soil risk control values of 41.6 mg·kg^-1 and 619.1 mg·kg^-1 for chromium (Ⅵ) and nickel, respectively. These values were 10 and 45 times greater than those obtained from theoretical calculations (based on the soil/water partition equation combined with the groundwater dilution model), while the soil risk control volumes of chromium (Ⅵ) and nickel were 1804 m³ and 44590 m³, respectively. The soil risk control values calculated through the soil/water partition equation combined with the groundwater dilution model tend to be excessively conservative for the contaminated sites of the Pearl River Delta (characterized by a shallow buried depth of the underground water level and a close hydraulic connection); hence, it is necessary to carry out further hydrogeological surveys and fully consider the migration process of pollutants in the vadose zone. We conclude that the combined Hydrus-1D and groundwater dilution model for groundwater protection can be used to determine the soil risk control value, potentially saving the costs involved in later remediation and risk control.

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