摘要
以流域水文模型SWAT为基础,初步构建了重金属在流域中迁移转化过程的模拟模块,包括重金属源输入、土壤中的迁移转化、河流和水库中随水沙的迁移过程。重金属化学形态按照液相水溶态和络合物结合态、固相活泼态和不活泼态设定,在水文过程中主要考虑前3个形态之间的平衡。应用该重金属模块对滹沱河上游流域中Zn的迁移转化进行了模拟,主要考察了典型半湿润半干旱区流域中"春末夏初持续干旱、汛期集中降水"的季节性特征加强时Zn流域输出变化。结果显示,在"加强系数"不超过1.1的条件下,Zn的出流量增加不会超过1个数量级。本研究为全球环境变化背景下重金属扩散所导致的环境风险的定量化研究打下一定基础。
This paper reports the preliminary result of an effort to develop a module, on the basis of SWAT system, to model the behavior of heavy metals in a watershed. Heavy metals＇ input, movement and transformation in soil, movement with water and sediment in river and reservoir were modeled in this module. Four heavy metals species, namely, labile species in solid, non-labile species in solid, soluble species in water, and ligand-bound species in water were considered and a balance between the former three was taken into account when modeling the movement of heavy metals with the flooding, infiltrating and evaporating proces- ses. The SWAT model lading the heavy metal module was used to simulate the output of Zinc in the upstream watershed of the Hutuohe river, which is a typical semi-humid semi-arid region characterized by its particular monsoon climate, i. e. , continuous drought in spring-summer period and concentrated rains in flooding season. The modeling result suggested that the watershed output of Zn would increase by no more than I order even when the aforementioned climatic feature was hypothetically elevated by 10%. Our study is regarded as a prospective initiative for a quantitative analysis of the environmental risk involving heavy metals＇ movement and spread under global climate change circumstances.
出处
《中国科技论文》
CAS
北大核心
2013年第5期458-464,共7页
China Sciencepaper
基金
高等学校博士学科点专项科研基金资助项目(20090003120016)
