摘要
基于山西省汾河3个代表性断面处河道与滩地分层土壤中重金属铅含量的测定资料,分析了土壤铅含量沿河道与滩地横向及垂向的分布特征及其机理。结果表明:重金属铅在沿横断面的水平方向上,随着距离河道主槽水平距离增加,铅含量减小;与山西土壤背景值相比较,表层土壤、地下水位处土壤和深层土壤受污染河水的影响范围分别是距河道主槽100m,80m和60m;在河道垂向上,随着土层深度的增加,铅含量也呈下降的趋势,但在个别土层稍有起伏;在非饱和土壤中,其运移动力依次是对流作用,分子扩散作用,机械弥散;在饱和土壤中,运移动力依次是对流作用,机械弥散,分子扩散作用。
Based on the measured data of lead in the layered channel and its flooding land of three representative sections in Fenhe river of Shanxi province,the distribution characteristics of lead in both horizontal and vertical were analyzed and the mechanism was discussed.The results showed that the lead decreased with the increase of distance from the river main channel in horizontal direction.Compared to soil background value of Shanxi,the distance polluted by river water in the surface soil,the soil in groundwater and deep soil was 100 m,80mand 60mrespectively.In the vertical,lead content had a tendency of descending with increasing soil depth,but existed slightly ups and downs in individual soil.The order of migration dynamic of lead was convection,diffusion and mechanical dispersion in unsaturated soil and convection,mechanical dispersion and diffusion in saturated soil.
出处
《水土保持学报》
CSCD
北大核心
2013年第4期176-180,共5页
Journal of Soil and Water Conservation
关键词
河道
滩地
铅含量
运移动力
river channel
flooding land
lead content
migration dynamic
