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| 1 | 黄河上游十大孔兑冲积扇泥沙运动和沉积环境研究显示文摘泥沙的颗粒大小影响着泥沙的输移和淤积过程,而沉积物粒径组成反映了沉积环境的水动力条件。通过从十大孔兑下游冲积扇9个钻孔和1个沉积物剖面采集沉积物样品并进行粒级组成分析,采用矩法公式计算粒径参数,结合粒度参数散点图及C-M图解,分析搬运动力和沉积环境。研究结果表明:钻孔中所采集的样品主要沉积于河流环境。平均粒径主要分布在4.32Φ以下;分选主要在较差和差之间;偏度值均大于0;大部分样点的峰度值均大于4.5,样品粒度分布集中。除了哈什拉孔兑以外,十大孔兑下游淤积的泥沙搬运方式主要以滚动为主,滚动组分和悬浮组分相混合,孔兑之间的泥沙搬运方式不存在明显的空间差异。 | 阳辉 师长兴 | 2020 | 泥沙研究2020，，4： | 5 |
| 2 | Evaluation of geochemical behavior and heavy metal distribution of sediments:The case study of the Tirumalairajan river estuary,southeast coast of India显示文摘The purpose of this study was to assess the chemical partitioning of selected heavy metals(Fe,Mn,Cu,Zn,Pb,Cr,Co and Ni) in 10 surface sediments at Tirumalairajan River Estuary in the southeastern coast of India.A five-step sequential extraction technique was used to assess the environmental status of heavy metals.Most of metals were considered to be immobile due to the high availability in the residual fraction of heavy metals.The sediments of Tirumalairajan River estuary had not been polluted by heavy metals,and they didn't pose any high ecological risk.The seasonal variations of heavy metals were slightly higher in summer than in monsoon season.Factor analysis was also carned out to understand the associations of metals in different fractions with sand,silt,clay,organic matter,pH,salinity and other metals.The relationship between the Q-mode and R-mode cluster analyses was useful for identifying the pollution levels in both seasons.It was proved that the enrichment of heavy metals was related with geogenic and anthropogenic sources.The information on total metal concentrations in sediments was not sufficient for assessing the metal behavior in the environment,but the sequential extraction technique was more effective in estimating the environmental impact of contaminated sediments. | Senapathi VENKATRAMANAN Sang-yong CHUNG Thirunavukkarasu RAMKUMAR Gopalakrishnan GNANACHANDRASAMY Tae Hyung KIM | 2015 | International Journal of Sediment Research2015，30，1： | 2 |
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