Characterisation of bed sediments and suspension of the river Po (Italy) during normal and high flow conditions
Characterisation of bed sediments and suspension of the river Po (Italy) during normal and high flow conditions
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DOI：
10.1016/s0043-1354(03)00133-7
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发表时间：
2003-07-01
期刊：
影响因子：
12.8
通讯作者：
Dominik, J
中科院分区：
文献类型：
--
作者：
Davide, V;Pardos, M;Dominik, J
粒度分布，主要元素，营养盐和微量金属测定在床沉积物和悬浮液收集在10个代表性的站点沿着河Po在正常和高流量条件下。悬浮液的粒度分布和主要元素组成突出了两个不同的颗粒种群的存在下，在中上游宝（粗颗粒，较低的碳酸盐含量），并在较低的宝（细颗粒，较高的碳酸盐含量）。这种变化部分反映了盆地两部分之间的地质差异，以及Isola Serafini（皮亚琴察）水力发电厂的存在。关于环境质量问题，河床沉积物和悬浮物提供了类似的结果。中度营养污染，但在所有的河流流域的最高部分，而最重要的微量金属的输入似乎来自城市地区的都灵和米兰。沉积物富集因子的计算表明，Cd、Cu、Hg和Zn是受人类活动影响最大的元素。另一方面，高水平的镍和铬整个河流似乎主要来自基性岩的存在，在盆地的上部和中部。在高流量条件下，营养物和微量金属颗粒物的浓度都大大降低，这可能是由于污染床沉积物的“冲刷”和较粗物质的再悬浮。在正常流动条件下，水的水化学和一些元素（As，Ca，Cr，Cu，K，Mg，Mn，Na，Ni和Pb）的溶解相（< 0.45 μ m）的浓度也进行了测定。微量金属分配系数的计算表明，颗粒相和水相的相对重要性不同，响应水的水化学和悬浮固体含量，但大多数元素实现了条件平衡。波河的下游这些结果是第一个这种报告的整个河道，突出的因素和机制控制的起源，流动性和命运的营养物质和微量金属在河宝。(C)2003爱思唯尔科技有限公司。保留所有权利。
Grain-size distribution, major elements, nutrients and trace metals were determined in bed sediments and suspension collected at 10 representative sites along the river Po under normal and high flow conditions. Grain-size distribution and major element composition of suspension highlighted the presence of two distinct particle populations in the upper-middle Po (coarser particles, lower carbonate content) and in the lower Po (finer particles, higher carbonate content). This change partly reflects the geological differences between the two parts of the basin, and also the presence of a hydroelectric power plant at Isola Serafini (Piacenza). With respect to environmental quality issues, bed sediments and suspension provide similar results. A moderate nutrient pollution is found in all but the uppermost parts of the river basin, while the most significant inputs of trace metals appear to originate from the urban areas of Turin and Milan. Calculation of sediment enrichment factors identifies Cd, Cu, Hg and Zn as the most impacted elements by human activities. On the other hand, the high levels of Ni and Cr throughout the river seem to derive mainly from the presence of basic rocks in the upper and middle parts of the basin. Both nutrient and trace metal particulate concentrations substantially decrease under high flow conditions possibly due to "flushing" of contaminated bed sediments and resuspension of coarser material. Under normal flow conditions, water hydrochemistry and concentrations of some elements (As, Ca, Cr, Cu, K, Mg, Mn, Na, Ni, and Pb) in the dissolved phase (< 0.45 mum) were also determined. Calculation of trace metals partition coefficients shows that the relative importance of the particulate and water phases varies in response to water hydrochemistry and suspended solid content, but that most elements achieve a conditional equilibrium in the. lower stretches of the river Po. These results are the first of this kind reported for the whole river course and highlight the factors and mechanisms controlling the origin, mobility and fate of nutrients and trace metals in the river Po. (C) 2003 Elsevier Science Ltd. All rights reserved.