Water Resources and Environmental Engineering Laboratory, 90014 University of Oulu, Finland.
Sci Total Environ. 2013 Sep 1;461-462:693-705. doi: 10.1016/j.scitotenv.2013.05.073. Epub 2013 Jun 14.
Transport of particulate pollutants in fluvial systems can contribute greatly to total loads. Understanding transport mechanics under different hydrological conditions is key in successful load estimation. This study analysed trace elements and physico-chemical parameters in time-integrated suspended sediment samples, together with dissolved and total concentrations of pollutants, along two agriculture- and peatland-dominated boreal river systems. The samples were taken in a spatially and temporally comprehensive sampling programme during the ice-free seasons of 2010 and 2011. The hydrochemistry and transport of particle-bound elements in the rivers were strongly linked to intense land use and acid sulphate soils in the catchment area, with arable, pasture and peat areas in particular being main diffuse sources. There were significant seasonal and temporal variations in dissolved and particulate fluxes, but spatial variations were small. Continuous measurements of EC, turbidity and discharge proved to be an accurate indicator of dissolved and particulate fluxes. Overall, the results show that transport of particle-bound elements makes a major contribution to total transport fluxes in agriculture-dominated boreal rivers.
河流系统中颗粒物污染物的输运对总负荷的影响很大。了解不同水文条件下的输运机制是成功进行负荷估算的关键。本研究分析了沿两个以农业和泥炭地为主的北方河流系统采集的时间积分悬浮泥沙样品中的微量元素和理化参数，以及溶解态和总污染物浓度。这些样品是在 2010 年和 2011 年无冰季节期间通过空间和时间综合采样方案采集的。河流中颗粒结合元素的水化学和输运与流域内密集的土地利用和酸性硫酸盐土壤密切相关，其中耕地、牧场和泥炭地尤其成为主要的扩散源。溶解态和颗粒态通量存在显著的季节性和时间变化，但空间变化较小。EC、浊度和流量的连续测量被证明是溶解态和颗粒态通量的准确指示物。总的来说，研究结果表明，颗粒结合元素的输运对农业主导的北方河流的总输运通量有很大贡献。
