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Redistribution of sediment and sediment-associated contaminants in the River Chern basin during the last 50 years

机译:过去50年里陈河盆地的沉积物和与沉积物相关的污染物的重新分布

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A detailed study was undertaken in the upper part of the River Chern basin (126 km~2). An integrated approach was used to investigate the redistribution of sediment and sediment-associated contaminants within the upper part of the basin, upstream from the reservoir located in the middle reach of the main valley. It was found that maximum sheet, rill and gully erosion rates were observed during the 1960s. This led to increased erosion rates in all parts of the fluvial system. The intensity of erosion decreased considerably after 1991 for a number of reasons. The commencement of mining activity and the sharp increase in the application of chemical fertilizers caused detectable heavy metal pollution within the basin during the late 1950s and early 1960s, when the Mikhailovsky iron ore mining development started. As a result, concentrations of Zn and As in floodplain sediment increased and exceeded the maximum permissible levels, according to Russian human health standards.
机译:在Chern盆地上游(126 km〜2)进行了详细的研究。一种综合方法被用来研究沉积物和沉积物相关污染物在盆地上部,位于主要山谷中游的水库上游的重新分布。发现在1960年代期间观测到最大的片层,小溪和沟壑侵蚀速率。这导致河流系统所有部分的侵蚀率增加。 1991年以后,由于多种原因,侵蚀的强度大大降低。 1950年代末至1960年代初,当Mikhailovsky铁矿石开采开发开始时,采矿活动的开始和化学肥料的使用急剧增加导致盆地内可检测到重金属污染。结果,根据俄罗斯人类健康标准,洪泛区沉积物中锌和砷的浓度增加并超过了最大允许水平。

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