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首页> 外文期刊>Lakes & Reservoirs >Nutrient and heavy metal storage and mobility withinrnsediments in Kouris Reservoir, Cyprus
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Nutrient and heavy metal storage and mobility withinrnsediments in Kouris Reservoir, Cyprus

机译：塞浦路斯库里斯水库的营养和重金属储存及流动性沉积物

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The objective of this study was to evaluate the risks associated with nutrient and heavy metal pollution in the water andrnsediments of Kouris Reservoir in Cyprus, and to recommend applicable measures to alleviate them. The reservoir drainagernarea contains various historic abandoned copper mines existing in an ophiolite geological substrate. Kouris Reservoirrnwater is classified as oligotrophic to mesotrophic, with phosphorus being the limiting factor for algae growth. Thernthermal stratification of the reservoir enhances anoxic conditions in the reservoir hypolimnion, initiating phosphorusrnrelease back into the water column from the lake bottom sediments. The increased phosphorus release, in combinationrnwith increased water temperatures during the summer months (i.e. reaching 27 °C in August), may be the key factorsrnenhancing the growth of microbial communities and cyanobacteria blooms. The sediment of Kouris Reservoir is classifiedrnas ‘low risk’ on the basis of the Ecological Risk Index scheme, in contrast to the Geoaccumulation Index, which indicatesrna moderate degree of contamination for chromium (Cr), nickel (Ni) and copper (Cu), and a high degree for lead (Pb).rnHeavy metals are strongly bound to the sediment matrix at pH values between 7 and 9, but can be released back into thernwater column at potential acid pH values. In addition, the sediments exhibit a high copper and chromium absorptionrnaffinity under current water quality conditions in the reservoir, as shown by batch absorption experiments. The experimentalrnresults suggest dredging of the reservoir sediment, and its subsequent dumping of the sediments near influentrnstreams, would have adverse effects on the environment in the event of acid rain or other environmental changes thatrnmight acidify the sediment.
机译：这项研究的目的是评估塞浦路斯库里斯水库水和沉积物中与养分和重金属污染有关的风险，并提出减轻这些风险的适用措施。水库排水层包含在蛇绿岩地质基质中存在的各种历史悠久的废弃铜矿。库里斯水库被划分为贫营养型至中营养型，磷是藻类生长的限制因素。储层的热分层增强了储层低氧的缺氧条件，促使磷从湖底沉积物释放回到水柱中。磷释放量的增加，加上夏季月份水温的升高（即8月达到27°C），可能是增加微生物群落和蓝藻繁殖的关键因素。根据生态风险指数方案，库里斯水库的沉积物被归类为“低风险”，而地质累积指数则表明铬，铬，镍和铜的污染程度中等，重金属在7至9的pH值下牢固地结合到沉积物基质上，但在潜在的酸性pH值下可以释放回水柱中。此外，如分批吸收实验所示，在当前水质条件下，沉积物还表现出较高的铜和铬吸收亲和力。实验结果表明，如果发生酸雨或其他可能使沉积物酸化的环境变化，则疏the储层沉积物，以及随后将其倾倒在入流附近，将对环境产生不利影响。

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