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Characterization of water quality in a small hydropower plant reservoir in southern Brazil

机译：巴西南部一个小型水电站水库的水质特征

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摘要

The construction of large reservoirs can cause profound environmental changes. Reduced water flow, increased water residence time, thermal stratification, increased sedimentation rates and decreased dissolved oxygen concentrations are examples of such changes. These changes can affect water quality and the biota in the environments adapted to the natural conditions of a river. Small reservoirs developed in conjunction with hydropower plants, however, could reduce the degraded water quality. This study focuses on characterizing water quality in a small hydroelectric reservoir. The study reservoir has an area of 1.4 km2 and a short water retention time. The Monte Claro Hydroelectric Power Plant is part of a complex consisting of three plants on the Antas River in the north-west of Rio Grande do Sul state, Brazil. The reservoirs associated with these plants are operated as run-of-the-river facilities. Monitoring results obtained by CERAN, the Energetic Company of Antas River (Companhia Energe'tica Rio das Antas), were used to evaluate the reservoir water quality. Three samples were collected seasonally (spring, summer, autumn and winter) in the area of influence of this plant following the filling of the reservoir (2005-2008). The examined water quality parameters were electrical conductivity, colour, turbidity, alkalinity, pH, biological oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus, dissolved oxygen, sulphate, nitrate, nitrite, ammonia, suspended and dissolved solids, chlorophylkz, total and faecal coli-forms, water temperature and Secchi depth transparency. The results were interpreted using an index of water quality, Trophic State Index, reservoir water quality and CONAMA Regulation 357/05 (Brazilian legislation). Based on these analyses, no significant changes were exhibited in the water quality of the reservoir from the hydroelectric plant operation.
机译：大型水库的建设会引起深刻的环境变化。此类变化的例子包括水流量减少，水停留时间增加，热分层，沉降速率增加和溶解氧浓度降低。这些变化会影响水质和适应河流自然条件的环境中的生物群。然而，与水力发电厂一起开发的小型水库可减少水质下降。这项研究的重点是表征小型水电站的水质。研究水库面积为1.4 km2，保水时间短。蒙特克拉罗水力发电厂是由巴西里奥格兰德州西北部的安塔斯河上的三座电厂组成的综合体的一部分。与这些工厂关联的水库作为河流的上游设施运行。 CEANT，安塔斯河的能源公司（Companhia Energe'tica Rio das Antas）获得的监测结果用于评估水库水质。在水库装满后（2005-2008年），在该植物的影响区域按季节（春季，夏季，秋季和冬季）采集三个样本。检查的水质参数为电导率，颜色，浊度，碱度，pH，生物需氧量（BOD），化学需氧量（COD），总磷，溶解氧，硫酸盐，硝酸盐，亚硝酸盐，氨，悬浮液和溶解固体，叶绿素，总和粪便中的大肠菌形式，水温和Secchi深度透明度。使用水质指数，营养状态指数，水库水质和CONAMA法规357/05（巴西立法）对结果进行解释。基于这些分析，水电站运行后水库水质没有明显变化。

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