The Carlson’s (1977) Trophic State Index (TSI) is a widely employed tool to estimate the degree of eutrophication in a reservoir. In Brazil, the need of a classification system that would take into account regional characteristics employed adjusted indexes generated by data from reservoirs in the southeastern region of the country. Current research compares responses for Carlson’s TSI (1977) and its derivations for Brazilian reservoirs from data collected in the Pereira de Miranda Reservoir (State of Ceará, Brazil), and analyzes the influence of local conditions on results and their applicability to reservoirs in the semiarid region. TSIs were calculated by data on total phosphorus, chlorophyll a and water transparency. The reservoir was estimated as mesotrophic based on the chlorophyll a variable, and between eutrophic and hyper-eutrophic when based on total phosphorus data and water transparency. Results showed the need to consider intrinsic factors in the discussion on the applicability of TSIs to reservoirs in the semiarid region since the peculiar hydro-climatic conditions and morphometric characteristics make them even more vulnerable to disturbance agents, such as winds which have a significant influence on processes that determine the trophic state.
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机译：卡尔森（1977）的营养状态指数（TSI）是一种广泛采用的工具来估算水库中的富营养化程度。在巴西，需要一种考虑到区域特征的分类系统，该系统采用了根据该国东南部地区水库数据生成的调整后指标。当前的研究比较了从Pereira de Miranda水库（巴西塞阿拉州）收集的数据对卡尔森的TSI（1977）及其对巴西水库的推导的响应，并分析了局部条件对结果的影响及其对半干旱地区水库的适用性。地区。通过总磷，叶绿素a和水透明度的数据计算TSI。根据叶绿素a变量，将储层估算为中养型，而基于总磷数据和水的透明度，则将其估算为富营养型和超富营养型。结果表明，在讨论TSI对半干旱地区油藏的适用性时，有必要考虑内在因素，因为独特的水文气候条件和形态特征使其更容易受到扰动因素的影响，例如对风有重大影响的风。确定营养状态的过程。
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