Becker, VanessaMoreira, Caio Vitor Matos2023-01-042023-01-042022-07-29MOREIRA, Caio Vitor Matos. Impactos de eventos climáticos extremos na qualidade da água de corpos hídricos superficiais continentais. Orientador: Vanessa Becker. 2022. 52f. Dissertação (Mestrado em Engenharia Sanitária e Ambiental) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/50835Extreme climate events (ECEs) related to precipitation, such as extreme droughts and extreme rains, have great potential to alter the water quality of continental water bodies, due to climate change these events have become more frequent, making these phenomena important threats to these environments that play various roles in our society. In this sense, understanding how these events impact continental water bodies in temporal and spatial scale is an important tool for management and mitigation of these future impacts. Therefore, the aim of this study is to find temporal and spatial patterns of these effects and understand how particularities at local scale can amplify the impacts of extreme climate events. For this we developed in our first chapter a systematic review using scientometrics, which is the branch of science that proposes to study aspects of scientific production, aiming to understand trends and gaps in an area of science. In the scientometric analysis we extracted the following information from each article: type of study event, climatic zone of the study area, approach, ecosystem studied, type of parameter studied, biological communities (when there is a biological study), impact on the main parameter, and impact on water quality. 281 publications were used for the temporal production analysis of studies and for the remaining analyses we removed the review articles, resulting in 254 articles. We observed an increase in publications on the subject from the year 2014, we found that the temperate climate zone is the one that produces the most articles, rivers are the most studied ecosystems and the vast majority of these studies report negative impacts on water quality in these environments. Moreover, these events cause relevant ecological changes due to the physical-chemical changes superimposed on these water bodies. We understand that this increase in the number of studies has been caused by publications of international reports on climate change and ECEs, the regional pattern of publications is more related to scientific production in these locations than the higher occurrence of ECEs in the regions. ECEs are capable of introducing and increasing concentrations of solids, nutrients and various pollutants. These events also intensify the eutrophication process, the magnitude and duration of these impacts are controlled by watershed characteristics and antecedent conditions of these water bodies. In our second chapter we used 10-year monitoring limnological data (2011-2021) to analyze the impact of water level fluctuation during a prolonged drought under a Brazilian semiarid reservoir, in which at the beginning of the dry period it presented high water volume and had its depth progressively decreasing until it completely dried up, with subsequent reinundation at the end of the monitoring period. The aim of this chapter was to verify if the drought period intensified the eutrophication of this reservoir. We used cluster analysis to separate into clusters the months of monitoring and Kruskall-Wallis and Principal Component Analysis (PCA) to analyze the differences between periods and environmental variables. Our cluster analysis divided into three periods characterized by their maximum depths (Zmax) as: intermediate (I), dry period (II) and wet period (III). The variables: suspended solids (fixed and volatile), turbidity, electrical conductivity, orthophosphate, total phosphorus and chlorophyll-a presented lower values during the wet period (III), while Secchi transparency and dissolved oxygen concentrations observed in the shallowest periods (I and II) were lower when compared to period III. Thus we could see the degradation suffered by the reservoir during the prolonged drought and that during the periods of lower water levels we had degradation of the water quality and aggravation of eutrophication. We conclude from this study that precipitation ECEs negatively impact continental water bodies and these impacts alter the physical, chemical, and biological dynamics of these ecosystems. Moreover, the environmental conditions of the drainage basin where these water bodies are located are important factors for controlling these impacts. Studies like this provide subsidies for decision making in the management and recovery of water bodies and become even more relevant when we evaluate the predictions of increased occurrence of ECEs due to climate change.Acesso AbertoMudanças climáticasSecasTempestadesEutrofizaçãoCienciometriamasterThesisCNPQ::ENGENHARIAS::ENGENHARIA SANITARIA