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Universidade Federal do Rio Grande do Norte (UFRN) 2020

A seca e seus impactos quali-quantitativos na disponibilidade hídrica de reservatórios na Região Semiárida

Santos, Diógenes Fernandes dos

Titre : A seca e seus impactos quali-quantitativos na disponibilidade hídrica de reservatórios na Região Semiárida

Auteur : Santos, Diógenes Fernandes dos

Université de soutenance : Universidade Federal do Rio Grande do Norte (UFRN)

Grade : Mestrado em Engenharia Sanitária e Ambiental 2020

Résumé partiel
Drought is a natural and recurring phenomenon, especially in the Brazilian semiarid region, which is vulnerable to interannual climate variability. In this sense, aquatic ecosystems, especially continental ones, as reservoirs, are increasingly susceptible to the actions of extreme events (severe drought, intense rains). Thus, the characteristics of semi-arid regions, such as the intermittency of rivers and high rates of evaporation, combined with prolonged drought, tend to increase the levels of nutrients and the residence time of reservoir water, favoring the eutrophic condition and the unfeasibility the use of these for human activities. The aim of this study was to identify the occurrence and characteristics of drought, and how it is associated with the temporal variability of the water volume stored in the springs of the semiarid region. In addition, the study sought to assess the impacts of prolonged drought on the water quality of these sources, verifying whether there was a change in their trophic state during the occurrence of drought events. To this end, the study was carried out in two small reservoirs ( 12.7 and 10.4 km²) in the Piancó-Piranhas-Açu River basin, in the semi-arid region of the state of Rio Grande do Norte. To identify the periods and characteristics of the meteorological and hydrological droughts, the SPI (Standardized Precipitation Index) was used, calculated from a 57-year-old rainfall database (1963-2019) (EMPARN), and the anomaly of the stored water volume in reservoirs for 19 years (2001-2019) (IGARN).

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Page publiée le 25 novembre 2020