Sensoriamento remoto como ferramenta de monitoramento da qualidade da água do Lago Paranoá (DF)

Abstract

RESUMOEste trabalho testou uma metodologia baseada no sensoriamento remoto para estimar o estado trófico de um reservatório urbano (Lago Paranoá) em Brasília (Brasil), com vistas ao monitoramento da qualidade da água. ABSTRACTThis study has tested a remote sensing method for evaluating the trophic level of an urban reservoir (Paranoá Lake) in Brasilia City (Brazil) aiming at water quality monitoring. Four limnological periods of Paranoá Lake were analyzed after the reservoir-undergone eutrophication as a result of excessive domestic sewage discharge. Data on total phosphorus, chlorophyll-a, water transparency and processed Landsat TM 5 images were used to assess reservoir trophic levels. These data were correlated to limnological data, and maps containing parameter values for the reservoir were produced. By using the Carlson's Trophic State Index, new maps were produced by means of assessing the trophic state of Paranoá Lake for each analyzed limnological period. The tested method and proceedings have shown to be appropriate for water quality monitoring, since they reproduced the changes that water reservoir experienced after eutrophication.

A modelling approach to simulate Chlorophyta and Cyanobacteria biomasses based on historical data of a Brazilian urban reservoir

“…During the worst water-quality period, mainly in the 70's, studies focusing on phytoplankton characteristics and distribution in Paranoá Lake highlighted the cyanobacteria dominance (Giani and Pinto-Coelho, 1986;Branco and Senna, 1994;1996). Recently, Paranoá Lake has shown an increase of trophic status (Machado and Baptista, 2016) and water quality degradation, resulting in new cyanobacterial blooms (Batista and Fonseca, 2018). The monthly average chlorophyll-a concentration was 21 µg.…”

Spatio-temporal environmental characterization of the Pontal River Basin in the State of Pernambuco

“…Dessa forma, a técnica de sensoriamento pode ser aplicada para gerenciamento de água não só na BHRP, mais como em quaisquer bacias. Aliado ao conhecimento quantitativo, de forma semelhante, Machado et al (2016) apresentou uma metodologia de gerenciamento da qualidade de águas em bacias.…”

Estimate and evaluation of reservoir metrics in Serra da Mesa dam (GO) using the Google Earth Engine platform

“…Due to Brazilian water features, reservoirs were created in order to supply people and generate energy (Machado and Baptista, 2016). The damming of waterways is used to produce electricity, and is also important for other uses such as recreation, fishing, flood control and water supply for population (Moretto et al, 2012;Paz et al 2000).…”

“…Remote sensing is a cheaper and precise alternative for monitoring reservoirs, considering the increasing number of reservoirs, extensive flooded areas and constant need to obtain information (Abileah et al, 2011;Collischonn and Clarke, 2016;Lopes et al, 2017;Machado and Baptista, 2016;Paz et al, 2000). Remote sensors allow continuous and systematic collection of data for qualitative and quantitative assessments of the reservoirs that includes, among other things, information about the synoptic view of large areas, trophic condition, possibility to evaluate the spatial variation of evaporation, and higher sampling frequency compared to conventional techniques (Curtarelli et al, 2013;Galo et al, 2002;Machado and Baptista, 2016;White, 1978).…”