Categorization of the trophic status of a hydroelectric power plant reservoir in the Brazilian Amazon by statistical analyses and fuzzy approaches

Lobato, Tarcísio da Costa; Hauser‐Davis, Rachel Ann; Oliveira, Tatianne Ferreira de; Maciel, Marinalva Cardoso; Tavares, Maria Regina Madruga; Silveira, Antonio Morais da; Saraiva, Augusto Cesar Fonseca

doi:10.1016/j.scitotenv.2014.11.032

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…However, the reservoir water quality is likely changing as the reservoir is receiving loads of pollutants from adjacent anthropogenic activities during its operation [13,14]. Water quality deterioration is a common problem in reservoirs surrounded with anthropogenic activities receiving high loads of suspended solids, organic matter, and nutrients [15,16].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River

Ling

Gerunsin

Soo

et al. 2017

Journal of Chemistry

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This study examined the water quality of the large young tropical Bakun hydroelectric reservoir in Sarawak, Malaysia, and the influence of the outflow on the downstream river during wet and dry seasons. Water quality was determined at five stations in the reservoir at three different depths and one downstream station. The results show that seasons impacted the water quality of the Bakun Reservoir, particularly in the deeper water column. Significantly lower turbidity, SRP, and TP were found during the wet season. At 3-6 m, the oxygen content fell below 5 mg/L and hypoxia was also recorded. Low NO 2 − -N, NO 3 − -N, and SRP and high BOD 5 , OKN, and TP were observed in the reservoir indicating organic pollution. Active logging activities and the dam construction upstream resulted in water quality deterioration. The outflow decreased the temperature, DO, and pH and increased the turbidity and TSS downstream. Elevated organic matter and nutrients downstream are attributable to domestic discharge along the river. This study shows that the downstream river was affected by the discharge through the turbines, the spillway operations, and domestic waste. Therefore, all these factors should be taken into consideration in the downstream river management for the health of the aquatic organisms.

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Section: Introductionmentioning

confidence: 99%

Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River

Ling

Gerunsin

Soo

et al. 2017

Journal of Chemistry

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“…In April, Chl-a concentrations in the water were in the range of eutrophic, while in July the range reached oligotrophic to mesotrophic values. Da Costa Lobato et al [42] showed similar results in the emptying phase of the reservoir (June to August), classifying this reservoir as mesotrophic with few oligotrophic sites. Low trophic levels in this reservoir could be related to its stabilization process, which is a positive factor for the maintenance of the phytoplankton diversity and biomass [2].…”

Section: Discussionmentioning

confidence: 59%

“…It is characterized by short periods of circulation, as well as thermal and chemical stratification. According to [42], it is a mesotrophic water body. The THR also shows characteristics of a reservoir in the process of stabilization with a steady decrease in phytoplankton diversity [37].…”

Section: Introductionmentioning

confidence: 99%

Using Synergy between Water Limnology and Satellite Imagery to Identify Algal Blooms Extent in a Brazilian Amazonian Reservoir

et al. 2017

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Abstract:Monitoring algal blooms from space is a very challenging task, which becomes particularly difficult when dealing with cyanobacteria blooms. Cyanobacteria are strategic organisms adapted to a wide variety of environmental conditions. In high concentrations, they form scum on the water surface, which is a concern for public health due to the production of toxins, as well as being a nuisance. Knowledge of the ecological role of these organisms is, therefore, essential when trying to estimate their extent from satellite-based data. We present a multidisciplinary approach, based on both the ecological and the optical perspective. This approach is applied in a Brazilian Amazonian reservoir using spatial and temporal scales. The ACOLITE processor is employed to perform atmospheric correction. Extent of the algal bloom is mapped with outputs such as Rayleigh reflectance atmospheric corrected images. Chlorophyll-a estimation is accomplished using a blue-green edge algorithm from the Ocean Biology Processing Group (OBPG), and shows reasonable results (R 2 = 0.95; RMSE = 0.40). The SA red-NIR slope algorithm identifies the extent of the algal bloom at both the spatial and temporal scale. Unfortunately, the performance of these algorithms is most likely affected by weather conditions and glint effects. Therefore, this study recommends that cyanobacteria or phytoplankton studies in this area ensure that their ecological functioning is carefully considered when attempting to map occurrence using limited satellite imagery.

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“…The THR can be classified as a monomictic (Tundisi et al, 2005) and mesotrophic (Lobato et al, 2014) water body, presenting frequent algae blooms during the wet season (Tavares, 2011). The climate in the THR region can be classified as tropical with monsoons (Am) (Peel et al, 2007) with average monthly air temperature ranging from 24.5°C (February) to 28°C (October) and an annual average of 26.5°C.…”

Section: Site Descriptionmentioning

confidence: 99%

Carbon dioxide emissions from Tucuruí reservoir (Amazon biome): New findings based on three-dimensional ecological model simulations

Curtarelli

Ogashawara

Araújo

et al. 2016

Science of The Total Environment

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We used a three-dimensional model to assess the dynamics of diffusive carbon dioxide flux (F(CO2)) from a hydroelectric reservoir located at Amazon rainforest. Our results showed that for the studied periods (2013 summer/wet and winter/dry seasons) the surface averaged F(CO2) presented similar behaviors, with regular emissions peaks. The mean daily surface averaged F(CO2) showed no significant difference between the seasons (p>0.01), with values around -1338mg Cm-2day-1 (summer/wet) and -1395mg Cm-2day-1 (winter/dry). At diel scale, the F(CO2) was large during the night and morning and low during the afternoon in both seasons. Regarding its spatial distribution, the F(CO2) showed to be more heterogeneous during the summer/wet than during the winter/dry season. The highest F(CO2) were observed at transition zone (-300mg Cm-2h-1) during summer and at littoral zone (-55mg Cm-2h-1) during the winter. The total CO2 emitted by the reservoir along 2013 year was estimated to be 1.1Tg C year-1. By extrapolating our results we found that the total carbon emitted by all Amazonian reservoirs can be around 7Tg C year-1, which is 22% lower than the previous published estimate. This significant difference should not be neglected in the carbon inventories since the carbon emission is a key factor when comparing the environmental impacts of different sources of electricity generation and can influences decision makers in the selection of the more appropriate source of electricity and, in case of hydroelectricity, the geographical position of the reservoirs.

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Categorization of the trophic status of a hydroelectric power plant reservoir in the Brazilian Amazon by statistical analyses and fuzzy approaches

Cited by 17 publications

References 22 publications

Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River

Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River

Using Synergy between Water Limnology and Satellite Imagery to Identify Algal Blooms Extent in a Brazilian Amazonian Reservoir

Carbon dioxide emissions from Tucuruí reservoir (Amazon biome): New findings based on three-dimensional ecological model simulations

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