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Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X1717
Acta Limnologica Brasiliensia
Original Article

Application of multivariate methods and geoestatistics to model the relationship between CO2 emissions and physicochemical variables in the Hidrosogamoso reservoir, Colombia

Aplicação de métodos multivariados e geoestatísticos para modelar a relação entre as emissões de CO2 e as variáveis fisicoquímicas no reservatório de Hidrosogamoso, Colômbia

Ingry Natalia Gómez Miranda; Fabio Vélez Macías; Gustavo Antonio Peñuela Mesa

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Abstract

Abstract: : Aim: This article deals with the estimation of a model for CO2 emissions in the Hidrosogamoso reservoir based on the organic matter level and water quality. This is in order to determine the impact of the creation of a tropical reservoir on the generation of greenhouse gases (GHG), and to establish the water quality and emissions dynamics. We hypothesize that the spatial variability of emissions is determined by water quality and carbon cycling in water.

Methods: Multivariate techniques were applied to determine the relationships between CO2 and certain physicochemical variables measured in the reservoir between February and May 2015, taking samples in 10 stations and measuring 14 variables (water quality parameters and CO2). Factor, cluster, discriminant and regression analysis, as well as the geostatistical technique kriging, were used.

Results: We observed that all variables except dissolved organic carbon have strong linear relationships. Nitrate, total-P, total solids and total suspended solids are related due to the presence of nutrients in the water; chlorophyll a and biodegradable dissolved organic carbon due to organic carbon; and alkalinity and dissolved solids due to dissolved minerals. The sampling stations can be classified into two homogeneous groups. The first consists of the stations peripheral to the reservoir and the second of stations inside the reservoir. This difference is due mainly to the behavior of chlorophyll a and biodegradable dissolved organic carbon, and these two variables are also the best predictors for CO2, with a maximum adjustment of 70%.

Conclusions: Our main conclusion is that the production of CO2 is due to decomposition of flooded organic carbon, depends on the soils flooded and the tributary water quality, and that the production of this gas will, based on the literature, continue for 5 to 10 years depending on the nature of the forest flooded.

Keywords

CO2 emissions, hydropower, organic carbon, tropical reservoir, water quality

Resumo

Resumo: : Objetivo: Este artigo trata de estimar um modelo de emissões de CO2 no reservatório Hidrosogamoso a partir da matéria orgânica e da qualidade da água, para determinar o impacto da criação de um reservatório tropical na geração de gases de efeito estufa (GEE) e estabelecer a dinâmica da qualidade da água e das emissões. Nossa hipótese é que a variabilidade espacial das emissões é forçada pela qualidade da água e pelo ciclo do carbono na água.

Métodos: Técnicas multivariadas foram aplicadas para determinar as relações entre o CO2 e determinadas variáveis físico-químicas medidas no reservatório entre fevereiro e maio de 2015, tomando amostras em 10 estações e medindo 14 variáveis (parâmetros de qualidade da água e CO2). Foram usadas as técnicas estatísticas de Fator, Cluster, Análise Discriminante e Regressiva, bem como a técnica geoestatística de krigagem.

Resultados: Observamos que todas as variáveis, exceto o carbono orgânico dissolvido, possuem fortes relações lineares. Nitrato, P-total, sólidos totais e sólidos suspensos totais estão relacionados devido à presença de nutrientes na água; clorofila a e carbono orgânico dissolvido biodegradável devido ao carbono orgânico; e alcalinidade e sólidos dissolvidos devido a minerais dissolvidos. As estações de amostragem podem ser classificadas em dois grupos homogêneos. O primeiro consiste nas estações periféricas do reservatório e a segunda das estações no interior do reservatório. Essa diferença é devido principalmente ao comportamento da clorofila e do carbono orgânico dissolvido biodegradável, e essas duas variáveis também são os melhores preditores para o CO2, com um ajuste máximo de 70%.

Conclusões: Nossa principal conclusão é que a produção de CO2 é devido à decomposição do carbono orgânico inundado, aos solos inundados e à qualidade da água dos afluentes, e que a produção deste gás continuará, de acordo com a literatura, por 5 ou 10 anos, dependendo da natureza da floresta inundada.
 

Palavras-chave

emissões de CO2, hidrelétrica, carbono orgânico, reservatório tropical, qualidade da água

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Submitted date:
02/10/2017

Accepted date:
11/14/2019

Publication date:
08/03/2020

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