@Article{BreunigPerGalWacCar:2017:CaStSo,
author = "Breunig, F{\'a}bio Marcelo and Pereira Filho, Waterloo and
Galv{\~a}o, L{\^e}nio Soares and Wachholz, Fl{\'a}vio and
Cardoso, Maria Ang{\'e}lica Gon{\c{c}}alves",
affiliation = "{Universidade Federal de Santa Maria (UFSM)} and {Universidade
Federal de Santa Maria (UFSM)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade do Estado do
Amazonas (UEA)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Dynamics of limnological parameters in reservoirs: a case study in
South Brazil using remote sensing and meteorological data",
journal = "Science of the Total Environment",
year = "2017",
volume = "574",
pages = "253--263",
month = "Jan.",
keywords = "MODIS, Total of suspended solids, Chlorophyll, Greenness, Land
use, Rainfall.",
abstract = "Reservoirs are important in Brazil for the production of
hydroelectric power and human water consumption. The objective was
to evaluate the variability of total suspended solids (TSS) and
chlorophyll-a as well as the rainfall/ temperature and land use
impacts on these optically active constituents (OAC). The study
area is the Passo Real reservoir in south Brazil. The methodology
was divided in four steps. First, we used wavelet to detect
anomalous periods of rainfall and temperature (2002-2014). Second,
we carried out 12 field campaigns to obtain in situ measurements
for limnological characterization (2009-2010). The third step was
the analysis of Moderate Resolution Imaging Spectroradiometer
(MODIS)/Terra and Aqua satellites data corrected and non-corrected
for bidirectional effects. Finally, we evaluated potential drivers
of OAC changes over time using cross-correlation analysis. The
results showed a decrease in the TSS and chlorophyll-a
concentrations from the upper to the lower streams of the
reservoir. The exponential regression between the MODIS red
reflectance and TSS had an adjusted r(2) of 0.63. It decreased to
0.53 for the relationship between the green reflectance and
chlorophyll-a. MODIS data corrected for bidirectional effects
provided better OAC estimates than non-corrected data. The
validation of MODIS TSS and chlorophyll-a estimates using a
separate set of measurements showed a RMSE of 2.98 mg/I and 2.33
mu g/l, respectively. MODIS estimates indicated a gradual
transition in OAC from the upper to the lower streams in agreement
with the patterns observed using field limnological data. The
analysis of land use (greenness) showed two well-defined crop
cycles per year. The highest seasonal concentrations of TSS and
chlorophyll-a were observed in December and the lowest
concentrations in April. Despite the interrelationships between
both factors, our cross-correlation analysis indicated that the
great concentrations of TSS and chlorophyll-a were primarily
controlled by rainfall and secondarily by land use.",
doi = "10.1016/j.scitotenv.2016.09.050",
url = "http://dx.doi.org/10.1016/j.scitotenv.2016.09.050",
issn = "0048-9697",
language = "en",
targetfile = "breunig_dynamics.pdf",
urlaccessdate = "25 abr. 2024"
}