DANTAS, A. K. E. A.; http://lattes.cnpq.br/7708692904586731; DANTAS, Ana Karoline Eloi de Araújo.
Resumo:
Because it is a very laborious approach, manual calibration of a hydrological model applied to
a watershed in a semiarid region requires the modeler to have prior knowledge of the watershed
and, if possible, sufficient data to obtain reliable results. Knowing the potential of the SWAT
model (Soil and Water Assessment Tool) as a tool for hydrological modeling and considering
the lack of studies using this model to predict the volume of reservoirs in watersheds in Brazil,
we sought to apply this work. a methodology to perform the sensitivity analysis and manual
calibration of SWAT model parameters, aiming to evaluate its effectiveness in the
representation of Sumé reservoir volume, analyzing the hydrological processes that take place
in the watershed upstream of the reservoir dam. The above-mentioned basin is 770 km2 and is
located in the semiarid region of northeastern Brazil. Sensitivity analysis was performed
manually on 12 different parameters of the model, using the methodology proposed by Haan
(2002), and revealed that only five of them were the most influential in volume prediction,
namely: CN2, CANMX, GWQMN, SOL_AWC and ESCO. Manual calibration of the model
was performed for the period 1994 and 2008, comparing the modeled volume with the observed
one, and taking the Nash-Sutcliffe coefficient (NSE) and the determination coefficient (R2) as
indicators of fit quality. At the end, the values of NSE and R2 were greater than 0.5,
demonstrating the model's median performance in simulating the volume of the dam under the
conditions of the study watershed.