Banca de DEFESA: DANIELA MARIA FERNANDES TAVARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIELA MARIA FERNANDES TAVARES
DATE: 15/02/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Engenharia Civil
TITLE:

Performance Analysis of a Hydrological Model to Land Use Input Data Obtained through Vegetation Index for the Pajeú River Hydrographic Basin

KEY WORDS:

land use; remote sensing; hydrological modelling; SWAT; water management.

PAGES: 91
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The understanding and creation of land use data are fundamental for the integrated analysis and proposition of improvements of water management tools in a hydrographic basin. Distinguishing different land use patterns and how sensitive this factor is in hydrological models is extremely important to understand water dynamics, guarantee security and access to water. Thus, this work aimed to analyze land use products in the performance of simulations of surface flows in the area of the watershed of the Pajeú river, in the State of Pernambuco. To obtain land use maps for the years 2002 and 2015, a remote sensing technique was used, the Normalized Difference Vegetation Index (NDVI). For hydrological modeling of the basin, the Soil and Water Assessment Tool (SWAT) model was used for two stages: (i) simulation without parameter adjustment and (ii) simulation with adjusted parameters. For the first stage, two simulations were carried out, one for each land use map, and then it was analyzed which map had the best performance in simulating flow when compared to the observed data set (in situ). In the second stage, the parameter adjustment procedure was carried out in the SWAT-CUP, where the land use map that previously obtained the best performance was used, and finally the flow values were compared to the observed data set and the flow values obtained by the simulation of the SUPer. The results indicated that in relation to changes in land use, there was an increase in the area of exposed soil classes (2.83%) and undergrowth (12.96%) and a decrease in areas of shrubby vegetation (12.43%) and arboreal (3.12%) when comparing the 2002 and 2015 maps. The analysis of the model performance without parameter adjustment showed that the simulation with the input of land use from 2002 provided positive results for the five fluviometric stations (NS, PBIAS and R2). As for the 2015 land use map, the performance was not satisfactory, obtaining negative values for the fluviometric stations. The comparison between the SUPer simulation, the simulation for the 2002 land use map and the observed data (in situ) showed that for the five fluviometric stations the values obtained followed the same graphic behavior, however with statistical parameters varying downwards. The parameter adjustments step demonstrated that the model without calibration obtained positive responses for flow even with the variation of the land use input data. In general, the changes resulting from land use in the Pajeú river basin indicated an increase in areas with less dense vegetation, which may be an indication of biome degradation in the Pajeú river basin. In this context, it can be said that the use of vegetation indices as input for land use in the SWAT model showed a favorable behavior when compared to the observed data.

COMMITTEE MEMBERS:
Presidente - 1688881 - ALFREDO RIBEIRO NETO
Externa ao Programa - 1510820 - JOSICLEDA DOMICIANO GALVINCIO - nullExterno à Instituição - RICHARDE MARQUES DA SILVA - UFPB