Banca de DEFESA: Priscilla Regina da Silva

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Priscilla Regina da Silva
DATE: 25/10/2022
TIME: 14:30
LOCAL: Sala de Informática do PTARH com Transmissão pela Plataforma MS Teams
TITLE:

PROSPECTIVE ANALYSIS OF DIFFERENT LAND USE SCENARIOS AND WATER AND SOIL MANAGEMENT CONSERVATION PRACTICES IN AGRICULTURAL WATERSHEDS

KEY WORDS:

Land-use Scenarios, Agricultural Water and Soil Management, Hydrological Modeling, SWAT+.

PAGES: 188
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

The development of agricultural activities is directly linked to natural resource availability and is continually affected by climate instability and water scarcity events. The improper use of rural areas, the suppression of native vegetation, and the inadequate and outdated management practices influence the watershed hydrological behavior. Soil and water management and conservation practices are considered potential technical alternatives to help the continuation, improvement, and evolution of sustainable agricultural activity. The objective of this study was to analyze how land use change and the application of techniques and practices of management and conservation of water and soil influence the water balance and the quality of water resources, considering two predominantly rural watersheds and contributors to the main water public reservoir in the Federal District (Descoberto Reservoir): Capão Comprido stream and the Rodeador stream watersheds. Therefore, the study relied on the characterization of four land-use scenarios in the region, that address the beginning of the agricultural occupation, with the construction of Brasília (Brazil's capital), until the most current occupation model. The SWAT+ database was parameterized and adapted to the rural context of the region, with the addition of information related to fertilizers, agricultural implements, soil conservation practices, and irrigation management adjusted to the local reality. Modeling was performed for the four land-use scenarios, relying on sensitivity analysis of 10 parameters and automatic calibration based on observed daily flow data. Calibration was chosen for the Capão Comprido watershed, which was replicated in the Rodeador watershed after. The Nash-Sutcliffe efficiency coefficients (NSE), coefficient of determination (R²), and PBIAS were used, but they were not considered satisfactory for all scenarios regarding calibration and verification. The hydrologic modeling of the changes in influences on land use, water, and soil conservation practices, was carried out with the simulation of the most current land use scenario, correlating the adoption of conventional management practices and conservationist practices. It was found that with the use of conservation practices, the Capão Comprido and Rodeador watersheds responded to the decrease of sediments carried, increased percolation and infiltration in the soil, and, consequently, greater regularity in the water regime of the watershed.

BANKING MEMBERS:
Presidente - 2189333 - RICARDO TEZINI MINOTI
Interno - 404772 - SERGIO KOIDE
Externo à Instituição - Silvio Crestana - EMBRAPA