Banca de DEFESA: MONICA KASSIANE DE ALMADA OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MONICA KASSIANE DE ALMADA OLIVEIRA
DATE: 30/08/2023
TIME: 14:00
LOCAL: Por video conferência
TITLE:

THE EFFECT OF SOIL CONSERVATION PRACTICES IN A RIVER BASIN IN THE PROCESS OF DESERTIFICATION: A MODELING STUDY

KEY WORDS:

Soil conservation practices; SWAT; water resources.

PAGES: 100
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Recursos Hídricos
SPECIALTY: Sedimentologia
SUMMARY:

Water erosion is a natural phenomenon that can separate the soil into smaller particles, being transported by surface runoff to deposition in more flattened areas. Soil use and management based on conservation practices reduce the effects of water erosion and can be evaluated using hydrosedimentological modeling. Studies in this area are essential to analyze impacts of change and land use and/or desertification, which expands significantly in the Brazilian semi-arid region. In this sense, the objective of this work was to evaluate the effects of two widely used conservationist practices, terracing and dams, in the containment of erosion and sediment production in the hydrographic basin of the Seridó river. The tool used in this analysis was hydrosedimentological modeling, where three numerical experiments were carried out: (1) control (CNTRL), where natural soil cover and long-term desertification were represented; and scenarios of soil conservation practices: (2) terracing (TERR) and (3) dams (BARR). In general, dams (BARR) showed greater efficiency in reducing erosion and sediment production compared to the efficiency of terraces (TERR), 47% more effective, where sediment production, respectively, was equal to 0, 8 ton/ha/year and 1.2 ton/ha/year, compared to the control scenario (CONTRL), where it was 3.2 ton/ha/year. Terracing and dams considerably reduced soil loss in a watershed undergoing desertification. These practices should also be evaluated in the field, experimentally, in order to assess their applicability in the process of mitigating soil loss due to desertification, as well as calibrating and validating hydrosedimentological models. Advances in this area can help guarantee food security and water quality in the Brazilian semi-arid region.

COMMITTEE MEMBERS:
Presidente - 2411669 - JONATHAN MOTA DA SILVA
Interna - 1759777 - ADELENA GONCALVES MAIA
Externo à Instituição - DAVI RODRIGUES RABELO - UECE
Externa à Instituição - SANDRA ISAY SAAD - UFCG