Banca de DEFESA: THIAGO DOUGLAS SILVA DE MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THIAGO DOUGLAS SILVA DE MEDEIROS
DATE: 01/03/2021
TIME: 09:00
LOCAL: Online (Plataforma Google Meet)
TITLE:

Geomorphological dynamics and erosive susceptibility in the Barra Nova River Basin, Seridó Region, Northeast Brazil

KEY WORDS:

Erosion; Susceptibility; Relief; Land use; Loss of soil.

PAGES: 98
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SPECIALTY: Geomorfologia
SUMMARY:

Soil erosion, due to water action, is today an environmental problem affecting different regions across the globe. The disordered use of land in hydrographic basins can potentiate it, triggering several problems; for example: landslides, landslides, silting of reservoirs, among others. Thus, it is important to carry out analyzes of the implications of changes in land use in the production of sediments and soil losses in river basins. This research aims to analyze the relationship between land use and geomorphological dynamics, in the Barra Nova river basin through three mechanisms: mapping land use in the Barra Nova river basin, in order to understand the activities that are developed in this area area and its influence on geomorphological dynamics; analyze the geomorphological dynamics of the region from the identification of the different relief compartments at their different taxonomic levels; and infer the current stage of soil losses in the Barra Nova River basin, in order to elucidate the level of susceptibility to erosion in the entire basin. For this purpose, images from orbital sensors will be used to map land use and identify geomorphological aspects of the basin, in addition to rainfall, soil and relief data. For estimating soil losses, the Universal Soil Loss Equation (USLE) will be used. So far, land use mapping has been carried out with the identification of 11 classes of use that have been verified in the field, in which the Pasture for Animals class is the one with the highest prevalence, with 53.15% of area, followed by of the classes Degraded Caatinga, Diversified Temporary Cultivation, Shrub Caatinga, Artificial Reservoirs, Cities, Unidentified Use, Caatinga Arboreal, Villages, Extraction of Non-Metallic Minerals and Other Urbanized Areas. The Other Urbanized Areas class, in turn, has the lowest occupation area, with only 0.001%. The identification of morpho-sculptural subunits up to the 4th taxon of the methodology proposed by Ross (1992) has also begun, as well as the collection of data for the estimation of soil losses from the USLE.

BANKING MEMBERS:
Presidente - 2289755 - SAULO ROBERTO DE OLIVEIRA VITAL
Interno - 2506087 - MARCO TULIO MENDONCA DINIZ
Externo à Instituição - ANTÓNIO BENTO GONÇALVES - UMinho
Externo à Instituição - ANTONIO JOSE TEIXEIRA GUERRA - UFRJ