Banca de DEFESA: GABRIEL DO NASCIMENTO ALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GABRIEL DO NASCIMENTO ALVES
DATE: 13/07/2022
TIME: 16:00
LOCAL: Webconferência
TITLE:

IDENTIFICATION OF RIVER STYLES OF
THE RIACHO GRANDE HYDROGRAPHIC
BASIN, ALAGOAS

KEY WORDS:

river styles; drylands; fluvial systems.

river styles; drylands; fluvial systems.

 

PAGES: 103
BIG AREA: Ciências Humanas
AREA: Geografia
SUMMARY:

The researches of fluvial systems of drylands is lower in comparison with the studies developed in humid

regions, lacking researches that highlight the particularities of these environments. Thus, the research

brought as issue the investigation of the fluvial dynamics of a hydrographic basin of the semi-arid

environment of Alagoas through associations between the local and regional physical characteristics, their

structural controls, and the interventions resulting from human action. The objective is the characterization

of fluvial typologies that exhibit the above-mentioned set of characteristics in order to know in a more

detailed way the hydrosedimentological dynamics of the main course of the Riacho Grande watershed.

Starting from the hypothesis that the aspects analyzed together can show impacts on the formation and

development of depositional features in the Riacho Grande. With this purpose, it was sought to apply the

first stage of the theoretical-methodological approach of fluvial styles to the main channel of the basin. It

was necessary the application of the Declivity-Extension Ratio (DER) index seeking the plateau ruptures;

the mapping of land use and land cover aiming the anthropic interferences; and the mapping of landscape

units for the investigation of domains of regional topographic controls. It was revealed that plateau ruptures

may be controlling sedimentation processes along the main course along the three landscape units

identified in the basin, being delimited with regions of homogeneous slope and topography. In these units,

land use showed an increase in anthropic intervention coverage over a 20-year period. Finally, four fluvial

typologies were identified: Unconfined, semi-confined with alluvial bed, confined with mixed rock-aluvial

bed, and confined with discontinuous floodplains. Each typology allowed understanding the association of

the data obtained and its expression in sediment deposits along the channel (or its absence). The research

has proven relevant to the development of studies in tropical drylands. Based on the initial phase of the

fluvial styles methodology, the character and behavior of the stretches could be evidenced and correlated in

a way that becomes useful for the management and planning of the study area in relation to water

resources.

BANKING MEMBERS:
Externo à Instituição - JONAS OTAVIANO PRAÇA DE SOUZA - UFPB
Presidente - 1891214 - KLEYTHON DE ARAUJO MONTEIRO
Interno - 2501620 - MELCHIOR CARLOS DO NASCIMENTO