Banca de DEFESA: JOAO PAULO DA HORA NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO PAULO DA HORA NASCIMENTO
DATE: 22/02/2021
TIME: 14:00
LOCAL: Videoconferência
TITLE:

APPLICATION OF MORPHOMETRIC INDICES FOR IDENTIFICATION OF STRUCTURAL CONTROLS ACTING IN HYDROGRAPHIC BASINS DOWNTOWN SAN FRANCISCO

KEY WORDS:

Structural geomorphology, longitudinal profile analyses, knickpoints, Eastern Northeast Brazil.

PAGES: 89
BIG AREA: Ciências Humanas
AREA: Geografia
SUMMARY:

The variety of topographic forms is guaranteed by the distribution of rock masses of different strengths, composition and position in the earth's crust associated with the most diverse types of existing climates, varying spatially and temporally. Understanding these morphological varieties from their diverse interactions has been at the center of geomorphological discussions since their first applications. This work aims at the morphometric analysis on geomorphological bases of four basins located between Alagoas and Pernambuco (Traipu, Ipanema, Capiá and Moxotó Basins). For this purpose, a series of parameters and indices of a quantitative nature were applied either to the basins, or to the main rivers. Initially, Digital Elevation Models were made with 90m spatial resolution of the Shuttle Radar Topographic Mission data (SRTM) project, from these data the drainage networks were extracted and the basins were delimited, in order to allow the morphometric analysis. First the drainage network was classified according to Strahler (1952), a procedure that served as a criterion for other indexes aimed at the analysis of the drainage network of the basins as a bifurcation relationship, the relationship between the average length of the channels in order and vector equivalent ratio. The analysis of the longitudinal profiles took place from the SL/ k and Ksn indices, which are sensitive to topographic variations related to geological controls; the analysis of the basins took place with the elaboration of hypsometric curves and application of the drainage basin asymmetry factor. Finally, relief lineaments were extracted for each basin for four lighting angles (45º, 90º, 315º and 360º) in order to characterize the direction of the main structures acting in the relief organization of the studied area. The application of gradient indices allowed the identification of the main rupture sectors in the longitudinal profiles of the main rivers in the four basins. These break sectors may have different genesis, however, the relative regularity in the distribution of sectors in the lower courses of the main channels, may indicate the performance of a common genesis associated with litho-structural conditions.

BANKING MEMBERS:
Externo à Instituição - ANTONIO CARLOS DE BARROS CORRÊA - UFPE
Presidente - 1891214 - KLEYTHON DE ARAUJO MONTEIRO
Interna - 1574934 - NIVANEIDE ALVES DE MELO FALCAO