Banca de DEFESA: THIAGO CAVALCANTE LINS SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THIAGO CAVALCANTE LINS SILVA
DATE: 14/05/2021
TIME: 09:00
LOCAL: Videoconferência
TITLE:

MORPHODYNAMIC CONDITION AND GEOMORPHOLOGY OF THE SÃO FRANCISCO DUNE FIELD IN THE STATE OF ALAGOAS

KEY WORDS:

Coastal Geomorphology; Wind Forms; Time Variations.

PAGES: 156
BIG AREA: Ciências Humanas
AREA: Geografia
SUMMARY:

Wind farms are very sensitive to climatic variations, resulting in occasional remodeling processes, controlled by balancing and interrelationships that result in a multiplicity of wind forms. The Piaçabuçu Dunes, inserted in the Lower São Francisco, constitutes a very dynamic area in the Coast of Alagoas, for this reason it presents a diversity of studies related to it, however, the studies of geological-geomorphological nature are dated from the last decade, needing updates and adjustments. Hence the need for systematic studies that seek to re-discuss and detail the geomorphological dynamics. In this context, the present work constituted a proposal for an integrated analysis of geomorphological dynamics using techniques for analyzing the wind regime, morphoplanimetric analysis techniques, mapping of relief units, temporal analysis of variations in the dune field, in addition to spatial modeling techniques 1D. The results showed that the regional wind regime promotes the wind drift of the dunes in the Southwest direction, with greater drift processes between the months of November to January; where these temporally have correlations with the events of El Niño. The drift processes, in turn, condition the rework of the lower dune ridges, with high defect density and little elongation, while the higher portions present a more stable and evolutionarily more resistant context. In relation to the mapped models, a variety of wind morphologies were found, grouped in the associations of the beach-dune system, of the deflationary associations and free associations, with simple and complex morphologies, with a potential increase in the complexity of shapes vertically and horizontally in the the mouth. Regarding the temporal space analysis, retreat behaviors were identified in the vicinity of the river mouth with retreat rates of 20 m / a and erosion rate of 170,000 m² / a, while the advance movements of the dune field were found rates of 10 m / a and feed rate 58,000 m² / y. Future scenarios were projected with the rates of advance and retreat found in the different features, promoting the identification of significant additions of advance and retreat for the years 2056 and 2070, covering vegetated areas and river courses. In the correlation of the results, the bus process was identified in the control of the stability of the wind system, interpreting the topographic and vegetal barriers as essential, allowing the resilience and control of the advance of the dunes. In a conclusive way this study carried out a detailed diagnosis of the dune field, identifying its modeling factors, its modeling, its forms, its modifications and its uses, allowing a series of correlations in the construction of interpretations not previously carried out using a methodology of low cost and quite feasible for applications in other regions.

BANKING MEMBERS:
Interna - 1717255 - ANA PAULA LOPES DA SILVA
Externo ao Programa - 1881518 - BRUNO FERREIRA
Externo à Instituição - MARCO TULIO MENDONÇA DINIZ - UFRN
Presidente - 1574934 - NIVANEIDE ALVES DE MELO FALCAO