Banca de DEFESA: ROBERTO SÁVIO RODRIGUES BRASIL

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ROBERTO SÁVIO RODRIGUES BRASIL
DATE: 01/06/2025
TIME: 09:00
LOCAL: Google meet
TITLE:

RIVER GEOMORPHOLOGICAL DYNAMICS OF THE MADEIRA RIVER IN THE SECTION OF THE MUNICIPALITY OF MANICORE/AM AND ITS IMPLICATIONS ON URBAN RIVERSIDE AREAS

KEY WORDS:

River dynamics, climate change, Madeira River, remote sensing, riverside communities

PAGES: 149
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SPECIALTY: Hidrogeografia
SUMMARY:

This study investigates the changes in the geomorphological dynamics of the Madeira River in the stretch that runs through the municipality of Manicore-AM, between 1985 and 2023, and their impacts on the river environment and riverside communities. The main hypothesis suggests that climate change, by altering the rainfall regime, influenced the volume and intensity of the river's floods and ebbs. The general objective is to analyze these geomorphological changes and their consequences for riverside urban areas. The research was divided into three objectives: (1) to identify and map the geomorphological modifications of the Madeira River; (2) to analyze the region's flow and precipitation cycles; and (3) to identify and characterize the impacted riverside urban areas. Using ArcGIS, the physical aspects of the area, such as geology, geomorphology, and soils, were mapped. Remote sensing with images from the Landsat 5 (TM) and Landsat 8 (OLI) satellites was used to document changes in the riverbed and banks between 1986 and 2023. The images were acquired by the EarthExplorer platform (USGS) and by INPE, and processed with software such as ArcGIS, QGIS and ENVI. For the second objective, flow and precipitation data were obtained from ANA, referring to stations 15700000 and 561001 in Manicore, and 1065002 in Guajara-Mirim. This information allowed the identification of seasonal fluctuations and their impacts on the dynamics of the river waters, revealing an increase in extreme variations in flow, with more intense floods and more severe periods of drought, especially since the last two decades. For the third objective, mapping of riverside communities was carried out with QGIS and complemented by fieldwork, recording photographs and geographic coordinates. The social characterization included informal conversations with residents to understand their family structure, sources of income (mainly fishing and agriculture), access to services such as health and education, and the difficulties faced due to changes in the river regime. The results show that the geomorphological changes were caused by both natural and human factors. The interaction between climate, geology, geomorphology, and soils increased the vulnerability of the area to erosion, riverbank collapse, and sediment displacement. In addition, riverside communities were severely impacted. More frequent and intense floods and droughts led to the loss of homes, agricultural land, and economic hardship, forcing many to migrate or adapt their subsistence activities. The geosystemic approach was used, based on authors such as Bertrand (1972), Sotchava (1976), and Tricart (1977). The study highlights the need for effective territorial planning and sustainable management of natural resources to mitigate impacts on local communities and the environment. Adaptive strategies, such as building flood-resilient infrastructure and proper soil management, are essential to ensure the sustainable use of water resources and the safety of riverside communities.

COMMITTEE MEMBERS:
Interno - 396929 - DORISVALDER DIAS NUNES
Interno - 3102827 - JOAO PAULO ASSIS GOBO
Presidente - 2313615 - MICHEL WATANABE
Externa à Instituição - TAMIRES CUNHA DE AGUIAR