https://repositorio.ufba.br/handle/ufba/524 Sun, 17 May 2026 03:42:31 GMT 2026-05-17T03:42:31Z http://repositorio.ufba.br:80/xmlui/bitstream/id/460c48c7-d55c-4daa-bfa6-48d8504a2fd4/logo geociências.PNG https://repositorio.ufba.br/handle/ufba/524 https://repositorio.ufba.br/handle/ri/44105 Inventário e avaliação quali-quantitativa de sítios de geodiversidade na Bacia do Recôncavo no Nordeste do Brasil. Seabra, Gleide Mendes Barbosa, Natanael da Silva The Recôncavo Basin, located in the eastern portion of the state of Bahia, Northeast Region of Brazil, is mostly covered by Mesozoic sediments, derived from taphrogenesis that began slightly before this era, still in the Paleozoic, during the fragmentation process of the supercontinent Gondwana. The chronology of the basin's formation is defined by three stages of rift evolution, with a complete and representative sedimentary sequence of all phases during the Permian (~298 and 252 Ma). The Permian record in northeastern Brazil begins with lithostratigraphic successions, with excellent seasonal coverage and diverse geological content. The scientific importance of the representative outcrops of the Recôncavo Basin is already being explored, through field trips, by some federal educational institutions. The area encompasses not only geological content but also landscapes with river formations, lakes, deltas, estuaries, valleys, floodplains, waterfalls, and all associated landscapes resulting from large-scale geological/fluvial processes. In addition to the significant and relevant geological history, scenic and touristic content of the Recôncavo basin, the production of significant quantities of hydrocarbons has been conditioned in this basin. The spatio-temporal variation of this lithostratigraphic succession presents scientific and educational potential, as well as economic importance, and has potential for the classification and evaluation of geological materials indicative of environmental protection. These factors justify the need for a geoconservation study, the objective of this work, which involves the inventory, quantification, and quantitative evaluation of geosites in the region. Using the methodology of the Geosites and Geodiversity Sites Registration and Quantification System - GEOSSIT (Mineral Resources Research Company - CPRM/Geological Survey of Brazil - SGB), six geosites were selected and analyzed based on their scientific, educational, and touristic values. The results indicate that the sites have high scientific value and potential for geoeducation, although they present a high risk of degradation due to their proximity to highways. This highlights that valuing this geoheritage is essential for geoconservation strategies and for regional sustainable development through geotourism. Universidade Federal da Bahia Dissertação Mon, 10 Nov 2025 00:00:00 GMT https://repositorio.ufba.br/handle/ri/44105 2025-11-10T00:00:00Z https://repositorio.ufba.br/handle/ri/44047 Aspectos naturais e antropogênicos associados ao rebaixamento do aquífero cárstico do platô de Irecê, Bahia. Silva, Hailton Mello da Leal, Luiz Rogério Bastos The Hydrogeological Basin of the Verde and Jacaré Rivers, located in the north-central portion of the State of Bahia, is almost entirely overlain by an area of carbonate sedimentary rocks, which constitutes an important karst aquifer in the semi-arid region of Bahia. The clayey soil, with its reddish-yellow hue and high fertility, along with the relatively flat topography, favors agriculture, which is one of the main economic activities practiced in the region. However, given the intrinsic characteristics of a karst environment in a semi-arid climate, the lack of surface water, caused by the existence of rapid percolation zones and sinkholes that absorb rainfall and quickly incorporate it into underground drainage, as well as high evapotranspiration necessitates the search for groundwater as a means of irrigation for cultivated areas. Nevertheless, in recent decades, human occupation in the region has intensified and with the increase in cultivation, there has been a rise in drilling of tubular wells, requiring a disorderly extraction of groundwater, lowering the aquifer and jeopardizing the water potential of that reservoir. Similarly, deforestation for agricultural occupation has led to the extinction of springs responsible for feeding the rivers of this basin, transforming intermittent rivers into ephemeral ones. Likewise, the uncontrolled use of nutrients and pesticides in agriculture has contaminated the aquifer and rendered its waters unsuitable for human consumption. On the other hand, the lack of control over human occupation without adequate infrastructure for solid waste disposal and without appropriate sewage systems has contributed to this contamination due to the great fragility of the karst environment. Thus, this work aims to show that there is an association between anthropogenic and natural factors that are leading to the degradation of the Irecê karst aquifer. This objective was achieved by cross-referencing the karst characteristics of the aquifer, hydrogeological data from tubular wells, land use and occupation data obtained from satellite images and historical rainfall data in the region. It was then possible to conclude that the entire Irecê karst aquifer is subjected to anthropogenic pressure which together with the natural conditions imposed by a semi-arid climate and low rainfall could lead to stagnation of this aquifer. Similarly, this study determined that the central area of the Irecê Karst Aquifer is experiencing the greatest anthropogenic pressure, compromising both the quality and quantity of its groundwater and requiring greater attention from the management bodies in this region. As a result, suggestions were made for implementing actions that, if conducted correctly could assist in the management of the entire Irecê Karst Aquifer, with greater emphasis on the central area, thus helping to control the degradation of this important aquifer in Bahia. Universidade Federal da Bahia Tese Thu, 01 Dec 0012 00:00:00 GMT https://repositorio.ufba.br/handle/ri/44047 0012-12-01T00:00:00Z https://repositorio.ufba.br/handle/ri/43310 Transformações nos usos das terras em Belmonte e Canavieiras, Bahia-Brasil (1960 – 2005). Cardoso, Dária Maria Cordeiro The study of land use and land-use changes is fundamentally important, as it allows us to understand the dynamics between natural processes and human actions on geographic space. By revealing how territory is appropriated, transformed, and managed over time, this knowledge offers essential support for the formulation of public policies focused on urban zoning, environmental conservation, and the responsible management of natural resources. This book was created with the aim of making the content more accessible to educators, community leaders, public administrators, and other social actors. Readers are invited to observe the transformations that occurred in the geographic space of the cities of Belmonte and Canavieiras, in Bahia, between 1960 and 2005. This work presents itself as a relevant pedagogical and scientific tool for teaching and communicating research results. Universidade Federal da Bahia Livro Wed, 01 Jan 2025 00:00:00 GMT https://repositorio.ufba.br/handle/ri/43310 2025-01-01T00:00:00Z https://repositorio.ufba.br/handle/ri/43283 Caracterização da morfodinâmica das praias da Ilha da Trindade. Nascimento, Thayná Pelição Machado, Arthur Antônio Trindade Island, located in the South Atlantic Ocean, represents a tropical insular environment of high scientific and environmental relevance, yet remains poorly investigated regarding its coastal morphodynamics. This study aimed to characterize the morphodynamic behavior of six sandy beaches — Calheta, Cabritas, Tartarugas, Príncipe, Andrada, and Vermelha — through the analysis of topographic profiles collected during five field campaigns conducted between 2013 and 2024. Data were processed using Matlab®, allowing the calculation of volumetric variation (m³/m), beach mobility parameters (mean width, standard deviation, and coefficient of variation), and the identification of seasonal erosion and progradation patterns. The results revealed contrasting morphodynamic behaviors among the beaches. Critical erosion prevailed at Calheta, Cabritas, and Príncipe, reflecting their greater exposure to storm waves and limited geological protection. Conversely, Andrada and Tartarugas showed a stronger tendency toward progradation, related both to sediment supply and to biogenic disturbances, particularly sediment reworking caused by nesting green turtles. Vermelha Beach exhibited an intermediate response, influenced by reef structures and rip-current dynamics. Temporal variations in beach mobility highlighted the combined influence of cold fronts and southern swells, as well as possible indirect anthropogenic effects. The integrated approach combining long-term field surveys enabled the identification of the most erosion-prone sectors and provided valuable insights into sediment transport processes in Brazilian oceanic islands. These findings underscore the importance of continuous monitoring as a basis for conservation and coastal management strategies in vulnerable insular systems, particularly in the face of climate change and projected sea-level rise. Universidade Federal da Bahia Dissertação Mon, 25 Jul 0007 00:00:00 GMT https://repositorio.ufba.br/handle/ri/43283 0007-07-25T00:00:00Z