http://repositorio.ufc.br/handle/riufc/22278 2026-04-05T22:11:24Z http://repositorio.ufc.br/handle/riufc/85455 Título: Influência da morfologia praial na capacidade de carga física da Praia da Taibinha, Ceará Autor(es): Nascimento, Lara Cavalcante do Abstract: This study analyzes the influence of the morphological and morphodynamic characteristics of Taibinha Beach, located on the western coast of the state of Ceará, Brazil, on Physical Carrying Capacity (PCC), considering the spatial and temporal variation of the beach area available for recreational use within a specific monitored sector. The study is grounded on the understanding that sandy beaches are highly dynamic coastal systems, in which the alternation between erosional and depositional processes directly controls beach width, user safety, and the quality of the recreational experience. An integrated methodological approach was adopted, combining topographic surveys using GNSS RTK, aerial photogrammetry with an unmanned aerial vehicle (UAV), data processing and spatial analysis in a Geographic Information System (GIS) environment, shoreline change assessment using the Digital Shoreline Analysis System (DSAS), and continuous monitoring of recreational use through video imagery. Recreational use monitoring was conducted between August 2023 and January 2024. Topographic surveys and shoreline analyses were carried out in August 2023, October 2023, and January 2024, while UAV-based photogrammetric surveys were performed in October 2023, January 2024, and April 2024. The study area was delimited to the wet beach zone, which represents the main sector of concentration of recreational activities and nautical sports, covering approximately 6,894.5 m2. The results indicate a intermediate morphodynamic behavior, with a well-defined seasonal alternation between erosional phases, mainly recorded between August and October 2023, when shoreline retreat rates of up to –5.6 m/year were observed, and depositional phases between January and April 2024, characterized by positive shoreline advance rates of up to +10.1 m/year. The estimated physical carrying capacity for the analyzed sector was approximately 689 simultaneous users, based on a reference value of 10 m2 per user, whereas the maximum observed occupancy during the monitoring period was 301 users, remaining within the categories classified as “comfortable” and “very comfortable.” However, localized erosional processes, particularly those associated with the influence of a stormwater drainage outlet, reduced the continuity and functional availability of the beach area in specific sectors, demonstrating that PCC should be interpreted as a dynamic parameter, conditioned by beach morphology rather than solely by visitor demand. Tipo: TCC 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85454 Título: Dispersão de óleo proveniente das bacias de exploração de petróleo do Ceará e Rio Grande do Norte Autor(es): Aguiar, Kammily Vitória Araújo Abstract: The Brazilian Equatorial Margin has attracted increasing interest for oil exploration, which highlights the need to better understand the potential environmental impacts associated with oil spill events. In this context, this study aimed to analyze the dispersion of oils originating from the Ceará and Rio Grande do Norte oil exploration basins, considering the influence of seasonal and interannual variability of ocean circulation, as well as differences related to the physicochemical properties of oil. Numerical dispersion simulations were performed using a Lagrangian model, considering representative scenarios for January and August of the years 2010 and 2020, selected to represent contrasting hydrodynamic conditions. The adopted methodology allowed the evaluation of spatial and temporal patterns of oil transport, trajectory recurrence, and dispersion extent under different circulation regimes. The results indicated that pollutant dispersion is strongly modulated by ocean circulation, with distinct behaviors between periods characterized by more stable and more energetic hydrodynamic conditions. More intense currents were associated with a wider spatial spreading of oil, reducing local trajectory recurrence, whereas more stable conditions resulted in higher spatial concentration of oil near the continental shelf. The comparison between light and heavy oils revealed contrasting behaviors, with light oil presenting greater dispersion capacity and spatial reach, while heavy oil tended to produce more localized impacts under less energetic conditions. The simulations also indicated the possibility of impacts on oceanic and coastal regions distant from the release points, highlighting the vulnerability of environmentally sensitive areas, such as the Amazon River mouth. It is emphasized, however, that this behavior is directly associated with the time of year, since the seasonal variability of ocean circulation, particularly the strengthening of currents during certain periods, favors the transport of oil over longer distances. These findings demonstrate that numerical modeling is a fundamental tool for assessing environmental impacts associated with oil exploration in the Brazilian Equatorial Margin, supporting environmental management, monitoring strategies, and mitigation planning. Tipo: TCC 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85452 Título: Microplastic pollution in interdune lagoons of two brazilian national parks Autor(es): Lima, Emanuelle Ribeiro Abstract: Microplastics (MP) are particles ranging in size from 1 μm to 5 mm. They are currently considered ubiquitous, as they have been found in a wide variety of environmental compartments. Intermittent interdune lagoons are an intrinsic part of the landscape of northeastern Brazil, constantly attracting visitors who may contribute to MP pollution. Thus, this study seeks to assess and understand the extent of MP pollution in intermittent coastal lagoons in coastal preservation areas that are areas of tourist interest. Therefore, surface water samples were collected in 1L aluminum bottles from 16 visited and unvisited lagoons in the Jericoacoara National Park (JNP) and Lençois Maranhenses National Park (LMNP), which have essential links to tourism. A total of 1,558 MPs were identified, with an average density of 24.34 ± 21.97 MPs L−1. JNP had a higher average density of 31.59 ± 24.46 MPs L−1, while LMNP had an average density of 17.1 ± 16.55 MPs L−1. In terms of shape, fragments and fibers were the most abundant, accounting for 58.2% and 34.5% of the total, respectively. Among colors, blue was the most abundant at 53.9%, followed by red at 21.3%. Finally, there was no significant variation in the size of microplastics, with most being less than 1 mm in size. There was no significant difference between the density and composition of PMs between visited and unvisited lagoons. However, there was a significant difference between parks. This result indicates that visitation is not directly the most important factor for the contamination of these lake environments. Thus, other factors such as winds, geomorphological factors, and proximity to urban centers may have a greater influence on the distribution of PM in lagoons. Further studies are needed to understand the relationships between human activities and environmental factors that contribute to MP pollution in coastal preservation areas. Tipo: TCC 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85451 Título: Origem e distribuição dos beachrocks na costa cearense e a sua influência na dinâmica costeira Autor(es): Sousa, Elizabeth Camilo Aguiar de Abstract: Located in northeastern Brazil, the coast of Ceará is characterized by geological and geomorphological features that directly influence coastal dynamics, among which beachrocks stand out. The main objective of this study was to map and analyze the characteristics of these deposits, based on samples collected from selected beaches along the Ceará coast, investigating their genesis and evaluating their role in shoreline protection and stability, as well as in coastal marine habitats. The influence of coastal dynamics was discussed through multitemporal satellite image analysis, geological–geomorphological mapping, and field observations of the interaction between beachrock outcrops and the prevailing hydrodynamic processes. To achieve these objectives, a bibliographic review focused on beachrocks was conducted, combined with geological and geomorphological mapping, including stratigraphic characterization, spatial distribution, and relationships with other rocks and sedimentary deposits, in addition to sampling and petrographic analyses. The results indicate a wide distribution of beachrocks along the Ceará coast, highlighting their interaction with coastal processes and the influence of marine and fluvio-marine environments on coastal evolution over different periods. These outcrops act as natural barriers, promoting wave energy dissipation, the formation of hydrodynamic shadow zones, and sediment retention, thereby contributing to shoreline protection and stability and to the development of more sheltered marine environments. Petrographic analyses revealed a diversified mineralogical composition, with a predominance of quartz and feldspar in different stages of weathering, indicating sediment supply from both proximal and distal sources subjected to varying degrees of sedimentary reworking. The identification of successive episodes of erosion, deposition, and lithification of new beachrock layers evidences the evolutionary dynamics and resilience of these formations. The occurrence of beachrocks over erosional platforms developed on argillaceous–ferruginous rocks and sediments of the Barreiras Formation indicates the action of variable physicochemical conditions over time, reinforcing the importance of beachrocks as key elements in controlling coastal dynamics along the Ceará coast. Tipo: TCC 2026-01-01T00:00:00Z