DSpace Communidade:

Padrões de distribuição do lixo marinho na praia do Caça e Pesca Fortaleza (CE)

2026-06-16T15:16:49Z

Título: Padrões de distribuição do lixo marinho na praia do Caça e Pesca Fortaleza (CE) Autor(es): Almeida, Lucas Emanoel Cunha Vidal de Abstract: Solid waste has become increasingly present in natural environments, with beaches being one of the most impacted sites. The transport and deposition of these materials are influenced by natural processes such as winds, waves, and tides, as well as by nearby watercourses, such as rivers and estuaries, which act as important vectors for the input of waste to the coastline. Northeastern Brazil is strongly influenced by the Intertropical Convergence Zone (ITCZ), characterizing two distinct periods throughout the year: rainy and dry, according to the displacement of the trade winds. The present study aimed to analyze the distribution of solid waste on Caça e Pesca Beach, in Fortaleza, Ceará, evaluating the influence of seasonality on the quantity and dispersion of these materials. The results demonstrated that the proximity to a water body and seasonality play fundamental roles in the distribution of solid waste, influencing both the quantity and the spatial distribution along the beach. The study made it possible to understand the mechanisms of transport and accumulation of waste in the two analyzed periods, providing a detailed overview of environmental dynamics and the areas most susceptible to the deposition of marine litter in the region. The study showed plastic as the solid waste that most frequently appears in all beach transects, and its distribution is seasonally influenced, with large quantities during the rainy period and fewer occurrences during the dry period. The mouth of the Cocó River also exerts influence on the redistribution of marine litter along the beach. This work is included within the Sustainable Development Goals of the 2030 Agenda, in line with SDG 14 – Life Below Water, which aims at the conservation and sustainable use of oceans, seas, and marine resources for sustainable development. Tipo: TCC

Biomonitoramento da contaminação por metais em estuários cearenses utilizando moluscos bivalves: uma análise integrada de sedimentos e organismos

2026-06-16T15:12:58Z

Título: Biomonitoramento da contaminação por metais em estuários cearenses utilizando moluscos bivalves: uma análise integrada de sedimentos e organismos Autor(es): Bruno, Liana Raquel Rodrigues Soares Abstract: This study evaluated the contamination by trace metals (Cd, Cu, Pb, and Zn) and their bioavailability in three estuaries in Ceará (Brazil) with distinct levels of anthropogenic impact: Pacoti (slightly eutrophic), Jaguaribe (eutrophic), and Cocó (eutrophic and urban). The approach integrated the analysis of metals in the soft tissues of six bivalve species (Anomalocardia flexuosa, Austromacoma constricta, Iphigenia brasiliensis, Tagelus plebeius, Phacoides pectinatus, and Myella strigata) with the mobility of metals (labile and refractory fractions) in the fine fraction (<125 μm) of the sediment. Concentrations in organisms and sediment were determined by atomic absorption spectrometry after acid digestion. The results indicated that bioaccumulation in bivalves is more closely related to the concentration of metals in the labile fraction of the sediment than to the total concentration. The species exhibited distinct responses to contamination, influenced by their physiology and detoxification strategies. Anomalocardia flexuosa confirmed its potential as a widely distributed biomonitor, while Phacoides pectinatus demonstrated high sensitivity and bioaccumulation of Pb, standing out as a promising candidate for more specific monitoring. Concentrations of Cu and Pb in some organisms were recorded above the limits established for consumption by Brazilian legislation, indicating a potential risk to public health. This study provides pioneering data for the Cocó estuary and reinforces the importance of analyzing metal mobility in sediments for a realistic assessment of risk and the effectiveness of biomonitoring in tropical estuarine environments. Tipo: TCC

Influência dos Oceanos Pacífico E Atlântico na pré-estação chuvosa no estado do Ceará

2026-06-16T15:05:18Z

Título: Influência dos Oceanos Pacífico E Atlântico na pré-estação chuvosa no estado do Ceará Autor(es): Soares, Ana Laissa Costa Abstract: The pre-rainy season (PRS) in Ceará, which includes December and January, represents an intraseasonal period of high climatic and socioeconomic relevance, as it marks the transition between the dry season and the rainy season. Despite its importance, this interval still shows high temporal variability and low predictability, especially when compared to the classical months of the rainy season (RS). Therefore, this study aimed to investigate the influence of the Pacific and Atlantic Oceans on the occurrence and persistence of rainfall during the PRS. This research was mainly motivated by the recurrence of significant rainfall episodes in December and January that do not clearly fit the oceanic signals traditionally used in climate prediction, raising questions about the dominant mechanisms in this transition period. For this purpose, time series and spatial fields of precipitation and sea surface temperature (SST) were analyzed, as well as atmospheric variables in low and mid-levels, allowing an integrated assessment of ocean, atmosphere, and rainfall. The results indicate that, during the PRS, the statistical relationship between precipitation in Ceará and SST variability in the Niño 3.4 region is weak and spatially inconsistent, especially for January precipitation. This behavior suggests that, unlike what is observed during the RS, the influence of the El Niño–Southern Oscillation (ENSO) does not manifest in a direct or dominant way in this transition period. A similar behavior occurs for the tropical South Atlantic area in relation to December precipitation. In contrast, the atmospheric analyses show that the occurrence of more persistent rainfall is mainly linked to the presence of ascending motions at mid-levels and to low-level convergence over northeastern, favoring convective organization and the maintenance of precipitating systems. Additionally, the relative importance of the South Atlantic stands out in the context of its relationship with the PRS and atmospheric indicators. SST anomalies in this region showed a higher, yet still low, correlation with rainfall distribution and persistence, especially in January, which precedes the establishment of the RS. This Atlantic region is recognized as an area of origin and intensification of the South Atlantic Convergence Zone (SACZ), whose concave configuration allows the formation of a circulation flow that may extend toward the northern Northeast Brazil (nNEB), which can be clearly observed in the mid-level anomaly maps for each selected rainy year. This arrangement favors moisture channeling and contributes to the establishment of convection over Ceará, supporting positive rainfall anomalies even when the surrounding thermal environment is not favorable to sustain this scenario. Thus, the results reinforce that this climatic transition period has a strong connection with atmospheric systems that occur through interactions with the South Atlantic and over the Brazilian territory, while the influence of SST in both oceans appears limited. This finding emphasizes the need for integrated approaches to understand and predict rainfall during the PRS, expanding the understanding of the dynamics that precede the RS in the nNEB. Tipo: TCC

Influência da morfologia praial na capacidade de carga física da Praia da Taibinha, Ceará

2026-03-26T13:41:08Z

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