PPGG https://repositorio.ufpb.br/jspui/handle/tede/5436 2026-07-05T02:44:16Z 2026-07-05T02:44:16Z Santos, Camilla Jerssica da Silva https://repositorio.ufpb.br/jspui/handle/123456789/38261 2026-07-04T20:47:19Z 2026-02-20T00:00:00Z

Título: Influência da sazonalidade eco-hidrológicas e biogeomorfológica em rios não perenes Autor(es): Santos, Camilla Jerssica da Silva Orientador: Souza, Jonas Otaviano Praça de Abstract: This thesis analyzed the influence of eco-hydrological and biogeomorphological seasonality on the morphology of non-perennial rivers in the Riacho do Tigre basin, located in the semi-arid region of Paraíba, Brazil. The main objective was to examine how eco-hydrological and biogeomorphological seasonal dynamics control the morphology of non-perennial rivers, particularly by understanding how seasonal hydrological variations influence vegetation distribution and resilience, as well as channel morphological evolution.The methodology integrated multiscale analyses: at the drainage network scale, using Sentinel-2 NDVI time series (2016–2023) and rainfall data; at the reach scale, through UAV-based monitoring for the production of orthomosaics, digital terrain models (DTMs), and calculation of the VIgreen index; and at the quadrat scale, using permanent plots to monitor ecological succession across different geomorphic units (channel bed, bars, and margins).The results demonstrated a strong positive correlation between NDVI and accumulated precipitation (60–90 days), highlighting the rapid response of vegetation to rainfall pulses. Monitoring with VIgreen revealed marked seasonal dynamics, with increased vegetation biomass during the rainy season and reduction during dry periods. Quadrat monitoring showed that geomorphic units such as pools and margins sustain higher vegetation diversity and stability, whereas bars and active channels exhibit greater species turnover. Morphological analysis identified the instability dynamics of unvegetated sediment bars, in contrast to the stability of vegetated bars, which were only significantly reshaped by extreme hydrological events.It is concluded that the interaction among hydrology, geomorphology, and vegetation constitutes a non-linear system, sensitive to specific hydrological thresholds, with seasonality acting as a key driver of morphodynamics and ecological organization in non-perennial channels. These findings highlight the importance of incorporating eco-hydrological and biogeomorphological approaches in the understanding and management of fluvial systems in semi-arid regions. Editor: Universidade Federal da Paraíba Tipo: Tese

2026-02-20T00:00:00Z Andrade, Maria Lidia dos Santos https://repositorio.ufpb.br/jspui/handle/123456789/38020 2026-05-11T06:05:09Z 2026-01-26T00:00:00Z

Título: Entre a contaminação e a escassez hídrica: uma análise dos riscos associados à qualidade da água do Riacho Agon, Catolé do Rocha - PB Autor(es): Andrade, Maria Lidia dos Santos Orientador: Suertegaray, Dirce Maria Antunes Abstract: The analysis of water contamination resulting from changes in land use and land cover is crucial for assessing environmental impacts and the risks associated with water quality. Thus, the present study aims to investigate water conditions through correlations between environmental constraints, land use and land cover, and water quality in the Agon stream microbasin. To this end, land use and land cover mapping of the area of interest was performed using data from the MapBiomas project, alongside water sampling (surface and groundwater) for the analysis of physical, chemical, and microbiological parameters. To understand the degree of aquifer vulnerability in the Agon stream microbasin, the GOD method (Groundwater occurrence, Overall lithology, and Depth to water table) was employed. The generated data allowed for an integrated analysis of the parameters established by the Ministry of Health (Ordinance 888/2021) and the CONAMA Resolutions (No. 357/2005 and No. 396/2008). The relevance of this study is justified by the microbasin’s location in the Brazilian Semi-arid region, a region characterized by a negative water balance, which reinforces the importance of conserving existing water resources. Additionally, there is a scarcity of research focused on understanding how water contamination in the local context can increase water scarcity in the region. Therefore, there is a need for detailed analyses regarding contamination and water scarcity, as water pollution represents a serious risk to public health and ecological balance. The juxtaposition of environmental characteristics — an unconfined alluvial aquifer embedded in crystalline geology, under a semi-arid climate with fluctuations in annual and interannual rainfall patterns, intermittent flow, and intense land use and cover — combined with high aquifer vulnerability (GOD index of 0.56), resulted in a critical situation in the Agon stream microbasin. The results revealed that the water is unfit for consumption at all sampling points due to microbiological contamination, high nitrate levels, and other physical-chemical alterations (turbidity and Total Dissolved Solids - TDS). This reality found in the Agon microbasin is dialectically contradictory: it is an area that, while facing socioeconomic and environmental difficulties related to water scarcity, is simultaneously submerged in a logic of significant contamination Editor: Universidade Federal da Paraíba Tipo: Dissertação

2026-01-26T00:00:00Z Silva, Rodrigo Brito da https://repositorio.ufpb.br/jspui/handle/123456789/38014 2026-05-10T06:06:48Z 2023-12-15T00:00:00Z

Título: Território e práticas agrícolas no município de Lagoa Seca/PB: espaço de disputas e de luta para a produção de alimentos saudáveis Autor(es): Silva, Rodrigo Brito da Orientador: Galvão, Josias de Castro Abstract: This dissertation addresses the initiatives of civil society and public organizations aimed at strengthening agroecological actions in the municipality of Lagoa Seca, Paraíba, Brazil. The objective of this research is to analyze the construction of territoriality by the National Articulation of Agroecology (ANA), in Lagoa Seca/PB, demonstrating its contribution in the production of new socio-spatial dynamics in the countryside, from the agroecological transition and in the confrontation of the practices disseminated by the green revolution. The qualitative research relies on primary sources, such as ANA documents and interviews with representatives of the entities. The starting point is the historical rescue of the research region, seeking to perceive the territorial organization of the territory at different scales, according to its specificities and characteristics. It is well known that the construction of an alternative production territory is a long and complex process. However, the process of articulation and agroecological transition presents itself as a social contribution, as it creates models of projects to be followed in other locations and at different scales, seeking the implementation of public policies that rekindle the hope of a healthier countryside. We conclude that ANA, by representing organizations, establishes the process of forming an agroecological field in the country, a notion of agroecology with the objective of materializing public policies in favor of society and which has positively affected its performance in productive changes in the field in Lagoa Seca/PB. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2023-12-15T00:00:00Z Vasconcelos, Gustavo Ferreira de https://repositorio.ufpb.br/jspui/handle/123456789/37738 2026-02-27T06:08:33Z 2025-12-16T00:00:00Z

Título: Influência de estruturas artificiais na dinâmica costeira em praias de João Pessoa/PB Autor(es): Vasconcelos, Gustavo Ferreira de Orientador: Silva, Richarde Marques da Abstract: This study analyzes the coastal shoreline dynamics and the processes of erosion, stability, and sedimentation, establishing a connection between natural and artihropogenic aspects along Seixas and Cabo Branco beaches, in Paraiba State (Brazil). The research hypothesis assumes that the beach morphology and sedimem budget of these areas are influenced by rigid artificial structures built along the shoreline. Thus, the aim of this stady was to analyze the influences of rigid trtificial structures on the local hydrodynamic and morphosedimentary processes of Seixas and Cabo Branco beaches in João Pesson-PB. To achieve these goals, the following methodological procedures were adopted: (1) monitoring four transversal topographic profiles (P1 to P4) along the shadied beaches over a 13-month period to observe beach morphology dynamics; (2) quantifying sediment balance during the study period across the four transversal profiles, (3) estimating shoreline changes through a multitemporal analysis (2016-2024) using the CASSIE platform, and (4) Atalyzing marine hydrodynamics using the SMC-Brasil model for the period from 1948 to 2008. The results showed that profile P1 (near Cabo Branco viewpoint) presented slight accretion (3.38 m³/m), probably due to wave reflection generated by the nearby structure: profile P2 (near the Cabo Beatco cliff), a sector with riprap, also showed mild accretion (2.06 m³/m), profile P3 (located on the sandy point of Seixas bench) recorded higher accretion (8.60 m²/m), whereas profile P4 (the southernmost profile) exhibited accelerated erosion (-9.04 m/m). Regarding shoreline changes, the northern portion of Cabo Branco beach (transects 9 to 50) was characterized by stability or accretion, while transects 51 to 105 (southern portion) showed a predominant erosive trend. Transects 115 to 117 (the sandy point at the northern part of Seixas bench) displayed a tendency toward accretion. In contrast, iransects 106 to 114 and 118 to 147 (central and southem portions of Seixas beach) were predominantly stable to accretion. As for marine hydrodynamics, the results indicate that during periods of higher meteorological energy, such as winter and spring, currems, winds, and waves become more effective, producing higher sediment transport rates. However, the mean transport/flow outputs geherited by the SMC model revealed predominantly negative sediment transport values across four of the five transversal profiles, except for profile 4, which remained positive throughout all analyzed periods. In summary, the findings highlight the complexity of this coastal environment, which is constantly changing depending on natural energy variations, as well as athropogenic interferences that restrict natural sediment mobility, thereby generating or intensifying several envirımmental problems in the area. Editor: Universidade Federal da Paraíba Tipo: Tese

2025-12-16T00:00:00Z