PPGECAM https://repositorio.ufpb.br/jspui/handle/tede/5433 2026-07-14T05:31:52Z 2026-07-14T05:31:52Z Oliveira Júnior, Marcos Elias de https://repositorio.ufpb.br/jspui/handle/123456789/38244 2026-06-27T06:13:16Z 2024-09-30T00:00:00Z

Título: Modelagem da evapotranspiração usando balanço de energia e imagens de aeronaves remotamente pilotadas Autor(es): Oliveira Júnior, Marcos Elias de Orientador: Melo, Davi de Carvalho Diniz Abstract: Evapotranspiration (ET) encompasses both soil water evaporation and plant transpiration and is a key process in maintaining the water and energy balance at the Earth's surface. It is divided into three components: soil evaporation, canopy transpiration, and interception of water retained by the canopy. The Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) model is widely used for ET estimation; however, it does not include a robust method for integrating thermal data obtained by UAVs. This study aims to map ET using meteorological data and aerial images acquired by UAVs in a sugarcane cultivation area in the northern coastal region of Paraíba, Northeast Brazil. Additionally, it proposes to evaluate how the QGIS plugin QWaterModel can be integrated into models such as PT- JPL to improve the accuracy of evapotranspiration estimates. To achieve this, a performance analysis was conducted comparing the ET simulated by the models (QWater and PT-JPL) with observed ET values from a flux tower installed in a sugarcane field in the coastal region of Paraíba between October 2022 and August 2023. By combining PT- JPL with QWaterModel, this study seeks to enhance ET estimation accuracy, particularly in an agricultural context such as a sugarcane field. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2024-09-30T00:00:00Z Siqueira, Ana Clara Ferreira https://repositorio.ufpb.br/jspui/handle/123456789/38099 2026-05-18T06:07:41Z 2025-07-31T00:00:00Z

Título: Estudo analítico-numérico de placas submetidas a ações pontuais e distribuídas em linha Autor(es): Siqueira, Ana Clara Ferreira Orientador: Mendonça, Ângelo Vieira Abstract: This work aims to discuss aspects of obtaining analytical and numerical solutions for plate problems, with or without elastic foundation support, subjected to point loads and/or line-distributed loads, using Kirchhoff and Mindlin plate theories. The analytical solutions for these problems were derived by manipulating the Dirac delta function (δ) for concentrated loads and the Heaviside function (H) for line distributions. Additionally, the strategies for obtaining the analytical solutions were based on the Levy and Navier methods. To enable numerical solutions for the plate problems, stiffness matrices associated with Winkler and Pasternak foundations were derived through mathematical manipulations compatible with the finite element formulations of DKT (Discrete Kirchhoff Triangle) and DST (Discrete Shear Triangle) elements, combined with linear or pseudo-consistent interpolations of transverse displacements within the element domain. Several analyzes were carried out involving different properties, boundary conditions and loading, the results of which were validated with analytical and/or numerical responses Editor: Universidade Federal da Paraíba Tipo: Dissertação

2025-07-31T00:00:00Z Rodrigues, Moab Bezerra https://repositorio.ufpb.br/jspui/handle/123456789/38097 2026-05-18T06:07:19Z 2026-03-27T00:00:00Z

Título: Análise dinâmica de placas duplas e delgadas pelo método dos elementos de contorno Autor(es): Rodrigues, Moab Bezerra Orientador: Mendonça, Ângelo Vieira Abstract: Plates are structural elements widely used in engineering applications, appearing in fields such as Civil Engineering, Mechanical Engineering, and Aerospace Engineering. Double- plate systems, in particular, are found in sandwich structures, nanometric structures, and highway and railway pavements, the latter two often being subjected to dynamic loading conditions. Accurate analysis of these systems is essential, especially when their interaction with elastic foundations is considered. Although analytical solutions are important, they are frequently restricted to simple geometries and boundary conditions, which limits their applicability. In this context, the primary objective of this work is to develop numerical solutions, using the Boundary Element Method (BEM), for thin double-plate systems connected by a Winkler elastic foundation under steady-state dynamic conditions. In addition, secondary discussions are extended to isolated single plates or single plates supported by a Winkler elastic foundation. The construction and validation of the numerical solutions presented in this study follow these steps: initially, the differential equations of motion defined in the continuous medium (plate) are transformed into equivalent integral equations valid over the domain and/or boundary of the plate through the application of the weighted residual method (where the equations of motion are weighted by fundamental solutions). A key contribution of this work is the original derivation of the fundamental solutions for the dynamic problem of double plates, which were previously unavailable in the literature. The discrete solution of the dynamic plate problem is obtained by discretizing the boundary into linear isoparametric boundary elements. After evaluating the corresponding integrals, an algebraic system is assembled. Finally, once the boundary conditions are imposed, the dynamic responses can be determined. Several examples using the BEM solution are presented and validated against analytical and/or numerical solutions, yielding relative errors lower than 1% for a discretization with 32 straight elements in rectangular plates and 8 curved (arc) elements in circular plates, implying on consistence of BEM solution showed. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2026-03-27T00:00:00Z Souza, Sara Angélica Santos de https://repositorio.ufpb.br/jspui/handle/123456789/38094 2026-05-18T06:07:43Z 2026-03-10T00:00:00Z

Título: Drenagem urbana e soluções baseadas na natureza : estratégias para o controle de alagamentos em João Pessoa, Paraíba Autor(es): Souza, Sara Angélica Santos de Orientador: Silveira, José Augusto Ribeiro da Abstract: The intensification of urbanization and the increase in soil impermeabilization have amplified the occurrence of urban flooding. This research analyzed how urban drainage is addressed in the normative instruments of the municipality of João Pessoa, Paraíba, evaluating the potential for incorporating sustainable measures based on Nature-based Solutions (NbS) as a complementary strategy to mitigate the hydrological impacts associated with flooding events. The study combined documentary analysis of municipal legislation, interviews with two public managers, and hydrological modeling using the Storm Water Management Model. The empirical application was conducted in the Torre neighborhood, where critical rainfall scenarios were simulated with the implementation of permeable pavements and rain gardens in 50% of the analyzed impermeable area. The results indicate that, although there are instruments related to sanitation and climate adaptation, sustainable drainage is not yet fully institutionalized in the municipality. The interviews revealed technical recognition of the importance of NbS, but also pointed to normative, financial, and institutional barriers. The modeling indicated a significant reduction in the maximum water depth and accumulated volume. Regarding the maximum accumulated volume, Section 2 presented the most expressive result, with a reduction of 82.7%, suggesting greater sensitivity to the implemented interventions. This behavior indicates that the adopted measures acted efficiently in retaining and infiltrating water at the source, delaying surface runoff. Concerning maximum water depths, Section 1 showed the greatest reduction compared to the other sections, reaching 33%, which may be associated with hydraulic limitations of the inlet structures present at the site. Regarding the emptying time, Section 2 also showed the greatest reduction (17%). The more modest results suggest that the final runoff remains conditioned by the structural capacity of the existing drainage network. In other words, drainage efficiency continues to be limited by the installed infrastructure. It is concluded that the implementation of NbS is feasible and necessary; however, it depends on legislative advances, intersectoral integration, and the strengthening of specific public policies for sustainable urban drainage. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2026-03-10T00:00:00Z