Examinando por Materia "Aburrá Valley"

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    Analysis of the radial and tangential soil pressure on pipes installed by the pipe jacking method in the Aburrá Valley
    (Universidad EAFIT, 2019) Otálvaro Velásquez, Sergio Andrés; Montoya Noguera, Silvana
    In the pipe jacking design, it is required the estimation of radial and tangential pressures exerted by soil on pipes, to determine the jacking forces that need to be achieve to overcome the frictional resistance during the installation process. This document presents theoretical methods that can be used to compute the external pressures on pipes and jacking forces, especially in cohesionless soils where the frictional component is determinant in the jacking process. In addition, several analyses are presented of how these calculations are affected by the variability of the geotechnical parameters of soils in the Aburrá Valley. Additionally, a comparison between computed values and field data recorded from two projects developed in the Aburrá Valley are presented, in order to analyze how well the computed values, approximate the real data. The comparison showed that theoretical models tend to overestimate the real behavior recorded in the projects, however, this overestimation provide a safety factor that must be optimized by the designer of a future pipe jacking project.
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    Cambios en el uso del suelo y su incidencia en la concentración y deposición de nitrogenados en el modelo de química de transporte LOTOS-EUROS para el Valle de Aburrá
    (Universidad EAFIT, 2021) Sánchez Aguirre, Andrés Felipe; Zapata Correa, Juliana; Yarce Botero, Andrés; López Restrepo, Santiago
    Conservation in the new century presents a multitude of challenges that are growing. One of the main challenges is the change in land use because it generates many transformed spaces that are constantly expanding and negatively affect the atmosphere, climate, ecosystems, and human health. Consideration in the land cover or use changes, together with transport chemistry models, enables the analysis of posible causes and consequences of future atmospheric dynamics in various temporal or spatial scenarios. The objective is to evaluate the variables of NOy Dry Deposition and NOx Surface Concentration, predicted by the LOTOS-EUROS transport chemistry model, when subjected to different land-use scenarios of the Aburrá Valley, generating an approximation to evaluate and predict the consequences of cover changes on the atmospheric dynamics of nitrogen and its possible effect on the surrounding ecosystems. This study analyzes different perspectives from the implementation for a case study in the Aburrá Valley of a chemistry-transport models as an important urban planning tool.
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    Caracterización geoeléctrica del acuífero libre del suroccidente del Valle de Aburrá, a partir de tomografías eléctricas calibradas con un modelo geológico inicial y de física de rocas
    (Universidad EAFIT, 2020) Ospina Benítez, David; Vanegas Cubillos, Sebastián; Jaramillo Uribe, Marcela; Restrepo Correa, Isabel Cristina
    The initial geological (IGM) and rock physics (RPM) models are important tools in the processes of geophysical inversion (electrical resistivity tomography) and their interpretation, when they are used in order to achieve the stratigraphic and hydrogeological characterization of a zone of study. The IGMI and RPM are built from the processing of primary and / or secondary information, generating a schematic representation of the area which contributes to the understanding of the physical properties of the materials. These initial models must be implemented for the interpretation of data in shallow geophysics. In the case of electrical tomography, the interpretations depend largely on the quality of the field data, the processing and the amount of geological information available. The implementation of IGM and RPM is a fundamental tool to reduce the uncertainty related to the problem of non-uniqueness in geoelectric investments. For the construction of the IGM of the study area, the available geological cartography and stratigraphic columns were considered, this information allowed to perform stratigraphic correlations and geological profiles. While for the RPM, the information used was apparent resistivities of materials in the study area and their granulometric characteristics. Geological sections, stratigraphic correlations, and expected resistivity ranges in the materials in the study area are the most important parameters in the interpretation of electrical tomography. This study analyzes the case of the unconfined aquifer of Valle De Aburrá defined by AMVA and UdeA (2012), AMVA and UdeA (2013) of the southwestern zone, where it is mainly composed of unconsolidated deposits. Through geophysical interpretation it was found that the materials that composed these deposits in the study area have textural variations and, therefore, their classification and their hydrogeological behavior are heterogeneous.
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    Estudio de prefactibilidad para el montaje de un taller de mantenimiento y reparación de vehículos eléctrico e híbridos
    (Universidad EAFIT, 2023) Gómez Ortiz, Sebastián; Carmona Arboleda, Frank Esteban; Díez Benjumea, Jhon Miguel; Múnera Hoyos, Diego
    Based on secondary information obtained for the development of this research work, it was determined that due to different factors of the world environment and international policies such as the UN Sustainable Development Goals, in the world they are massifying electric and hybrid vehicles, for which according to experts consulted, in some countries there are no after-sales services that can guarantee proper maintenance and/or repair. Due to the above, based on the identified need, through this research work it is intended to evaluate the pre-feasibility for the assembly of a repair and maintenance workshop for electric and hybrid vehicles in the Aburrá Valley, using the methodology proposed by UNIDI for the preparation of projects, with which it was concluded that probably in the short term there is no demand to make the project viable.
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    Measurements of urban aerosol properties by developing a scanning depolarization lidar system
    (Universidad EAFIT, 2022) Hoyos Restrepo, Manuela; Montilla Rosero, Elena
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    Modelo cronoestratigráfico para el emplazamiento de los depósitos de vertiente en el Valle de Aburrá.
    (Universidad Nacional de Colombia, 2006) Rendón G., Diego Armando; Toro V., Gloria Elena; Hermelin Arbaux, Michel; Universidad EAFIT. Departamento de Geología; Diego Armando Rendón G. (drendong@eafit.edu.co); Gloria Elena Toro V. (gtoro@eafit.edu.co); Michel Hermelin Arbaux (hermelin@eafit.edu.co); Geología Ambiental e Ingeniería Sísmica (GIGAI)
    This paper presents new stratigraphic and chronologic data related with a widespread and complex sequence of slope deposits located at "El Poblado" sector, southeast area of the Medellín City, and Envigado County. Geomorphologic cartography, stratigraphic work in civil excavations, and fission track ages of interbedded volcanic ash deposits let us to divide the slope deposits in at least four stages: I, II, III, and IV. Such slope materials, mainly mud and debris flows, present a staircased distribution (telescopic). The oldest deposits, stages I and II, crop out on the middle and higher parts of the slope; while the younger ones, stages III and IV, show wide and nicely preserved fan shape over slope foothills. The oldest ages found in volcanic zircons (obtained around 30 m depth) reach 2.63 Ma, Early Pliocene, representing the maximum age of stage I, which lower age is approximately 1.8 Ma. Stage II has a wide thickness range, and ages between 2.0 and 0.9 Ma, Late PliocenePleistocene. Finally, behind deposits belonging to stage III, other authors report peat layers with ages beyond of the application time span of C14 method (older than 40k.a.). In addition, several basement zircons were found in the deposits, with ages between 45 and 48 Ma.
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    Travesías liminalizadas : exploraciones de arte, política y experiencias performativas en el Valle de Aburrá
    (Universidad EAFIT, 2024) González Serna, Emmanuel; Cardona Z., Patricia