Análisis de la influencia de la heterogeneidad del medio en fenómenos de densidad variable dentro de un acuífero insular

dc.contributor.advisorDonado Garzón, Leonardo Davidspa
dc.contributor.authorTinjacá Jiménez, Nathalia Katerynespa
dc.contributor.researchgroupHydrodynamics of the natural media research groupspa
dc.date.accessioned2020-07-14T02:29:15Zspa
dc.date.available2020-07-14T02:29:15Zspa
dc.date.issued2020-06-05spa
dc.description.abstractThe research about the groundwater variable-density flow is essential for the human activity and supply of water resources, thereby, the study of this phenomenon include different fields of application, for example saltwater intrusion, the generates of freshwater lenses, upconing, inland salinity, among others. The research advance allows to know variety of studies about the saltwater intrusion, however, the investigation regarding the physical model experiments for the formation of lenses and upconing in heterogeneous aquifer is reduced. This research project is focused on two important processes that take place on an insular aquifer i) the formation of freshwater bodies in the aquifer, called lenses and ii) Upconing in a well. Physical 2D experiments in laboratory were implemented to analyze the effects of the stated process were used with two sandtanks, each of two represents a homogeneous and heterogeneous media. The homogenous media was represents using sand of known gradation (size #20 grain diameter 0.85 mm) and heterogeneous media using three types of sand (sizes #20, #40 grain diameter 0.43 mm and #60 diameter 0.25mm). The hydraulic and transport parameters were estimated by experimental methods. To simulate recharge, individual freshwater drips were installed above the sand cone, connected to a peristaltic pump and with different colors, the flow path lines were seen. Tubes with different length were installed within a freshwater lens and the interface geometry was modified by experimental methods of injection and pumping of freshwater rate. The experiment was made under various freshwater rates in the recharge and the pump. Different rates of freshwater were used to created different scenarios of lenses. Results of physical model were compared to analytical model, numerical model in FEFLOW 7.2 and a geophysical model in AGI-EarthImager 2D.spa
dc.description.abstractLos estudios concernientes que existen actualmente acerca de la formación del lente de agua dulce y el fenómeno upconing en acuíferos insulares heterogéneos es escasa. El propósito general de este trabajo, consiste en analizar la influencia de la heterogeneidad del medio que se presenta en acuíferos insulares en dos principales fenómenos de densidad variable: la formación del cuerpo de agua dulce y el fenómeno de upconing o formación de un cono de salinización que tiene lugar debajo de un pozo. Se realizaron modelos físicos 2D en laboratorio con dos cajas de arena, representando cada medio de estudio, con el fin de modelar los fenómenos que se llevan a cabo dentro del acuífero. Posteriormente se simularon numéricamente los dos procesos ensayados en el modelo físico mediante la herramienta FEFLOW 7.2; para luego comparar los resultados con los obtenidos en el modelo experimental. Adicionalmente se realizó un ensayo de tomografía eléctrica al modelo físico para los dos medios simulados. Lo anterior con el objetivo de realizar un análisis comparativo junto con los resultados de los otros modelos. Los resultados del modelo físico para el medio homogéneo en la generación del cuerpo de agua dulce y upconing mostraron una similaridad en la profundidad del lente frente a los resultados calculados a partir de los modelos teóricos y simulados numéricamente; sin embargo, los resultados del modelo físico para el medio heterogéneo mostraron diferencias notables con los otros dos modelos, llegando así a concluir que los modelos analíticos no tienen aplicabilidad para medios heterogéneos y que los modelos simulados numéricamente tuvieron la necesidad de ser calibrados. Adicionalmente, la tomografía eléctrica, mostró resultados no representativos a la realidad debido a dificultades presentadas en el montaje de los equipos.spa
dc.description.degreelevelMaestríaspa
dc.format.extent211spa
dc.format.mimetypeapplication/pdfspa
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dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/77768
dc.language.isospaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.programBogotá - Ingeniería - Maestría en Ingeniería - Recursos Hidráulicosspa
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dc.rightsDerechos reservados - Universidad Nacional de Colombiaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.spaAcceso abiertospa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.ddc620 - Ingeniería y operaciones afines::627 - Ingeniería hidráulicaspa
dc.subject.proposalFreshwater lenseng
dc.subject.proposalLente de agua dulcespa
dc.subject.proposalMedio heterogéneospa
dc.subject.proposalHeterogeneous mediaeng
dc.subject.proposalUpconingeng
dc.subject.proposalUpconingspa
dc.subject.proposalSimulaciónspa
dc.subject.proposalSimulationeng
dc.titleAnálisis de la influencia de la heterogeneidad del medio en fenómenos de densidad variable dentro de un acuífero insularspa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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