Estimación y análisis de la variabilidad espacial y temporal de la dispersividad local efectiva a partir de ensayos en tanque experimental
[EN] The remarks of field, of experiments and real cases of pollutants' migration in groundwater where there have been identified phenomena or behaviors named like “Anomalous transport”, have been an object of diverse research works in the above mentioned decades. Nevertheless few of these...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | español |
| OAI Identifier: | oai:riunet.upv.es:10251/67881 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/67881 |
| Access Level: | acceso abierto |
| Palabra clave: | Dispersividad Transporte anómalo Modelos numéricos Dispersivity Anomalous transport Numerical models FISICA APLICADA Máster Universitario en Ingeniería Hidráulica y Medio Ambiente-Màster Universitari en Enginyeria Hidràulica i Medi Ambient |
| Sumario: | [EN] The remarks of field, of experiments and real cases of pollutants' migration in groundwater where there have been identified phenomena or behaviors named like “Anomalous transport”, have been an object of diverse research works in the above mentioned decades. Nevertheless few of these works are based on real cases with laboratory information, principally for the need to have a sufficient quantity of information to be able to realize a good work. The limitations of the equation of the transport of mass (ADE) to describe the real experiences, do that a parameter as the dispersivity, whose formal definition refers only to properties of the physical way, in practice is an effective parameter that integrates the effect of the advection to scales lower than those of the discretización of the model, and turn into an adjustment parameter to information observed that integrates other limitations of the equation of the transport. The experiments realized in the UPV for (I. Sánchez, J. Capilla, 2008-2011), they provide exhaustive information obtained with a conserving tracer in laboratory tank to intermediate scale. With this information diverse research works have being realized and they have gone so far as to estimate local effective values of the dispersividad. Nevertheless, the available information allows to come very much further appearing even targets of major scope with regard to the proper reformulation of the classic methods of modeling of the transport (ADE) as for the consideration of the dispersividad. Nevertheless, this needs a deeper analysis with the available information of what up to the date could have reached. The present work uses the obtained information of one of the laboratory experiences indexed previously. The information of the information is processed to three scales different from discretización, with the target to realize the estimation of the instantaneous local dispersivity to different scales. For this there has been used an approximate and simplified method of inverse modeling specifically for this case, which allows us to estimate components convective and dispersive that there is part of the process of transport of soluto all the time of weather. Thanks to the wide information with which he gets ready there has been observed the changeability and behavior of the components convective and dispersive estimated all the time of weather and the relation that they save between the different scales support. Due to the big heterogeneity of the way it was possible to have observed phenomena of the anomalous transport. And it was observed that the dispersividades estimated all the time for every element save a relation with the evolution of the gradient of concentration and of the material of the one that the way is composed, this relation seems to be supported between the analyzed support scales. It was possible to have seen that the local dispersividad estimated to the being an effective parameter, changes in the weather and the space, it maintains a relation with the hydraulic conductivity, and has dependence with the concentration change in every element to different scales. The mathematical modeling has been realized by means of MT3D in which one has introduced the estimated values of dispersividad that contain proper information of the way in every analysis scale. Of general form in the first moments there are observed the limitations of the classic equation of the transport (ADE) on not having integrated the gravitational effects. In addition to the limitations that it has to be able to reproduce phenomena or behavior named like “anomalous transport”. This work has been realized by means of simplified concepts, in which there can get criteria and additional methods that allow to realize a more detailed analysis, which there can be threads of new studies introducing some methods: Methods of calibration of the porosity and conductivity. Methods alternatives to introduce the gravitational effects. To see if it is possible to establish a simplified relation that allows to shape the behavior of the instantaneous local dispersividad from the values of concentration and instantaneous local speeds. To see some alternative of integrating the temporary changeability of the dispersividad in the modeling of transport of mass. Theoretical numerical simulation using different values of dispersividad local snapshot realizing a results comparison. |
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