Banca de DEFESA: Eliu James Carbajal Salinas

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Eliu James Carbajal Salinas
DATE: 09/09/2022
TIME: 14:00
LOCAL: TEAMS
TITLE:

Transient and Unsaturated Modeling of Contaminant Transport Applied to Laboratory Column Test with Tailings.

KEY WORDS:

Unsaturated Flow, Tailings, Column Tests and Numerical Analysis.

PAGES: 104
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Mining is an important economic activity in the modern world. However, despite the benefits generated, mining produces huge volumes of tailing, an environmental liability with numerous damages. The most common way to store it is through tailing dams. Also, it is essential that during its operation the correct functioning of the drainage and filtration systems are guaranteed, in order to make it difficult for the solute to move throughout its useful life of the mine and after its closure. Research on the transport of contaminants in tailing dams is important to assess the degree of contamination and propose preventive or corrective measures. In geotechnical practice, solute flow is generally characterized by the numerical solution of the Richards equation to describe the movement of water coupled to the advection-dispersion equation for two water fractions (mobile and immobile) to describe the movement of the contaminant. This study aimed to model and simulate the transport of contaminants in an experimental column, using a new analytical formulation and mathematical algorithms, through tailing in unsaturated transient conditions. The analytical solution for the Richards equation was used to simulate the variation of the volumetric water content and to determine the transient contaminant plume using the advection-dispersion equation to two fractions of water (static and in movement), afterwards. The models were used to calibrate experimental data from hydraulic characterization and contamination tests. Finally, the normalized contaminant plume (cw/c0) was simulated as a function of time and space. Comparisons with experimental data showed that the analytical formulations adequately expressed the process of infiltration of contaminants through the unsaturated porous medium. The offered formulations behaved effectively and configures themselves as a new approach to solve various contamination problems in unsaturated transient conditions, providing information about many complex processes that occur in laboratory tests and requires much less computational effort compared to the current programs to model solute transport using numerical methods.

BANKING MEMBERS:
Externa à Instituição - ELISABETH RITTER - UERJ
Presidente - 1805002 - ANDRE LUIS BRASIL CAVALCANTE
Interno - 404575 - NEWTON MOREIRA DE SOUZA
Externo à Instituição - Silvio Crestana - EMBRAPA