Banca de QUALIFICAÇÃO: BRUNO BARAUNA DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : BRUNO BARAUNA DOS SANTOS
DATE: 17/12/2020
TIME: 14:00
LOCAL: https://meet.google.com/iqu-njvn-zie
TITLE:

2D modeling of GPR data including dispersion

KEY WORDS:

GPR; Numerical modeling; Dispersion; gprMax.

PAGES: 25
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The quantitative interpretation of GPR data is quite complex. Numerical modeling using the finite difference method in the time domain (FDTD) can play a key role in the interpretation since it can simulate complex geological scenarios. In order to make synthetic GPR sections as realistic as possible, it is essential to implement the dispersion effect. This effect causes changes in the pulse shape, usually introducing a temporal stretching with consequent loss of resolution. This effect can be introduced through the dispersion / attenuation model of the constant quality factor (Q). In this approach, the attenuation factor is independent of frequency, an hypothesis that is approximately valid for rocks within the typical GPR frequency range (10 MHz to 1 GHz). The crucial question is how to introduce a Q constant model in time domain modeling. In this work, we investigate the approach of modifying the open access software gprMax, aiming to simulate a constant Q model, within the useful frequency range of GPR, using Debey's relaxation model with several poles. We are treating the problem of obtaining the most suitable poles as an inverse problem, and obtaining the best solution through the global optimization search algorithm COMPLEX.

BANKING MEMBERS:
Externo ao Programa - 1675166 - JOSIBEL GOMES DE OLIVEIRA JUNIOR
Externo à Instituição - RENATO RAMOS DA SILVA DANTAS - UFRN
Presidente - 349684 - WALTER EUGENIO DE MEDEIROS