Banca de QUALIFICAÇÃO: GUILHERME ANTONIO RIBEIRO DE SOUZA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : GUILHERME ANTONIO RIBEIRO DE SOUZA
DATE: 12/06/2023
TIME: 14:30
LOCAL: https://conferenciaweb.rnp.br/webconf/hersilia-de-andrade-e-santos
TITLE:

INFLUENCE OF TURBULENCE ON THE BEHAVIOR OF TROPICAL AQUATIC COMMUNITIES

KEY WORDS:

Ecohydraulics, Ichthyofauna, benthic macroinvertebrates, hydroelectric plants, environmental impact, mesocosm, CFD

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Engenharia Hidráulica
SPECIALTY: Hidráulica
SUMMARY:

Rivers are complex and dynamic systems that, due to their connections with the biological characteristics of the aquatic communities and their great anthropic pressure, demand compression of their biotic and abiotic aspects. Hydrologic and hydraulic patterns of freshwater lotic systems are equally important to aquatic community structure and ecosystem functioning. Aquatic ecosystem disturbances occur when these patterns are altered by human use.. There is the interdisciplinary approach of Ecohydraulics, which integrates knowledge from biology (ecology), geomorphology, and also physics (hydrology, hydraulics) and focuses on detailing the processes that occur in physical habitat to understand the causal mechanisms between fluid dynamics and the behavioral patterns of aquatic communities. Microscale analysis (<10^-1 m) of the hydraulic parameters of a flow has allowed understanding the movement of fish and macroinvertebrate communities and to obtain information on the impact generated by changes in these parameters on the respective communities. Variables known as standards in ecohydraulics were used for this purpose: velocity and flow depth. However, these variables use time-averaged parameters and therefore do not describe all ecologically relevant flow aspects. Turbulence, in turn, accounts for temporal variation of fluid velocity and has been measured and simulated thanks to advances in instrumentation and numerical modeling techniques. Thus, the present doctoral work has the general objective of analyzing how the effects of turbulence act on the behavioral patterns of tropical aquatic communities to mitigate the effects of urban impacts and hydroelectric plants (HEP). Therefore, we attempt to answer the following research questions:

1. How do hydraulic variables of flow explain the presence or absence of the species Pimelodus maculatus (mandi) and Prochilodus argenteus (curimba) in the tailrace of a HPP?

2. Where in the world are there studies of turbulence in macroinvertebrate behavior?

3. How is biological information (preference curve, video, drift samples) obtained in macroinvertebrate physical habitat studies?

4. How is the habitat sampled (in the laboratory (like mesocosm), in-situ, or mesocosm near the river)?

5. What are the characteristics of hydrodynamic models used in macroinvertebrate studies (2D or 3D, commercial software, open source or proprietary code)?

6. When simulating the behavior of macroinvetebrates, which assumption is used to perceive the hydraulic field (the individual moves by velocity, flow, turbulence, or substrate)?

7. Does turbulence significantly explain macroinvertebrate fixation in urban streams?

8. Does turbulence explain macroinvertebrate fixation in urban streams better than other hydraulic variables (flow, velocity, substrate)?

9. What is the best turbulence model to represent the physical habitats of macroinvertebrates?

10. What are the implications of including turbulence preference curves in physical habitat simulation for macroinvertebrates? Currently, only velocity, depth, and substrate are considered.

COMMITTEE MEMBERS:
Interno - ROGERIO CABRAL DE AZEVEDO
Interna - HERSILIA DE ANDRADE E SANTOS
Externo à Instituição - Bernardo Alan de Freitas Duarte - UFU
Externo à Instituição - MARCOS CALLISTO DE FARIA PEREIRA