Banca de DEFESA: GABRIELLA MOREIRA CAMPOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GABRIELLA MOREIRA CAMPOS
DATE: 21/02/2022
TIME: 09:00
LOCAL: meet.google.com/dwk-wtrw-gah
TITLE:

Hydrosedimentometric parameters in transient flow condition of channel with vegetated wall in semiarid environment.

KEY WORDS:

Open channel; Sediment transport; Hydraulic resistance; Drag coefficient.

PAGES: 65
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Vegetation, when present in watercourses, plays a fundamental role in hydrodynamic processes, mainly due to flow resistance, reducing the shear forces of the flow, as well as the concentration of suspended solids and the bed load transport. This work aims to review and discuss the complex interaction between vegetation, water flow and ephemeral channel sediment transport in a semiarid watershed. During the rainy season, fifteen campaigns of direct measurements were carried out, where the hydrosedimentometric, vegetative and resistance parameters generated by Ipomoea pescaprae (Beach Morning Glory) species were determined. The flow regime was characterized as Fluvial Turbulent, according to the Reynolds (Re) and Froude (Fr) numbers. The results reveal that the maximum velocity (Umax) in the non-vegetated region was on average 40% higher than the observed (U), and in the vegetated region, right and left margins, the difference between Umax and Uveg was very sharp, on average 63% higher. The distribution of shear stress, as well as for the velocity profiles, showed peaks in the central region of the cross-section, without vegetation. The highest values of the conventional resistance variables, Manning number (n) and Darcy-Weisbach coefficient (f) were concentrated in the left bank in the cross-section, where the highest concentration of I. pes-caprae stems occurred. Number of stems and plant density had a notable impact on the flow structure, observed in the coefficients of plant resistance or plant drag, FD and C'D, in the region with greater vegetation. In general, the vegetation present on the banks influenced the estimates of the flow and transport of sediments, shifting the velocity and maximum tensions to the central region and lower levels, being a parameter of vital importance for the evaluation, study and mitigation of extreme events, such as floods or inundations.

BANKING MEMBERS:
Interno - 6383037 - BRIVALDO GOMES DE ALMEIDA
Presidente - 057.813.304-02 - DOUGLAS MONTEIRO CAVALCANTE - UFRPE
Externa à Instituição - MONALIZA ALVES DOS SANTOS