Banca de DEFESA: WILK SAMPAIO DE ALMEIDA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : WILK SAMPAIO DE ALMEIDA
DATA : 20/12/2018
HORA: 08:30
LOCAL: Sala 24 - Departamento de Solos
TÍTULO:

Disaggregation index of daily rain and IDF relationships for the Rio de Janeiro State and effect of simulated rain duration and intensity on erosion and soil water infiltration

PALAVRAS-CHAVES:

Interrill erosion, erosivity index, soil water loss, runoff

PÁGINAS: 120
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:

The scarcity of rainfall information is the main limiting factor for the characterization of the erosive potential of a given region and the estimation of critical rainfall for use in the design of hydraulic works. In addition, inadequate soil management practices intensify the process of water erosion. In this study, the relationships between precipitations of different durations (disaggregation coefficients) and intensity-duration-frequency relations for different locations in the State of Rio de Janeiro were estimated. The erosion process was also evaluated in a Red-Yellow Argissolo in Seropédica - RJ under different intensities and duration of simulated rainfall with absence and presence of vegetal cover on the soil and water infiltration. In the study of extreme rains, the established annual maximum series ranged from 5 min to 240 min and the return period from 5 to 100 years. The average relation between rainfall with different durations associated with the return periods of 5 to 100 years varies from 0.40 ± 0.10 to 1.04 ± 0.02, with higher values in the southern Fluminense mesoregion. The relationships between precipitations of different durations obtained for the localities of Rio de Janeiro are higher than those observed in other regions of Brazil. The IDF relations have high variability between the studied locations and the highest coefficients k, a, b and c were found, respectively in the Metropolitan, Baixadas Litorâneas, Baixadas Litorâneas and Fluminense Center regions. In the field study, under simulated rainfall, the sediment yield varied from 1.89 ± 1.26 g m-2 to 4.02 ± 2.66 g m-2, respectively for the IPs 52.9 mm h-1 and 44.6 mm h-1. The runoff ranged from 16.9 ± 8.74 mm to 32.63 ± 10.67 mm, respectively in the IPs 75.0 mm h-1 and 52.9 mm h-1. The rainfall types did not change the sediment yield and the stable infiltration rate in soil covered by corn straw, however there were differences in the runoff. The inverse was verified in the condition of soil without vegetative cover on the surface.

MEMBROS DA BANCA:
Presidente - 1224578 - DANIEL FONSECA DE CARVALHO
Externo ao Programa - 2131822 - CONAN AYADE SALVADOR
Externo ao Programa - 2136627 - NIVALDO SCHULTZ
Externo à Instituição - GUILHERME KANGUSSU DONAGEMMA - EMBRAPA
Externo à Instituição - ELOI PANACHUKI