Banca de DEFESA: REDY ROCHA DE MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : REDY ROCHA DE MEDEIROS
DATE: 07/10/2022
TIME: 16:00
LOCAL: https://meet.google.com/ohf-emhc-vwp
TITLE:

ANALYSIS OF AREAS SUSCEPTIBLE TO FLOODING IN THE URBAN SPACE OF CAICÓ-RN FROM MODELING TECHNIQUES IN A GIS ENVIRONMENT

KEY WORDS:

Susceptibility to flooding; Surface Runoff; SCS-CN Method.

PAGES: 81
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SUMMARY:

The present work aimed to perform the analysis of areas susceptible to flooding in the urban space of Caicó/RN from modeling techniques in GIS environment, seeking to relate the physical characteristics of the relief with the production of surface flow of the urban nucleus of the said area, through different techniques of geoprocessing and remote sensing, in order to identify flood susceptibility areas. Initially, the urban river system was characterized, making use of morphometric calculations, having as database the EAM derived from the SRTM mission of 30 m of NASADEM spatial resolution, which allowed the identification of the drainage pattern present in this area, which was classified as dendritic; based on strahler's classification (1962), being verified the presence of 53 first order rivers, 9 second order rivers, 1 fifth order rivers, 1 sixth order and 1 seventh order; 60 urban drainage basins were identified that presented compactness coefficient with classes close to the unit, corresponding to values between 1.15 and 1.67, morphometric ratio of the compactness coefficient (Kc), showing that in its natural conditions, the environment has drainage basins with high susceptibility to floods. For soil use analysis, supervised classification procedures of image and screen vectorization were performed, using scenes from the CBERS 4A satellite, captured by means of the WPM sensor, which has 8 meters of spatial resolution in multispectral cameras and 2 meters of spatial resolution in the panchromatic band, the classes of soil use and the measurement of these,  which in turn were defined as: Dense vegetation (12%), Thin vegetation and pasture (55%), Buildings (13%), Streets (3%), Water bodies (4%) and Exposed soils and rocky outcrops (13%). To estimate the surface runoff, the SCS-CN method was used, which made it possible to observe the presence of Lithic Neosols representing 58% of the area and the Chromic Luvisols occupying 42% of the area, both types of soils belong to the hydrological group D, according to the classification proposed by Sartori et al. (2005), this method also allowed estimating the average surface flow of each neighborhood of the city of Caicó, for different scenario of rainfall events and antecedent humidity conditions, where we considered an event of 107 mm (scenario I), a 56 mm event (scenario II) and a 29 mm event (scenario III). For the modeling of flood areas considering the physical characteristics of the relief, simulations were performed through routine execution in GIS environment in QGIS software, through the library “simlib”, do GRASS, the results of the final processing of this model, refers to raster maps that express the areas of flooding by means of pixels with values referring to water discharge, given in m³/s; among the neighborhoods with the highest rates of water discharges are: Paraíba, João XXIII, Walfredo Gurgel e Barra Nova.

COMMITTEE MEMBERS:
Presidente - 1112649 - JOSE YURE GOMES DOS SANTOS
Interno - ***.810.044-** - EDUARDO RODRIGUES VIANA DE LIMA - UFPB
Externo à Instituição - VICTOR HUGO RABELO COELHO - UFPB