masterThesis
Mapeamento de perigo de inundação incorporando o indicador tempo
Fecha
2019-07-30Registro en:
ALMEIDA, Rosa Ticiane de Oliveira. Mapeamento de perigo de inundação incorporando o indicador tempo. 2019. 47f. Dissertação (Mestrado em Engenharia Sanitária e Ambiental) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Almeida, Rosa Ticiane de Oliveira
Resumen
Unplanned urbanization and the consequent river banks undue occupation have caused
material, environmental and socio-economic damage to society due to floods. Therefore, to
predict with confidence the hydrological system behavior and the impacts of each flood event
on the anthropic activities is important to minimize these damages. To do this, a flood hazard
mapping can be done. The works that involve the topic usually use frequency, depth and
speed as main indicators. However, the flood duration is also a relevant parameter, because
long duration floods can cause soil erosion, water pollution and agricultural crops loss. Thus,
the objective of this research is to do, using as study site the low course of the Piranhas-Açu
River, a flood hazard mapping that considers beyond the usual criteria, the time of
permanence of water. For this, was done the river hydraulic modeling with the HEC-RAS
software, that provided velocity, depth and duration flood maps for 5, 10, 20, 50 and 100
years return period. From the hazard map for each return period the hazard map of the region
was obtained, based on the frequency-weighted average. The indicators hazard maps for each
return period were useful, and it was possible to verify the influence of each indicator on the
flooding hazard. However, the methodology for generating the global map decreased the
flooding hazard, causing the map showing low hazard. The results indicate that the floods
reach high depths, that the water flows slowly, resulting in high duration time flood.