Loading...
Publication
A Influência do Coeficiente de Rugosidade nos Fenómenos de Cheias – Bacia Hidrográfica da Ribeira de Machico, Ilha da Madeira, Portugal
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 958.29 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Acentuados pelas alterações climáticas regionais e globais, os fenómenos das cheias são eventos cada vez mais
recorrentes e devastadores. Casos extremos como os que ocorreram em 2010 e 2013 na Ilha da Madeira corroboram com este
indicativo, sendo as regiões mais afetadas as que possuíam maior índice urbanístico e maior impermeabilização do solo, como
o concelho de Machico. Portanto, com base no histórico recente de cheias no concelho de Machico e o auxílio de ferramentas
de georreferenciação como o ArcGIS, procedeu-se à análise geomorfológica e hidrológica da bacia hidrográfica da ribeira de
Machico, de forma a verificar o caudal expectável para um período de recorrência de 100 anos, de acordo com a distribuição
probabilística de Gumbel. Posteriormente analisou-se a capacidade de escoamento da foz por meio da equação de Manning Strickler, onde será avaliado o coeficiente de rugosidade mínimo necessário para permitir o escoamento do caudal de ponta
de cheia expectável. Por fim, os resultados sugerem que a foz não possui a capacidade de escoar o caudal precipitado,
necessitando de alterações no coeficiente de rugosidade do leito.
Flood phenomena, intensified by regional and global climate change, are increasingly recurrent and devastating events. Extreme cases such as those in 2010 and 2013 on the island of Madeira corroborate this indicator. The regions most affected are those with the highest urban index and the most significant soil waterproofing, such as Machico. Therefore, based on the recent history of floods in the city of Machico and the aid of georeferencing tools such as ArcGIS, the geomorphological and hydrological analysis of the hydrographic basin of the Machico stream was carried out in order to verify the expected flow rate for a recurrence period of 100 years, through the Gumbel Probabilistic Distribution. Subsequently, the river mouth's flow capacity was analyzed using the Manning-Strickler equation, where the minimum roughness coefficient necessary to allow the flow of the expected high peak flow will be evaluated. Finally, the results suggest that the river’s mouth does not have the capacity to drain the precipitated flow, requiring changes in the bed roughness coefficient.
Flood phenomena, intensified by regional and global climate change, are increasingly recurrent and devastating events. Extreme cases such as those in 2010 and 2013 on the island of Madeira corroborate this indicator. The regions most affected are those with the highest urban index and the most significant soil waterproofing, such as Machico. Therefore, based on the recent history of floods in the city of Machico and the aid of georeferencing tools such as ArcGIS, the geomorphological and hydrological analysis of the hydrographic basin of the Machico stream was carried out in order to verify the expected flow rate for a recurrence period of 100 years, through the Gumbel Probabilistic Distribution. Subsequently, the river mouth's flow capacity was analyzed using the Manning-Strickler equation, where the minimum roughness coefficient necessary to allow the flow of the expected high peak flow will be evaluated. Finally, the results suggest that the river’s mouth does not have the capacity to drain the precipitated flow, requiring changes in the bed roughness coefficient.
Description
Keywords
Análise de cheias Coeficiente de rugosidade Hidráulica urbana Mitigação dos impactos urbanos Planejamento urbano Machico, Madeira (Portugal) Flood analysis Roughness coefficient Urban hydraulics Mitigation of urban impacts Urban planning . Faculdade de Ciências Exatas e da Engenharia
Citation
Lousada, S. A. N. (2023). A Influência do Coeficiente de Rugosidade nos Fenómenos de Cheias – Bacia Hidrográfica da Ribeira de Machico, Ilha da Madeira, Portugal. Revista Brasileira De Geomorfologia, 24(3). https://doi.org/10.20502/rbg.v24i3.2307
Publisher
União da Geomorfologia Brasileira