As Características Hidrológicas do solo de Várzea e sua Vulnerabilidade ao Processo de Terras Caídas na Amazônia Central (BR)

Magalhães, Regiane Campos; Vieira, Antonio Fábio Sabbá Guimarães

doi:10.26848/rbgf.v10.6.p773-788

Cited by 1 publication

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“…Particularities from large rivers system are: extensive alluvial deposits susceptible to fluvial erosion, high precipitation index, fluvial hydrodynamics related to big and mega rivers (LATRUBESSE, 2008;ASHWORTH;LEWIN, 2012), and localised erosion as well as large soil displacements (slumps, creep and landslides) regionally known as Terras Caidas (BANDEIRA et al, 2018). Despite the existence of the studies on the fluvial erosional processes, their triggering factors and the risk faced by people who occupy the margins of the Amazon rivers, such as: Carvalho (2006), Passos;, Magalhães andVieira (2018), Bandeira et al (2018), Souza (2019), Silva;Andrade (2019) and on the sectorization of the risk from 2012 to 2019 conducted by Geological Survey of Brazil -CPRM (2020), there are no studies on risk assessment mapping taking into consideration Amazon geological, hydrological and socioeconomic features in the fluvial erosion processes, in their analysis. In this context, the study aim to analyse riverbank risk erosion in three areas in the Amazon.…”

Section: Introductionmentioning

confidence: 99%

Fluvial Erosion Risk Analysis: An Amazon Study Case

Bandeira

Conceição

Andrade

et al. 2021

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In the Amazon region, there are more than 26.000 people living in areas at risk of fluvial erosion processes. In addition to the large number of people impacted, studies have shown that the erosion patterns identified on the margins of mega rivers in the Amazon region are distinct due to the fact they are related the mass movement leading to great soil displacement known as ‘Terras Caidas’. In this context, this study aims to evaluate quantitatively the degrees of risk in areas subject to fluvial erosion in three communities: Itanduba, São Braz, and Fátima de Urucurituba. The methods include hazard attributes, as well as vulnerability aspects, through the Analytic Hierarchy Process (AHP). A multitemporal analysis were made to validated the marginal erosion at the studied areas. The results indicated a high risk of fluvial erosion on these areas. The local families lives under high and very high social vulnerability in conditions with little infrastructure and very close to the susceptible erosive riverbank. The riverbank is composed of poorly consolidated sediments, show instability indicators, and are usually associated to drainages with flow rates above 100.000m3/s. The results and methodology brings an important contribuition to territorial planning of the region.

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Section: Introductionmentioning

confidence: 99%