Terras caídas: Fluvial erosion or distinct phenomenon in the Amazon?

  • Iris Celeste Nascimento Bandeira
  • Amilcar Adamy
  • Elton Rodrigo Andretta
  • Raimundo Almir Costa da Conceição
  • Milena Marília Nogueira de Andrade
Original Article
  • 31 Downloads

Abstract

In the Amazon River Basin, as in other hydrographic regions of Brazil and the world, fluvial erosion processes occur because of rivers dynamics. However, the lateral erosion that occurs on banks of Amazonian rivers, called terras caídas, typically is associated with gravitational movements and is mainly related to large landslides that can damage structures or kill people who live along these riverbanks. To better understand the erosive processes that occur in rivers of northern Brazil, especially those located in the Amazon River Basin, this work aims to describe the terras caídas phenomenon and determine whether it is a distinct phenomenon of fluvial erosion processes. The investigation includes analysis of hydrometeorological data of the National Water Agency (ANA), information collected during field expeditions, and mapping of geological and hydrological risk areas in the states of Amazonas, Acre, Rondônia, Pará, and Amapá performed by the Geological Survey of Brazil—(CPRM) from 2011 to 2016. It is concluded that terras caídas is a distinct phenomenon in the Amazon rivers that is different from erosive processes in other Brazilian rivers, because it is associated not only with the lateral erosion, but also with mass movements of moderate and large extents, which cause landslips, undermining, creeps, and major landslides.

Keywords

Brazilian rivers Fallen soil Fluvial risk Riverbanks River erosion 

Notes

Acknowledgements

The authors would like to thank the Geological Survey of Brazil, for a field support and risk sectors information of the study area.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Iris Celeste Nascimento Bandeira
    • 1
  • Amilcar Adamy
    • 2
  • Elton Rodrigo Andretta
    • 3
  • Raimundo Almir Costa da Conceição
    • 1
  • Milena Marília Nogueira de Andrade
    • 4
  1. 1.Serviço Geológico do Brasil (CPRM)BelémBrazil
  2. 2.Serviço Geológico do Brasil (CPRM)Porto VelhoBrazil
  3. 3.Serviço Geológico do Brasil (CPRM)ManausBrazil
  4. 4.Universidade Federal Rural da AmazôniaBelémBrazil

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