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Sediment flows in South America supported by daily hydrologic-hydrodynamic modeling
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  • Hugo de Oliveira Fagundes,
  • Fernando Mainardi Fan,
  • Rodrigo Cauduro Dias de Paiva,
  • Vinícius Alencar Siqueira,
  • Diogo Costa Buarque,
  • Luísa Weizenmann Kornowski,
  • Leonardo Laipelt,
  • Walter Collischonn
Hugo de Oliveira Fagundes
Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Institute of Hydraulic Research, Federal University of Rio Grande do Sul

Corresponding Author:[email protected]

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Fernando Mainardi Fan
Institute of Hydraulic Research, Institute of Hydraulic Research
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Rodrigo Cauduro Dias de Paiva
Institute of Hydraulic Research, Institute of Hydraulic Research
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Vinícius Alencar Siqueira
Institute of Hydraulic Research, Institute of Hydraulic Research
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Diogo Costa Buarque
Department of Environmental Engineering, Department of Environmental Engineering
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Luísa Weizenmann Kornowski
Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Institute of Hydraulic Research, Federal University of Rio Grande do Sul
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Leonardo Laipelt
Institute of Hydraulic Research, Institute of Hydraulic Research
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Walter Collischonn
Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Institute of Hydraulic Research, Federal University of Rio Grande do Sul
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Abstract

Suspended sediments (SS) contribute to the maintenance of several ecosystems. However, intense soil erosion can lead to environmental, social, and economic impacts. South America (SA) has very high erosion and sediment transport rates. Here we present a detailed description of the spatio-temporal dynamics of natural SS flows in SA using the continental sediment model MGB-SED AS. We evaluate the model with daily in-situ data from 595 stations, information from regional studies and a global model. The model performance analysis showed that, in general, there was a better agreement between simulated and observed data than with the information found in regional studies and of the global model. The use of the hydrodynamic propagation method has allowed a better representation of sediment flows in rivers and floodplains. Based in the calibrated model results, SA delivers 1.00×109 t/year of SS to the oceans, in which the Amazon (4.36×108 t/year), Orinoco (1.37×108 t/year), La Plata (1.11×108 t/year) and Magdalena (3.26×107) rivers are the main suppliers. The floodplains play an essential role, retaining about 12% (2.40×108 t/year) of the SS loads reaching the rivers. In this study, datasets related to SS flows in SA were generated and can be used to support other large-scale researches or policymakers and stakeholders for adequate management of continental land use.
Feb 2021Published in Water Resources Research volume 57 issue 2. 10.1029/2020WR027884