Feng D. Y., Tan Z. L., Pinel S., Xu D. H., Amaral J. H. F., Fassoni-Andrade A. C., Bonnet Marie-Paule, Bisht G. (2025). Drivers and impacts of sediment deposition in Amazonian floodplains. Nature Communications, 16 (1), p. 3148 [12 p.].
Titre du document
Drivers and impacts of sediment deposition in Amazonian floodplains
Feng D. Y., Tan Z. L., Pinel S., Xu D. H., Amaral J. H. F., Fassoni-Andrade A. C., Bonnet Marie-Paule, Bisht G.
Source
Nature Communications, 2025,
16 (1), p. 3148 [12 p.]
The Amazon River carries enormous amounts of sediment from the Andes mountains, much of which is deposited in its floodplains. However, accurate quantification of the sediment sink at fine spatiotemporal scales is still challenging. Here, we present a high-resolution hydrodynamic-sediment model to simulate sediment deposition in a representative Amazon/Solimões floodplain. The process is found to be jointly driven by inundation, suspended sediment concentration in the Amazon River, and floodplain hydrodynamics and only weakly correlated with inundation level. By upscaling the sediment deposition rate (1.33 +/- 0.24 kg m(-2) yr(-1)), we estimate the trapping of 77.3 +/- 13.9 Mt (or 6.1 +/- 1%) of the Amazon River sediment by the Amazon/Solim & otilde;es floodplains every year. Widespread deforestation would reduce the trapping efficiency of the floodplains over time, exacerbating downstream river aggradation. Additionally, we show that the deposition of sediment-associated organic carbon plays a minor role in fueling carbon dioxide and methane emissions in the Amazon.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Hydrologie [062]
;
Géologie et formations superficielles [064]
Description Géographique
AMAZONIE ; AMAZONE COURS D'EAU ; SOLIMOES COURS D'EAU
