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Article

Coupling Sediment Transport Dynamics with Sediment and Discharge Sources in a Glacial Andean Basin

by 1 and 2,3,*
1
Department of Ecosystems and Environments, Pontificia Universidad Católica de Chile, Macul, Santiago 7810000, Chile
2
Institute of Geography, Pontificia Universidad Católica de Chile, Macul, Santiago 7810000, Chile
3
School of Geography, University of Lincoln, Lincoln LN6 7TS, UK
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3452; https://doi.org/10.3390/w12123452
Received: 28 October 2020 / Revised: 29 November 2020 / Accepted: 7 December 2020 / Published: 9 December 2020
(This article belongs to the Special Issue Fluvial Processes and Denudation)
Suspended and bedload transport dynamics on rivers draining glacierized basins depend on complex processes of runoff generation together with the degree of sediment connectivity and coupling at the basin scale. This paper presents a recent dataset of sediment transport in the Estero Morales, a 27 km2 glacier-fed basin in Chile where suspended sediment concentration (SSC) and bedload (BL) fluxes have been continuously monitored during two ablation seasons (2014–2015 and 2015–1016). The relationship between discharge and SSC depends on the origin of runoff, which is higher during glacier melting, although the hysteresis index reveals that sediment sources are closer to the outlet during snowmelt. As for suspended sediment transport, bedload availability and yield depend on the origin of runoff. Bedload yield and bedload transport efficiency are higher during the glacier melting period in the first ablations season due to a high coupling to the proglacial area after the snowmelt period. Instead, on the second ablation seasons the peak of bedload yield and bedload transport efficiency occur in the snowmelt period, due to a better coupling of the lower part of the basin caused by a longer permanency of snow. Differences in volumes of transported sediments between the two seasons reveal contrasting mechanisms in the coupling dynamic of the sediment cascade, due to progressive changes of type and location of the main sources of runoff and sediments in this glacierized basin. The paper highlights the importance of studying these trends, as with retreating glaciers basins are likely producing less sediments after the “peak flow”, with long-term consequences on the ecology and geomorphology of rivers downstream. View Full-Text
Keywords: bedload; suspended sediment; sediment coupling; snowmelt; glacier melt; Andes bedload; suspended sediment; sediment coupling; snowmelt; glacier melt; Andes
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MDPI and ACS Style

Carrillo, R.; Mao, L. Coupling Sediment Transport Dynamics with Sediment and Discharge Sources in a Glacial Andean Basin. Water 2020, 12, 3452. https://doi.org/10.3390/w12123452

AMA Style

Carrillo R, Mao L. Coupling Sediment Transport Dynamics with Sediment and Discharge Sources in a Glacial Andean Basin. Water. 2020; 12(12):3452. https://doi.org/10.3390/w12123452

Chicago/Turabian Style

Carrillo, Ricardo, and Luca Mao. 2020. "Coupling Sediment Transport Dynamics with Sediment and Discharge Sources in a Glacial Andean Basin" Water 12, no. 12: 3452. https://doi.org/10.3390/w12123452

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