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• W4291710771 abstract "The Paraná River is one of the world's largest fluvial systems due to its discharge. During the last 30 years, water discharge has averaged 18,389 m3 s−1 downstream of the Paraguay-Paraná confluence, where its most important tributaries, the Paraguay and the upper Paraná rivers contribute 22% and 78% of its total discharge, respectively. However, the sedimentological dynamics of this system behaves peculiarly due to the influence of the Bermejo River, a tributary of the Paraguay River. Even though the contribution of the Bermejo River discharge represents only 2% of the Paraná River discharge, its input of suspended sediments is significant due to the erosive processes in the upper Bermejo basin. Most earlier studies have primarily focused on the contributions and dynamics of the wash load (silt and clay) from the Bermejo River through the Paraguay River to the Paraná River, and neglected the relevance of fine and very fine sands (coarser than 63 μm). These sediment fractions play a key role in bed sediment composition, roughness, and bed forms, ultimately modifying the flow resistance and the morphodynamic processes, among other environmental and biological parameters. This study seeks to quantify the suspended sediment contribution of the main tributaries of the middle Paraná River during the last three decades. In particular, water discharge, sediment transport and grain size data measured at gage stations located at the Paraguay River upper reach, the Bermejo River, and the upper and middle reaches of the Paraná River are analyzed. Focus is placed on the coarse suspended sediment fraction. Additionally, the authors collected sediment samples at different river cross-sections and water discharges. The temporal analysis revealed the dynamic behavior of the sediments along the system. The results show different behaviors of the wash load and suspended sand transport provided by the Bermejo River. Along the middle Paraná reach, results suggest a significant suspended coarse fraction deposition during the highest sediment input period. Bed sediments, in turn, are re-suspended during the months with low contributions from the Bermejo and/or during the high water levels stages of the Paraná. This sediment dynamics produces a complex pattern of coarse sediment transport in the Paraná River at its middle reach, also modifying the sedimentological characteristics of the river bed." @default.
• W4291710771 created "2022-08-16" @default.
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• W4291710771 date "2022-11-01" @default.
• W4291710771 modified "2023-10-18" @default.
• W4291710771 title "Sources and temporal dynamics of suspended sediment transport along the middle Paraná River" @default.
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• W4291710771 doi "https://doi.org/10.1016/j.jsames.2022.103968" @default.
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