TY - JOUR
T1 - The role of dunes in flow resistance in a large and a small river. The case of the Paraná and Tercero rivers, Argentina
AU - Latosinski, Francisco G.
AU - Amsler, Mario L.
AU - Vionnet, Carlos A.
AU - Heredia Ligorria, Ana I.
AU - Szupiany, Ricardo N.
AU - Diaz Lozada, José M.
AU - García, Carlos M.
AU - García, Marcelo H.
N1 - Funding Information:
The investigation was funded by the Faculty of Engineering and Water Sciences of the Universidad Nacional del Litoral (CAID 2016: “Bifurcations in the Paraná River system: hydro-sedimentological processes and implications in its morphodynamics” (in Spanish) and “Interdisciplinary evaluation of processes for the opening, maintenance and closure of secondary channels of the Paraná River” (in Spanish)). The authors gratefully appreciate the efforts of Cristian Vera and Santiago Cañete from the Faculty of Engineering and Water Sciences of the Universidad Nacional del Litoral who collaborated tirelessly in the Paraná River fieldworks. The authors also acknowledge the logistic support for conducting measurements in the Tercero River provided by the Provincial Administration of Water Resources (APRHi) of Córdoba administration. The support of the M.T. Geoffrey Yeh Chair in Civil Engineering at the University of Illinois at Urbana-Champaign is gratefully acknowledged. The authors are deeply grateful to two anonymous reviewers whose comments and suggestions undoubtedly improved the first draft of the manuscript.
Publisher Copyright:
© 2022 International Association for Hydro-Environment Engineering and Research.
PY - 2022
Y1 - 2022
N2 - The dynamics of sandy rivers is a complex phenomenon linking the interactions between dunes, flow and sediment transport. Despite an existing large amount of research, few comparative studies exist for rivers with major hydro-sedimentological differences. This work uses detailed dune measurements from the Paraná and Tercero rivers, Argentina. Significant differences were found in the representative roughness height scale, dune steepness, lee angles, velocity profiles and flow recirculation. It is found that whereas the hydraulic resistance for the Tercero River scales with the size of large dunes, the Paraná River needs to develop an intermediate roughness scale (the small superimposed dunes) to accommodate the required balance between gravity and friction. Suspended bed sediment increase is inversely related to the dune steepness and lee side angles as advanced by previous findings. The suspension number seems to be a paramount metric that helps explain differences regarding dune geometry within a wide range of flow conditions.
AB - The dynamics of sandy rivers is a complex phenomenon linking the interactions between dunes, flow and sediment transport. Despite an existing large amount of research, few comparative studies exist for rivers with major hydro-sedimentological differences. This work uses detailed dune measurements from the Paraná and Tercero rivers, Argentina. Significant differences were found in the representative roughness height scale, dune steepness, lee angles, velocity profiles and flow recirculation. It is found that whereas the hydraulic resistance for the Tercero River scales with the size of large dunes, the Paraná River needs to develop an intermediate roughness scale (the small superimposed dunes) to accommodate the required balance between gravity and friction. Suspended bed sediment increase is inversely related to the dune steepness and lee side angles as advanced by previous findings. The suspension number seems to be a paramount metric that helps explain differences regarding dune geometry within a wide range of flow conditions.
KW - Bedload
KW - Paraná and Tercero rivers
KW - field measurements
KW - flow resistance
KW - river dunes
KW - suspended bed sediments
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U2 - 10.1080/00221686.2021.2001588
DO - 10.1080/00221686.2021.2001588
M3 - Article
AN - SCOPUS:85122746427
SN - 0022-1686
VL - 60
SP - 389
EP - 407
JO - Journal of Hydraulic Research
JF - Journal of Hydraulic Research
IS - 3
ER -