On the Morphodynamics of a Wide Class of Large‐Scale Meandering Rivers: Insights Gained by Coupling LES With Sediment‐Dynamics

Khosronejad, Ali; Limaye, Ajay B.; Zhang, Zexia; Kang, Seokkoo; Yang, Xiaolei; Sotiropoulos, Fotis

doi:10.1029/2022MS003257

Title: On the Morphodynamics of a Wide Class of Large‐Scale Meandering Rivers: Insights Gained by Coupling LES With Sediment‐Dynamics

Journal Article · Wed Mar 01 00:00:00 EST 2023 · Journal of Advances in Modeling Earth Systems

DOI:https://doi.org/10.1029/2022MS003257· OSTI ID:1959244

^[1]; Limaye, Ajay B. ^[2];

^[1];

^[3];

^[4]; Sotiropoulos, Fotis ^[5]

Civil Engineering Department Stony Brook University Stony Brook NY USA
Department of Environmental Sciences University of Virginia Charlottesville VA USA
Department of Civil and Environmental Engineering Hanyang University Seoul South Korea
State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing China
Department of Mechanical and Nuclear Engineering Virginia Commonwealth University Richmond VA USA

Abstract In meandering rivers, interactions between flow, sediment transport, and bed topography affect diverse processes, including bedform development and channel migration. Predicting how these interactions affect the spatial patterns and magnitudes of bed deformation in meandering rivers is essential for various river engineering and geoscience problems. Computational fluid dynamics simulations can predict river morphodynamics at fine temporal and spatial scales but have traditionally been challenged by the large scale of natural rivers. We conducted coupled large‐eddy simulation and bed morphodynamics simulations to create a unique database of hydro‐morphodynamic data sets for 42 meandering rivers with a variety of planform shapes and large‐scale geometrical features that mimic natural meanders. For each simulated river, the database includes (a) bed morphology, (b) three‐dimensional mean velocity field, and (c) bed shear stress distribution under bankfull flow conditions. The calculated morphodynamics results at dynamic equilibrium revealed the formation of scour and deposition patterns near the outer and inner banks, respectively, while the location of point bars and scour regions around the apexes of the meander bends is found to vary as a function of the radius of curvature of the bends to the width ratio. A new mechanism is proposed that explains this seemingly paradoxical finding. The high‐fidelity simulation results generated in this work provide researchers and scientists with a rich numerical database for morphodynamics and bed shear stress distributions in large‐scale meandering rivers to enable systematic investigation of the underlying phenomena and support a range of river engineering applications.

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Research Organization:: Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office; National Science Foundation Hydrology and Geomorphology and Land-use Dynamics Program

Grant/Contract Number:: EE0009450; EAR-0120914; EAR-1823530

OSTI ID:: 1959244

Alternate ID(s):: OSTI ID: 1959248; OSTI ID: 1960221

Journal Information:: Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Vol. 15 Journal Issue: 3; ISSN 1942-2466

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Title: On the Morphodynamics of a Wide Class of Large‐Scale Meandering Rivers: Insights Gained by Coupling LES With Sediment‐Dynamics

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