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| Created: | Oct 22, 2024 at 8:37 p.m. | |
| Last updated: | Oct 28, 2024 at 7:52 p.m. | |
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| Content types: | Single File Content |
| Sharing Status: | Public |
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Abstract
Riverbed topography plays a crucial role in shaping hyporheic zone (HZ) processes, regulating the exchange of water, nutrients, and solutes between surface and groundwater systems. Despite its importance, the impact of spatial variations in riverbed topography on HZ processes remains poorly understood. This study investigated the relationship between geomorphic attributes of riverbed profile (riverbed slope, slope curvature, and pool-riffle sequence amplitude and wavelength) and HZ processes using two-dimensional (2D) computational models of reach-scale river-groundwater interactions. Simulations revealed that riverbed slope curvature and pool-riffle sequence attributes directly control the spatial development of HZ flow cells, while regional riverbed slope influences penetration intensity, dilution index, and mixing within the HZ. Specifically, riverbed slope curvature is critical for developing intermediate-scale HZ flow cells, and pool-riffle sequence attributes strongly control flushing intensity variability across the HZ depth. The wavelength of pool-riffle sequences dominates down- and up-welling fluxes, including residence time, while regional riverbed slope impacts penetration intensity, dilution index, and mixing. Steeper riverbed slopes generate higher heterogeneity in HZ flow paths, leading to increased mean residence times and solute retention. This study highlights the importance of geomorphic attributes of riverbed profile, particularly spatial variation in riverbed slope, for understanding river ecosystem dynamics and biogeochemical nutrient cycling.
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| Name | Organization | Address | Phone | Author Identifiers |
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| Department of Earth Sciences | Kent State University | Kent, Ohio |
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