Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow
In deltas and estuaries throughout the world, a fluvial-to-tidal transition zone (FTTZ) exists where both the river discharge and the tidal motion drive the flow. It is unclear how dune characteristics are impacted by changes in tidal flow strength, and how this is reflected in the hydraulic roughness. To understand dune geometry and variability in the FTTZ and possible impacts on hydraulic roughness, we assess dune variability from multibeam bathymetric surveys, and we use a calibrated 2D hydrodynamic model (Delft3D-FM) of a sand-bedded lowland river (Fraser River, Canada). We focus on a period of low river discharge during which tidal impact is strong. We find that the fluvial-tidal to tidal regime change is not directly reflected in dune height, but local patterns of increasing and decreasing dune height are present. The fluvial-to-tidal regime change is reflected in dune shape, where dunes have lower leeside angles and are more symmetrical in the tidal regime. The calibrated model allows to estimate local patterns of dune heights using tidally averaged values of bed shear stress. However, the spatially variable dune morphology hampers local dune height estimation. Changes in dune shape do not significantly impact the reach-scale roughness, and estimated dune roughness using dune height and length is similar to the dune roughness inferred from model calibration. Hydraulic model performance with a calibrated, constant roughness is not improved by implementing dune-derived bed roughness. Instead, the data analysis revealed that large-scale river morphology may explain differences in model roughness and corresponding estimates from dune predictors.
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Format: | Article/Letter to editor biblioteca |
Language: | English |
Subjects: | dune height predictors, dune morphology, fluvial-to-tidal transition zone, hydraulic model, hydraulic roughness, leeside angle, |
Online Access: | https://research.wur.nl/en/publications/dune-geometry-and-the-associated-hydraulic-roughness-in-the-fluvi |
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dig-wur-nl-wurpubs-6268732024-10-02 de Lange, S. Bradley, R. Schrijvershof, R.A. Murphy, D. Waldschläger, K. Kostaschuk, R. Venditti, J.G. Hoitink, A.J.F. Article/Letter to editor Journal of Geophysical Research: Earth Surface 129 (2024) 2 ISSN: 2169-9003 Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow 2024 In deltas and estuaries throughout the world, a fluvial-to-tidal transition zone (FTTZ) exists where both the river discharge and the tidal motion drive the flow. It is unclear how dune characteristics are impacted by changes in tidal flow strength, and how this is reflected in the hydraulic roughness. To understand dune geometry and variability in the FTTZ and possible impacts on hydraulic roughness, we assess dune variability from multibeam bathymetric surveys, and we use a calibrated 2D hydrodynamic model (Delft3D-FM) of a sand-bedded lowland river (Fraser River, Canada). We focus on a period of low river discharge during which tidal impact is strong. We find that the fluvial-tidal to tidal regime change is not directly reflected in dune height, but local patterns of increasing and decreasing dune height are present. The fluvial-to-tidal regime change is reflected in dune shape, where dunes have lower leeside angles and are more symmetrical in the tidal regime. The calibrated model allows to estimate local patterns of dune heights using tidally averaged values of bed shear stress. However, the spatially variable dune morphology hampers local dune height estimation. Changes in dune shape do not significantly impact the reach-scale roughness, and estimated dune roughness using dune height and length is similar to the dune roughness inferred from model calibration. Hydraulic model performance with a calibrated, constant roughness is not improved by implementing dune-derived bed roughness. Instead, the data analysis revealed that large-scale river morphology may explain differences in model roughness and corresponding estimates from dune predictors. en application/pdf https://research.wur.nl/en/publications/dune-geometry-and-the-associated-hydraulic-roughness-in-the-fluvi 10.1029/2023JF007340 https://edepot.wur.nl/649648 dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research |
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dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle |
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dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle de Lange, S. Bradley, R. Schrijvershof, R.A. Murphy, D. Waldschläger, K. Kostaschuk, R. Venditti, J.G. Hoitink, A.J.F. Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
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In deltas and estuaries throughout the world, a fluvial-to-tidal transition zone (FTTZ) exists where both the river discharge and the tidal motion drive the flow. It is unclear how dune characteristics are impacted by changes in tidal flow strength, and how this is reflected in the hydraulic roughness. To understand dune geometry and variability in the FTTZ and possible impacts on hydraulic roughness, we assess dune variability from multibeam bathymetric surveys, and we use a calibrated 2D hydrodynamic model (Delft3D-FM) of a sand-bedded lowland river (Fraser River, Canada). We focus on a period of low river discharge during which tidal impact is strong. We find that the fluvial-tidal to tidal regime change is not directly reflected in dune height, but local patterns of increasing and decreasing dune height are present. The fluvial-to-tidal regime change is reflected in dune shape, where dunes have lower leeside angles and are more symmetrical in the tidal regime. The calibrated model allows to estimate local patterns of dune heights using tidally averaged values of bed shear stress. However, the spatially variable dune morphology hampers local dune height estimation. Changes in dune shape do not significantly impact the reach-scale roughness, and estimated dune roughness using dune height and length is similar to the dune roughness inferred from model calibration. Hydraulic model performance with a calibrated, constant roughness is not improved by implementing dune-derived bed roughness. Instead, the data analysis revealed that large-scale river morphology may explain differences in model roughness and corresponding estimates from dune predictors. |
format |
Article/Letter to editor |
topic_facet |
dune height predictors dune morphology fluvial-to-tidal transition zone hydraulic model hydraulic roughness leeside angle |
author |
de Lange, S. Bradley, R. Schrijvershof, R.A. Murphy, D. Waldschläger, K. Kostaschuk, R. Venditti, J.G. Hoitink, A.J.F. |
author_facet |
de Lange, S. Bradley, R. Schrijvershof, R.A. Murphy, D. Waldschläger, K. Kostaschuk, R. Venditti, J.G. Hoitink, A.J.F. |
author_sort |
de Lange, S. |
title |
Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
title_short |
Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
title_full |
Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
title_fullStr |
Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
title_full_unstemmed |
Dune Geometry and the Associated Hydraulic Roughness in the Fluvial to Tidal Transition Zone of the Fraser River at Low River Flow |
title_sort |
dune geometry and the associated hydraulic roughness in the fluvial to tidal transition zone of the fraser river at low river flow |
url |
https://research.wur.nl/en/publications/dune-geometry-and-the-associated-hydraulic-roughness-in-the-fluvi |
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