Skip to main content

Research Repository

Advanced Search

Outputs (26)

Improving predictions of critical shear stress in gravel bed rivers: Identifying the onset of sediment transport and quantifying sediment structure (2024)
Journal Article
Hodge, R. A., Voepel, H. E., Yager, E. M., Leyland, J., Johnson, J. P. L., Sear, D. A., & Ahmed, S. (2024). Improving predictions of critical shear stress in gravel bed rivers: Identifying the onset of sediment transport and quantifying sediment structure. Earth Surface Processes and Landforms, https://doi.org/10.1002/esp.5842

Understanding when gravel moves in river beds is essential for a range of different applications but is still surprisingly hard to predict. Here we consider how our ability to predict critical shear stress (τ c ) is being improved by recent advances... Read More about Improving predictions of critical shear stress in gravel bed rivers: Identifying the onset of sediment transport and quantifying sediment structure.

Pro+: Automated protrusion and critical shear stress estimates from 3D point clouds of gravel beds (2024)
Journal Article
Yager, E. M., Shim, J., Hodge, R., Monsalve, A., Tonina, D., Johnson, J. P. L., & Telfer, L. (2024). Pro+: Automated protrusion and critical shear stress estimates from 3D point clouds of gravel beds. Earth Surface Processes and Landforms, https://doi.org/10.1002/esp.5822

The dimensionless critical shear stress (τ*c) needed for the onset of sediment motion is important for a range of studies from river restoration projects to landscape evolution calculations. Many studies simply assume a τ*c value within the large ran... Read More about Pro+: Automated protrusion and critical shear stress estimates from 3D point clouds of gravel beds.

The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 1. Pivot angles and surface roughness (2022)
Journal Article
Buechel, M. E., Hodge, R. A., & Kenmare, S. (2022). The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 1. Pivot angles and surface roughness. Earth Surface Processes and Landforms, 47(14), 3361-3375. https://doi.org/10.1002/esp.5463

Sediment entrainment in bedrock rivers is a key process for river incision and landscape evolution. Bedrock riverbeds are typically comprised of both exposed bedrock and alluvial patches, meaning grains can be entrained from positions on both surface... Read More about The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 1. Pivot angles and surface roughness.

The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 2. Modelling critical shear stress (2022)
Journal Article
Hodge, R., & Buechel, M. (2022). The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 2. Modelling critical shear stress. Earth Surface Processes and Landforms, 47(14), 3348-3360. https://doi.org/10.1002/esp.5462

The critical shear stress (τc) at which grains are entrained on a bedrock surface is important for determining how bedrock rivers evolve through changes in sediment cover and bedrock erosion. The difference in τc for grains on bedrock and alluvial su... Read More about The influence of bedrock river morphology and alluvial cover on gravel entrainment: Part 2. Modelling critical shear stress.

The Influence of In‐Channel Obstacles on River Sound (2022)
Journal Article
Osborne, W. A., Hodge, R. A., Love, G. D., Hawkin, P., & Hawkin, R. E. (2022). The Influence of In‐Channel Obstacles on River Sound. Water Resources Research, 58(4), Article e2021WR031567. https://doi.org/10.1029/2021wr031567

The sound of a river can change from a babbling brook to a thunderous torrent, and we have previously shown that there is the potential to predict river stage from the river's sub-aerial sound. Here, we examined how alterations in channel configurati... Read More about The Influence of In‐Channel Obstacles on River Sound.

Babbling brook to thunderous torrent: Using sound to monitor river stage (2021)
Journal Article
Osborne, W. A., Hodge, R. A., Love, G. D., Hawkin, P., & Hawkin, R. E. (2021). Babbling brook to thunderous torrent: Using sound to monitor river stage. Earth Surface Processes and Landforms, 46(13), 2656-2670. https://doi.org/10.1002/esp.5199

The passive, ambient sound above the water from a river has previously untapped potential for determining flow characteristics such as stage. Measuring sub-aerial sound could provide a new, efficient way to continuously monitor river stage, without t... Read More about Babbling brook to thunderous torrent: Using sound to monitor river stage.

Inertial drag and lift forces for coarse grains on rough alluvial beds measured using in-grain accelerometers (2020)
Journal Article
Maniatis, G., Hoey, T., Hodge, R., Rickenmann, D., & Badoux, A. (2020). Inertial drag and lift forces for coarse grains on rough alluvial beds measured using in-grain accelerometers. Earth Surface Dynamics, 8, 1067-1099. https://doi.org/10.5194/esurf-8-1067-2020

Quantifying the force regime that controls the movement of a single grain during fluvial transport has historically proven to be difficult. Inertial micro-electromechanical system (MEMS) sensors (sensor assemblies that mainly comprise micro-accelerom... Read More about Inertial drag and lift forces for coarse grains on rough alluvial beds measured using in-grain accelerometers.

X-ray computed tomography reveals that grain protrusion controls critical shear stress for entrainment in fluvial gravels (2019)
Journal Article
Hodge, R., Voepel, H., Leyland, J., Sear, D., & Ahmed, S. (2020). X-ray computed tomography reveals that grain protrusion controls critical shear stress for entrainment in fluvial gravels. Geology, 48(2), 149-153. https://doi.org/10.1130/g46883.1

The critical shear stress (τc) for grain entrainment is a poorly constrained control on bedload transport rates in rivers. Direct calculations of τc have been hindered by the inability to measure the geometry of in situ grains; i.e., the shape and lo... Read More about X-ray computed tomography reveals that grain protrusion controls critical shear stress for entrainment in fluvial gravels.

Development of a vector-based 3D grain entrainment model with application to X-ray computed tomography (XCT) scanned riverbed sediment (2019)
Journal Article
Voepel, H., Leyland, J., Hodge, R., Ahmed, S., & Sear, D. (2019). Development of a vector-based 3D grain entrainment model with application to X-ray computed tomography (XCT) scanned riverbed sediment. Earth Surface Processes and Landforms, 44(15), 3057-3077. https://doi.org/10.1002/esp.4608

Sediment transport equations typically produce transport rates that are biased by orders of magnitude. A causal component of this inaccuracy is the inability to represent complex grain‐scale interactions controlling entrainment. Grain‐scale incipient... Read More about Development of a vector-based 3D grain entrainment model with application to X-ray computed tomography (XCT) scanned riverbed sediment.