A physically-based bedload transport model developed for 3-D reach-scale cellular modelling

Hodge, Rebecca; Richards, Keith; Brasington, James

doi:10.1016/j.geomorph.2006.10.022

Cited by 23 publications

(16 citation statements)

References 43 publications

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“…Although the critical shear stress is commonly assumed to be one value for a given grain size, particle motion is not an absolute threshold because some finite amount of transport can occur for any given shear stress. Detailed topographic scans of channel and flume beds have recently become available (e.g., terrestrial LiDAR and laser scanners), which allow for the collection of highresolution topographic data in a very short time (Marion et al, 2003;Hodge et al, 2007;Heritage and Milan, 2009). The large variability in these measured values (for a given grain size) is associated with the following: (1) method and measurement technique used to define the threshold of motion, (2) use of reachaveraged parameters that do not account for the local mechanics of motion, (3) spatial variability in the particle arrangement (e.g., protrusion, friction angle, and particle interlocking), and (4) temporal and spatial variation in the flow turbulence that causes motion.…”

Section: Discussionmentioning

confidence: 99%

9.7 The Initiation of Sediment Motion and Formation of Armor Layers

Yager

Schott

2013

Treatise on Geomorphology

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Section: Discussionmentioning

confidence: 99%

9.7 The Initiation of Sediment Motion and Formation of Armor Layers

Yager

Schott

2013

Treatise on Geomorphology

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“…The use of cellular models, especially in present or past braided river channel studies, has increased in recent years Doeschl-Wilson and Ashmore, 2005;Doeschl et al, 2006;Hodge et al, 2007;Murray and Paola, 1994;Nicholas et al, 2006;Sambrook Smith et al, 2006). However, many of these are simulated with theoretical channel conditions or flume experiments, and without conventional Lotsari et al 489 sediment transport equations to determine erosion and deposition that alter the channel form .…”

Section: Sediment Transport and Vertical Channel Evolutionmentioning

confidence: 99%

Prospects and challenges of simulating river channel response to future climate change

Lotsari

Thorndycraft

Alho

2015

Progress in Physical Geography: Earth and Environment

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Due to the predicted impacts of future climate on hydrology, morphological changes to river channels are expected. Quantifying the magnitudes and rates of future channel change is important for sustainable river channel management. To date, reviews of simulation approaches for investigating river channels and the modelling of environmental change impacts on channel form and process have focused on contemporary process or palaeo perspectives. Hence, herein we review numerical modelling approaches available for reach-scale simulation of future river channels and the predicted in-channel hydro-and morphodynamic changes modelled. We found that despite their widespread availability, hydrodynamic, morphodynamic and cellular models have yet to be used routinely in future in-channel simulations, with cellular models in particular under-represented. Our review shows that predictions of within-channel changes vary greatly between hydro-climatic regions and under contrasting climate change scenarios, mainly due to varying input discharge scenarios; however, increased sediment transport and flood risk are usually predicted. Key challenges in simulating future channel change include representations of external forcing conditions, adequate temporal and spatial scales, transport equations, changing channel materials and lateral erosion; calibration and validation; simulation chains with multiple models; and identification of feedback systems and nonlinearity. Nevertheless, despite these challenges, models with increasing complexity have recently been developed and so there is increasing potential in their application. One-dimensional hydro-and morphodynamic simulations, and cellular models, can be modified to reflect the requirements of future representations, such as grain size properties, whilst there is also now an increasing capability to include a greater quantity of external forcing conditions. Some studies, however, have demonstrated the need to develop twodimensional models for application in centennial-scale studies. We recommend that a wider range of Downloaded from scenarios and the combined effects of multiple external forcing factors should be included, whilst studies are also needed from more hydrologically diverse reaches.

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“…At timescales shorter than hundreds of thousands of years, tectonics are not usually included in landscape evolution models. As a result, (nearly) mechanistic models are used only at short timescales and for small study areas -for instance, to study evolution of reaches of large-boulder rivers (Hodge et al, 2007). In the conceptual model phase, decisions are made about the equations that describe each process in the model.…”

Section: Landscape Evolution Modelsmentioning

confidence: 99%