Model:PermafrostBankErosionModel: Difference between revisions
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Created page with "{{Model identity |Model type=Single }} {{Start models incorporated}} {{End a table}} {{Model identity2 |ModelDomain=Terrestrial, Hydrology |Spatial dimensions=2D |Spatialscale=Reach-Scale |One-line model description=The PermafrostBankErosionModel is a model simulating thermal–mechanical riverbank erosion in permafrost environments. |Extended model description=The PermafrostBankErosionModel is a Python-based simulation module for modeling riverbank erosion in permafros..." |
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{{Model identity | {{Model identity | ||
|Model type= | |Model also known as=Permafrost Bank Erosion Model | ||
|Model type=Tool | |||
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{{Start models incorporated}} | {{Start models incorporated}} | ||
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|Spatialscale=Reach-Scale | |Spatialscale=Reach-Scale | ||
|One-line model description=The PermafrostBankErosionModel is a model simulating thermal–mechanical riverbank erosion in permafrost environments. | |One-line model description=The PermafrostBankErosionModel is a model simulating thermal–mechanical riverbank erosion in permafrost environments. | ||
|Extended model description=The PermafrostBankErosionModel is a Python-based simulation module for modeling | |Extended model description=The PermafrostBankErosionModel is a Python-based simulation module for modeling bank erosion in permafrost rivers, where thermal and mechanical processes interact seasonally. The model simulates river bank ablation and collapse under fluvial and thermal forcing. | ||
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{{Start model keyword table}} | {{Start model keyword table}} | ||
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{{Model keywords | {{Model keywords | ||
|Model keywords= | |Model keywords=permafrost | ||
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{{Model keywords | |||
|Model keywords=ablation | |||
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{{Model keywords | |||
|Model keywords=collapse | |||
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{{End a table}} | {{End a table}} | ||
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|Program license type=GPL v3 | |Program license type=GPL v3 | ||
|Memory requirements=-- | |Memory requirements=-- | ||
|Typical run time= | |Typical run time=2 minutes | ||
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{{Input - Output description | {{Input - Output description | ||
|Describe input parameters= | |Describe input parameters=The model requires daily mean river water discharge, meteorological data, channel geometry, and thermal and mechanical characteristics of permafrost and river water. | ||
|Input format=ASCII | |Input format=ASCII | ||
|Describe output parameters= | |Describe output parameters=Bank profile and simulated erosion rates | ||
|Output format=ASCII | |Output format=ASCII | ||
|Pre-processing software needed?=No | |Pre-processing software needed?=No | ||
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{{Process description model | {{Process description model | ||
|Describe processes represented by the model=-- | |Describe processes represented by the model=This model simulates how flowing river water thaws interstitial pore ice in permafrost soils exposed on banks. This process - ablation - frees fine sediment that is otherwise cemented by ice, allowing for its entrainment and downstream transport. The model also simulates the episodic collapse of upper bank overhanging blocks that are undercut by ablation. This model is applicable to banks of permafrost rivers, but can be adapted to other settings. | ||
|Describe key physical parameters and equations=- | |Describe key physical parameters and equations=The model simulates ablation based on a fluvial heat transfer that is inhibited by latent heat in the bank. | ||
|Describe length scale and resolution constraints=- | The fluvial heat transfer coefficient depends on flow shear velocity and thermal properties of river water, including temperature. Flow shear velocity is modeled as a function of river water depth and roughness of gravel on bank toes. The heat required to melt interstitial pore ice is based on thermal properties of bank material; these include permafrost volumetric ice content and surface temperature, ice melting temperature, heat capacity, density, and latent heat in ice. this is based on the work by Costard et al., (2003) and others. | ||
|Describe time scale and resolution constraints=-- | |||
|Describe any numerical limitations and issues=- | The model simulates collapse by removing overhanging bank blocks rom the bank profile when a torque-based threshold is exceeded. The model tracks bank morphology and checks is the threshold is reached at each timestep. For this component, parameters include permafrost tensile strength and density and the distance between troughs in the floodplain. This is based on the model by Barnhart et al. (2013). | ||
|Describe length scale and resolution constraints=The bank erosion model works best when the vertical spacing on the bank profile is on the order of centimeters for a 1-meter bank profile. | |||
|Describe time scale and resolution constraints=The water temperature model is limited to a 3-hour timestep when using daily mean discharge data and meteorological data with 15-minute resolution. If the bank erosion model is run with constant water temperature, then timesteps can be larger or smaller. To allow for realistic geometry of overhanging blocks, the model should be run with hourly to daily timesteps. | |||
|Describe any numerical limitations and issues=This model is limited to ice-rich permafrost exposures, where soil is at least 40% ice by volume and inorganic particles tend to be finer than sand. | |||
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{{Model testing | {{Model testing | ||
Latest revision as of 18:24, 17 November 2025
PermafrostBankErosionModel
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Introduction
History
References
| Featured publication(s) | Year | Model described | Type of Reference | Citations |
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| PermafrostBankErosionModel |
Model application | 0 | ||
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