Model:Kirwan marsh model: Difference between revisions
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|Model type=Single | |Model type=Single | ||
|Categories=Coastal | |Categories=Coastal | ||
|One-line model description=Ecomorphoydamic model of marsh elevation and channel evolution | |One-line model description=Ecomorphoydamic model of marsh elevation and channel evolution | ||
|Extended model description=Spatially explicit model of the development and evolution of salt marshes, including vegetation influenced accretion and hydrodynamic determined channel erosion. | |Extended model description=Spatially explicit model of the development and evolution of salt marshes, including vegetation influenced accretion and hydrodynamic determined channel erosion. | ||
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{{Model technical information | {{Model technical information | ||
|Supported platforms=Linux | |Supported platforms=Linux | ||
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|Start year development=2003 | |Start year development=2003 | ||
|Does model development still take place?=Yes | |Does model development still take place?=Yes | ||
|Program license type=GPL v2 | |Program license type=GPL v2 | ||
|Memory requirements=-- | |Memory requirements=-- | ||
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{{Input - Output description | {{Input - Output description | ||
|Describe input parameters=Does not require any input data, but if desired, model can run from files describing sea level and/or the elevations of an existing marsh. | |Describe input parameters=Does not require any input data, but if desired, model can run from files describing sea level and/or the elevations of an existing marsh. | ||
|Input format=ASCII | |Input format=ASCII | ||
|Describe output parameters=Elevation, Biomass, Accretion Rate, Erosion Rate, and other characteristics of every cell in domain. Also outputs spatially averaged statistics. | |Describe output parameters=Elevation, Biomass, Accretion Rate, Erosion Rate, and other characteristics of every cell in domain. Also outputs spatially averaged statistics. | ||
|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=The model calculates changes in elevation and vegetation growth for a hypothetical salt marsh. In each cell, elevation change is calculated as the difference between accretion and erosion. Accretion rates are a function of inundation depth, vegetation growth, and suspended sediment concentration. Water routed according to Rinaldo et al. (1999) scheme. Erosion rates calculated according to excess sheer stress. Channels widen according to a diffusion-like routine where downslope transport is inversely proportional to vegetation. Vegetation grows according to Morris et al. (2002) where biomass is proportional to inundation depth up until an optimum depth. Episodic vegetation disturbance is simulated by removing vegetation from randomly selected cells (Kirwan et al., 2008). Another version of the model treats wave erosion in a simplistic manner (Kirwan and Murray, 2008). | |Describe processes represented by the model=The model calculates changes in elevation and vegetation growth for a hypothetical salt marsh. In each cell, elevation change is calculated as the difference between accretion and erosion. Accretion rates are a function of inundation depth, vegetation growth, and suspended sediment concentration. Water routed according to Rinaldo et al. (1999) scheme. Erosion rates calculated according to excess sheer stress. Channels widen according to a diffusion-like routine where downslope transport is inversely proportional to vegetation. Vegetation grows according to Morris et al. (2002) where biomass is proportional to inundation depth up until an optimum depth. Episodic vegetation disturbance is simulated by removing vegetation from randomly selected cells (Kirwan et al., 2008). Another version of the model treats wave erosion in a simplistic manner (Kirwan and Murray, 2008). | ||
|Describe key physical parameters and equations=Key parameters include the rate of sea level rise, suspended sediment concentration, tidal range (which controls vegetation distribution), critical shear stress for sediment erosion, and the period of time that erosion takes place during each tidal cycle. Parameters controlling the growth pattern of vegetation can easily be modified. | |Describe key physical parameters and equations=Key parameters include the rate of sea level rise, suspended sediment concentration, tidal range (which controls vegetation distribution), critical shear stress for sediment erosion, and the period of time that erosion takes place during each tidal cycle. Parameters controlling the growth pattern of vegetation can easily be modified. | ||
|Describe length scale and resolution constraints=Domain size is 3 km by 3 km, grid cell is 5 m by 5m. | |Describe length scale and resolution constraints=Domain size is 3 km by 3 km, grid cell is 5 m by 5m. | ||
|Describe time scale and resolution constraints=The model explicitly runs on an individual tidal cycle time step, which we scale up to 2 months. But, results most meaningful at timescales greater than a couple years. | |Describe time scale and resolution constraints=The model explicitly runs on an individual tidal cycle time step, which we scale up to 2 months. But, results most meaningful at timescales greater than a couple years. | ||
|Describe any numerical limitations and issues=-- | |Describe any numerical limitations and issues=-- | ||
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{{Model testing | {{Model testing | ||
|Describe available calibration data sets=Biomass productivity and marsh accretion rates from 1984-present, described in Morris et al. (2002). | |Describe available calibration data sets=Biomass productivity and marsh accretion rates from 1984-present, described in Morris et al. (2002). | ||
|Describe available test data sets=A couple high resolution Pb210 curves that span ~100 years are currently being constructed and used to test model. | |Describe available test data sets=A couple high resolution Pb210 curves that span ~100 years are currently being constructed and used to test model. | ||
|Describe ideal data for testing=Long term, high resolution (annual to couple years) datasets of marsh accretion. Similar time series of channel characteristics would be useful. | |Describe ideal data for testing=Long term, high resolution (annual to couple years) datasets of marsh accretion. Similar time series of channel characteristics would be useful. | ||
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{{Users groups model | {{Users groups model | ||
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|CCA component=No but possible | |CCA component=No but possible | ||
|IRF interface=No but possible | |IRF interface=No but possible | ||
|CMT component=Not yet | |||
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Revision as of 17:32, 23 June 2011
