Property:Describe key physical parameters
From CSDMS
This is a property of type Text.
Q
G
Too much to describe in only 500 characters! See: http://www.gsshawiki.com/wiki/index.php5?title=Main_Page +
S
C
Topographic analysis so no physical parameters as such. The main parameters fro the module are:
1) sigma: the uncertainty (in metres, or meters for you yanks), of the topographic data.
2) The target nodes: These are the number of nodes you wish to use in each subset of the channel. For details see associated documentation. This should vary between 60-140. The module partitions data and the number of partitions is a highly nonlinear function of the number of nodes so target node values of >150 will lead to compute times of many months - forever.
3) The minimum segment length: The shortest contiguous number of nodes the user is willing to consider for statistical analysis (in testing, 8-20 performed reasonably well). If you chose 2 you will be performing linear analysis on segments with 2 data points which is clearly nonsense.
4) Mean skip: See associated documentation, but the module uses a Monte Carlo sampling regime which skips nodes, analyses a subset of data, and then performs this skipping and analysis routine over a number of iterations. For SRTM and ASTER data this should be 1-2. For 10m data it can be 1-10, and for LiDAR data you could skip up to 100 nodes. Note that because of the iterative processes you will need to increase the number of iterations as you increase the skip value if you are to sample all of the data. +
G
Topographic analysis, vector topology +
C
Topographic slope-weighted multiple flow direction water routing. Stream power transport. +
E
Uses Komar or Egiazaroff formulations for calculating the Shield's critical shear stress of the ith size and jth density fraction of a heterogeneous size-density bed +
Uses Yalin and Karahan formulation for calculating the Shield's critical shear stress of the bed +
D
Water-driven diffusion equation for transport.
Erosion controlled by water flow and shear stress. Carbonate production function of water depth, wave energy, ecology. Complex tectonics are user-defined geometrical deformation. +
N
Wave equations, wave-averaged circulation equations and equations for bedload and suspended-load sediment transport. +
Y
Z
P
grain diameter
compressional frictional rigidity constant
bulk density of the sediment
compressional wave speed
bulk modulus of the individual sediment grains
bulk modulus of the pore fluid
porosity of the saturated sediment
density of the mineral grains +
W
hundereds. +
S
hydraulic_conductivity : The soil effective hydraulic conductivity.
soil_bulk_density : The dry bulk density of the soil.
rock_density : The density of the soil constituent material (i.e., lacking porosity).
initial_soil_moisture_content : The fraction of the initial pore space filled with water.
soil_type : A soil type to automatically set soil_pore_size_distribution_index and soil_bubbling_pressure, using mean values from Rawls et al., 1992.
volume_fraction_coarse_fragments : The fraction of the soil made up of rocky fragments with very little porosity, with diameter > 2 mm.
coarse_sed_flag : If this flag is set to true, the fraction of coarse material in the soil column with be used as a correction for phi, the porosity factor.
surface_water_minimum_depth : A minimum water depth to stabilize the solutions for surface flood modelling. Leave as the default in most normal use cases.
soil_pore_size_distribution_index : An index describing the distribution of pore sizes in the soil, and controlling effective hydraulic conductivity at varying water contents, following Brooks and Corey (1964). Can be set by soil_type. Typically denoted "lambda".
soil_bubbling_pressure : The bubbling capillary pressure of the soil, controlling effective hydraulic conductivity at varying water contents, following Brooks and Corey (1964). Can be set by soil_type. Typically denoted "h_b".
wetting_front_capillary_pressure_head : The effective head at the wetting front in the soil driven by capillary pressure in the soil pores. If not set, will be calculated by the component from the pore size distribution and bubbling pressure, following Brooks and Corey. +
G
manning's n for vegetation
manning's n for soil
critical shear stress for vegetation
critical shear stress for soil
rainfall
infiltration +
F
mixture equations (derived from two-phase theory with fine sediment assumption). k-epsilon closure derived from two-phase theory. Bingham rheology. Floc property is based on fractal structure. Bottom boundary condition for mud is based on type I erosion. +
M
R
T
none +
