~ ~ ~ PURPOSE ~ ~ ~
this subroutine initializes soil physical properties
~ ~ ~ INCOMING VARIABLES ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
ddrain(:) |mm |depth to the sub-surface drain
i |none |HRU number
rock(:) |% |percent of rock fragments in soil layer
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ OUTGOING VARIABLES ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
rock(:) |none |exponential value that is a function of
|percent rock
sol_st(:,:) |mm H2O |amount of water stored in the soil layer
|on any given day (less wp water)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
Intrinsic: Exp, Sqrt
SWAT: Curno
~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
Defaults for ph and calcium mjw average of 20,000 SSURGO soils mjw rev 490
calculate water content of soil at -1.5 MPa and -0.033 MPa
compute drainable porosity and variable water table factor - Daniel
determine detached sediment size distribution
typical for mid-western soils in USA (Foster et al., 1980)
Based on SWRRB
Sand fraction
Silt fraction
Clay fraction
Small aggregate fraction
Large Aggregate fraction
Error check. May happen for soils with more sand
Soil not typical of mid-western USA
The fraction wont add upto 1.0
initialize water/drainage coefs for each soil layer
initialize water table depth and soil water for Daniel calculate infiltration parameters for subdaily time step
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| integer | :: | isol |