modules_Volumetric (08/20/09)

Volumetric

Defined in ClassVolumetric. The purpose of this module is to display the volumetric soil moisture as calculated from the variables in the module "Soil" and the properties of the soil.  Additionally, on a selected date in the fall it sets the parameter " fallstat" handle the infiltration into frozen soil for the following spring as determined from the soil properties and the soil moisture variables in the module "Soil".

Observations

• none

Variables

• Volumetric () - fractional volumetric soil moisture and equals (soil_moist[hh]/soil_Depth[hh] + SetSoilproperties[soiltype[hh]][1])/1000.0).

Parameters

• soil_Depth (m) - soil column depth.
• soil_type () - soil column. 0 - 12, water/sand/loamsand/sandloam/loam/siltloam/sasclloam/clayloam/siclloam/sandclay/siltclay/clay/pavement.
• set_fallstat () - Julian day when the fallstat parameter is set from the current soil moisture

    The following parameters are set by this module from the above information and need not be set.

• fallstat () - percentage of pore space holding water and equals Volumetric*100.0.

Variable Inputs

• soil_moist (*) (mm) - from module Soil etc.

Notes

1. During the first interval of execution,  if set_fallstat is greater than the current Julian date, fallstat is set.  Otherwise, only on the last interval of the actual Julian date.

 

available (mm)	wilt (mm)	field capacity (mm)	pore space ()
1000.0	0.0	1000.0	1000.0	0 water
84.0	40.0	124.0	395.0	1 sand
80.0	60.0	140.0	410.0	2 loamsand
130.0	100.0	230.0	435.0	3 sandloam
157.0	110.0	267.0	451.0	4 loam
162.0	130.0	292.0	485.0	5 siltloam
170.0	140.0	310.0	420.0	6 saclloam
167.0	150.0	317.0	476.0	7 clayloam
150.0	190.0	340.0	477.0	8 siclloam
150.0	200.0	350.0	426.0	9 sandclay
150.0	210.0	360.0	492.0	10 siltclay
145.0	215.0	360.0	482.0	11 clay