Session 2A

Session 2A

Inverse Problem - One-Step Outflow Method

Project Manager Button “New”
Name: Onestep
Description: Onestep Outflow Method
Button “OK”

Main Processes Heading: Onestep Outflow Method
Check “Inverse Solution”

Inverse Solution Check “Soil Hydraulic Parameters”
Check “No Internal Weighting”
Max. Number of Iteration: 20
Number of Data Points: 10

Geometry Information Number of Soil Materials: 2
Number of Layers for Mass Balances: 2
Depth of the Soil Profile: 4.52

Time Information Time Units: Hours
Final time: 100
Initial Time Step: 0.001
Minimum Time Step: 0.0001
Maximum Time Step: 10

Print Information Uncheck “Screen Output”
Number of Print Times: 10
Button "Select Print Times": 0.017, 0.033, 0.05, 0.167, 0.5, 1.33, 5.417, 10, 15, 100
Water Flow - Iteration Criteria Upper Limit of the Tension Interval: 15000

Water Flow - Soil Hydraulic Model

Water Flow - Soil Hydraulic Parameters Initial Estimate: qr=0.15, qs=0.388, a=0.025, n=1.5, Ks=5.4, l= 0.5
Fitted: qr, a, n
Second Material: qr=0., qs=1., a=1e-20, n=1.001, Ks=0.003, l= 0.5

Water Flow - Boundary Conditions Upper Boundary Condition: Constant Flux
Lower Boundary Condition: Constant Pressure Head

Water Flow - Constant BC Upper Boundary Flux: 0

Data for Inverse Solution

Soil Profile - Graphical Editor Menu: Options->Grid - Height: 0.05
Menu: Condition->Profile Discretization
Button “Number”: 50
Button “Insert Fixed” at 3.95 cm
Button “Density”: deselect “Use upper”, upper density =0.1 at 3.95 cm
Menu: Condition->Initial Condition->Pressure Head
Button “Edit condition”
Select entire profile: Top value=-2, Bottom value=2.52
Deselect “Use top value for both”
Lowest node = -1000 cm
Menu: Condition->Material Distribution
Button “Edit condition”
Select the ceramic plate and specify “Material Index”=2+ Ditto for “subregions”+ Observation Points?

Soil Profile - Summary

Execute HYDRUS

OUTPUT:

Water Flow - Boundary Fluxes and Heads Cumulative Bottom Flux


Soil Hydraulic Properties

Inverse Solution Information