WASH_1D is a software to solve governing equations (parabolic partial differential equations) for one-dimensional movement of water, solute and heat in soils with the finite difference method.
Model Features
- Numerical inversion of hydraulic properties for three methods:
- Multi-step outflow method (Eching et al.,1993)
- Evaporation method with tensiometers (Simunek et al., 1998)
- Evaporation method without tensiometers(Fujimaki and Inoue, 2003)
- Optimization of irrigation depth
- Simulation of automatic irrigation
- Soil water retention function: flexible bimodal retention function and modified Shiozawa's function are employed.
- Following phenomia are considered:
- Layered soil
- Hysteresis in water retention
- Water vapor movement
- Dependense of albedo on water content
- Root water uptake with a macroscopic root water uptake model
- Plant growth
Therefore, actual evaporation and transpiration rates can be predicted by inputting meteorological conditions
Features of User Interface
- Animated display of the result
- Combined with a XY-plotter. Following graphs can be output:
- retention curve and hydraulic conductivity at input parameter values
- Water content profile at the end
- Comparison of measured and optimized value (for inverse mode).
[ explanation of demo cases ]
[ License ]