Home    |     Overview    |     Feedback    |     Impressum            
Previous: Water distribution
Next: Water flow in 2D

Stationary and transient 1-dimensional water flow

Video: Steady state flow through a layered column (1:24 min)
small (0.5 MB)
medium (2.1 MB)
large (10.6 MB)

Water flow in soils strongly depends on the degree of water saturation. Water-saturated conditions do exist but water-unsaturated conditions prevail. With decreasing water content the hydraulic conductivity exponentially decreases and the local hydraulic gradients therefore become larger.

Under conditions of stationary water flow the water content, pressure head, and the local pore water velocities do not change with time, but they vary considerably in space.

  

Start animation
 

 

Start animation

When the boundary conditions - i.e. the infiltration at the upper boundary - change, the system becomes non-stationary (transient). In response to such changes the pressure head, water content, and local pore water velocities change with time approaching gradually a new stationary flow field.

top  


Previous: Water distribution

Next: Water flow in 2D