Temperature

Surface temperatures have been precalculated for each hour of a 30 year period, using the Enhanced Integrated Climate Model (EICM), for a number of climate zones and different pavement structures  in California.  The values are stored in the database EICM.mdb. The temperatures at different depths are  calculated using the surface temperature, a constant deep soil temperature and the previous temperatures. It is done using a 1-D Galerkin Finite Element formulation with a finite difference time step. Calculation over one year is used to initialize the system.

If the temperature database is not available, CalME will calculate the temperature from:

where tYearMean is the mean yearly surface temperature, oC,

 YearRange is the yearly range in surface temperature, oC,

 DayRange is the daily range in surface temperature, oC,

 z is the depth in mm, and

 h is the hour counted from the start of the year.

The yearly mean, yearly range and daily range temperatures are stored in the “Climate zone” table.