All you need to solve the equation is the mean and amplitude at the surface,the period of the wave (one day or one year) and the thermal diffusivity of the sand.
Fortunately I keep this exact information printed on the survival cards I stash in my kits. Knowledge is power!
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.