Intrastorm fluctuations of piezometric head and soil temperature within a steep forested hollow

Coupled measurements of storm runoff, piezometric response, and thermal flu ctuations were conducted at a steep forested hollow (0.25 ha) in Hitachi Oh ta, Japan. Short-term variations in soil temperature during an intensive st orm indicate that convergent subsurface flow caused rapid piezometric rise in the head of the hollow. Soil temperature changed rapidly even during sat urated conditions, indicating that aggregate contributions of intensive rai nfall and convergent flow cause considerable mixing between rainwater and g roundwater.