Modelling heat transport and freezing and thawing processes in a clayey, subsurface drained agricultural field

← Takaisin
Tekijä Warsta, L.; Turunen, M.; Koivusalo, H.; Paasonen-Kivekäs, M.; Taskinen, A
Sarja 11th ICID International Drainage Work-shop on Agricultural Drainage Needs and Future Priorities. Cairo
Päivämäärä 2012
Avainsanat Boreal environment, clay soil, FLUSH model, heat transport, subsurface drain
Sivut 23-27
Kieli englanti
Saatavuus Modelling heat transport and freezing and thawing processes in a clayey, subsurface drained agricultural field
Understanding soil heat processes is important in the Boreal environment characterized by
seasonal snowfalls and soil freezing and thawing processes. FLUSH is a new 3-D distributed,
process-based model for simulating water flow and soil erosion in clayey, subsurface drained
field sections. The objective of the study was to implement heat transport and soil freezing
and thawing processes into the model. At this point heat related processes do not affect soil
hydrology but water regime affects heat transport processes. The model was applied into data
gathered in a clayey, subsurface drained field section in southern Finland. According to the
results, the model functioned as intended and temperature changes were slowed down due to
freezing and thawing processes near 0 °C. Simulation results indicated that higher grounds,
which tend to stay drier, also stayed warmer during cold periods (0.7 °C) due to insulation
effect of air compared to lower wetter areas. In the late spring the difference was as high as 5
°C. The direction of the slope and shadow cast by a nearby forest edge also had a notable
effect on temperature.