Poster Number 916
See more from this Division: S01 Soil PhysicsSee more from this Session: Complexity  Addressing the Impacts of Linked Nonlinear Processes
Wednesday, November 3, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
Soil temperature and heat flux near the ground surface are essential to evaluate surface water and energy balances. Thermal properties of soil are required to estimate the heat flux and to predict the temperature variation; however, insitu measurement of the properties is timeconsuming and impractical to execute for large scale. First, we investigated the characteristics of half order fractional derivatives (semiderivatives) of soil temperature variation. The semiderivatives of temperature change in relatively homogeneous soils were almost linearly related to temperature gradients. The coefficient of linearity agreed well with a square root of the soil thermal diffusivity. Initial condition had limited effects on the result. For the soil layer in which thermal diffusivity increased with depth, a little larger than half order of derivatives found to be appropriate. Based on the characteristics of the fractional derivatives, soil thermal diffusivity insitu was estimated using soil temperature gradients, and conductivity and heat capacity were obtained using measurement values of heat flux. Application of the fractional derivatives to assimilate temperature data will also be discussed.
See more from this Division: S01 Soil PhysicsSee more from this Session: Complexity  Addressing the Impacts of Linked Nonlinear Processes
<< Previous Abstract

Next Abstract