Abstract
The main objective of this study is to develop an methodology for estimating the water and heat transfer in a soil at a macro-hydrologic grid. Macro-scale formulas for a soil model, which include water and heat transfer, is derived from Philip and de Vries model and contain areal average terms and covariance terms of physical quantities. The sensitivity of model parameters is analyzed and a numerical simulation was examined. The major conclusions obtained here are as follows:(1) soil temperature profile doesn't change so much but the difference will have an effect on landatmosphere interactions.(2) soil moisture profile changes significantly and it will make a land surface heat budget modified.
