Analyses of coupled heat and water transfer between soil and lower atmosphere by a simulation model

This research is carried out with the objective of predicting quantitatively the water and heat budgets due to changes in land use through the analysis of typical surface elements, i.e., water and heat budgets in the atmosphere and soil, by the use of SALSA (Soil-Atmosphere Linking Simulation Algorithm). Numerical solutions of momentum, heat and mass transport equations are available for prediction of physical processes occurring in atmospheric boundary layer and in porous bodies. The processes in the atmosphere and in the porous bodies are linked each other through the equations of heat and mass conservation. The water mass in the soil is treated as a two-phase mixture of liquid water and vapour. The simulated results are supported by the observation data recorded with a meteorological station placed in the experimental field in Hanno new resident town, Saitama prefecture. SALSA has so far been applied only under simple surface conditions such as bare land. In this research, however, it is dealt with surface conditions other than bare land. In this research, typical surface elements are divided into 4 categories, i.e., bare land, soddy land, forest and pavement, and the water and heat budgets due to these individual land uses are subjected to analysis. The analysis of water and heat budgets by SALSA in the stage of city planning makes it possible to quantitatively predict an influence on the environment after development.