Numerical study on the bulk heat transfer coefficient for a variety of vegetation types and densities |
| |
Authors: | Junsei Kondo Atsuko Kawanaka |
| |
Affiliation: | 1. Geophysical Institute, Tohoku University, Sendai, Japan
|
| |
Abstract: | The relationship between the geometrical structure of a canopy layer and the bulk transfer coefficient was investigated using a numerical canopy model. The following results were obtained: - The bulk transfer coefficients for momentum and heat, C M and C H , change with non-dimensional canopy density C * each has a maximum.
- The value of C M is always larger than the value of C H for a canopy with c m > c h , c m and c h being the drag coefficient and the heat transfer coefficient of an individual canopy element, respectively.
- The value of C * at which C H has its maximum value is larger than the value of C * at which C M has its maximum. Therefore, the reciprocal of the sublayer Stanton number b h ?1 ranges between 50 and 65 for C * around 0.1 while it ranges between 0 and 30 for C * < 10?2 and C * > 2 (when c m = 0.5).
- The value of B H ?1 in the present study is consistent with most available observations, except for canopies of medium density (when C * is around 0.1) for which no observational value has been obtained.
|
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|