关键词: 山区林地, 粗糙度, 模型

Abstract: Applying actually measured data we have calculated the bulk parameterization of momentum, apparent and latent heat fluxes, roughness as well as the related bulk transfer coefficients, CM, CH and CE in a hilly region with vegetation. In the study, the relative surface temperature and relative humidity profiles with canopy were also measured. By use of the maximum correlation method, the roughness length and zero-plane displacement for wind, Z0M and d0M, were determined. The roughness length for water vapor (Z0H) was evaluated by sassuming that θS=θRAD. The result indicates that the Stanton number, S-1t=ln(Z0M/Z0H)/K, shows larger value as compared with past investigations. And zero-plane displacement for temperature d0H(=11.9) was almost same value as d0M (=12.8). Base on the modified bulk formulation by use of the surface wetness parameter α, the value α was evaluated as 0.61, which agreed well with the relative humidity, near the canopy top. This calculation method and model could be applied in the Heihe river basin.

Key words: forest in hilly region, roughness length, model