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KMID : 1024519990080020145
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Journal of the Environmental Sciences
1999 Volume.8 No. 2 p.145 ~ p.150
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On the Thermal Effect of Vegetation Canopy to the Surface Sublayer Environment Part 1 : Numerical Experiment
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Jin Byong-Hwa
Hwang Soo-Jin
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Abstract
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To estimate the thermal effect of the vegetation canopy on the surface sublayer environment numerically, we used the combined model of Pielke’s1) single layer model for vegetation and Deardorff’s2) Force restore method(FRM) for soil layer. Application of present combined model to three surface conditions, ie., unsaturated bare soil, saturated bare soil and saturated vegetation canopy, showed followings; The diurnal temperature range of saturated vegetation canopy is only 20K, while saturated bare soil and unsaturated bare soil surface are 30K, 35K, respectively. The maximum temperature of vegetation canopy occurs at noon, about 2 hours earlier than that of the non-vegetation cases. The peak latent heat fluxes of vegetation canopy is simulated as a 600Wm-2 at 1300 LST. They have higher values during afternoon than beforenoon. Furthermore, the energy redistribution ratios to latent heat fluxes also increased in the late afternoon. Therefore, oasis effect driving from the vegetation canopy is reinforced during late afternoon compared with the non-vegetated conditions.
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KEYWORD
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vegetation canopy, surface layer environment, latent heat flux, oasis effect
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