ON THE EFFECTIVE ROUGHNESS LENGTH FOR HETEROGENEOUS TERRAIN

被引:35
作者
VIHMA, T [1 ]
SAVIJARVI, H [1 ]
机构
[1] UNIV HELSINKI,DEPT METEOROL,SF-00100 HELSINKI 10,FINLAND
关键词
D O I
10.1002/qj.49711749808
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Several theories and a mesoscale model were applied in the calculation of the effective roughness length Z(o)eff over heterogeneous flat terrain having varying proportions of land and water. Rules based on terrain classification tended to give large values of Z(o)eff, while the simple logarithmic areal average of local roughness lengths gave small values compared with the model output. The most recent theories were quite close to the model results. These theories were then used to produce a map of Z(o)eff for 150 x 150 km2 grid squares over Finland, based on a detailed knowledge of land use and water coverage.
引用
收藏
页码:399 / 407
页数:9
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