LARGE-EDDY SIMULATIONS OF THE EFFECTS OF HILLY TERRAIN ON THE CONVECTIVE BOUNDARY-LAYER

被引：57

作者：

WALKO, RL

COTTON, WR

PIELKE, RA

机构：

[1] Department of Atmospheric Science, Colorado State University, Fort Collins, 80523, CO

来源：

BOUNDARY-LAYER METEOROLOGY | 1992年 / 58卷 / 1-2期

关键词：

D O I：

10.1007/BF00120755

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Large-eddy simulations of the convective boundary layer are compared over hilly versus flat surfaces. Moderate values for the height and horizontal spacing of the hills were selected. Thermally-direct hill-valley circulations are induced by the uneven terrain, accounting for a significant fraction of the resolved energy in the boundary-layer eddies. The probability of upward eddy motion reaches up to 70% over the hilltops and down to 15% over the valleys. Above-average values of both subgrid scale turbulent kinetic energy and upward eddy heat transport are found above the higher terrain. Horizontal spectra of vertical motion are strongly biased toward the horizontal scales of the terrain. Vertical profiles of atmospheric variables obtained by horizontal averaging, however, exhibit no significant differences between hilly and flat terrain simulations.

引用

页码：133 / 150

页数：18

共 29 条

[1]

BUSINGER JA, 1971, J ATMOS SCI, V28, P181, DOI 10.1175/1520-0469(1971)028<0181:FPRITA>2.0.CO

[2]

[3] THE LONG-RANGE DISPERSION OF A PLUME FROM AN ISOLATED POINT-SOURCE [J].