A scheme for drag partition over rough surfaces

被引：65

作者：

Shao, YP ^{[1
]}

Yang, Y ^{[1
]}

机构：

[1] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China

来源：

ATMOSPHERIC ENVIRONMENT | 2005年 / 39卷 / 38期

关键词：

drag partition; effective frontal area index; roughness length; rough surface; turbulence;

D O I：

10.1016/j.atmosenv.2005.09.014

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We present it drag partition scheme for surfaces of various roughness densities. The total drag is partitioned into three components: a pressure drag, a skin drag due to momentum transfer to the surfaces of roughness elements and a surface drag due to momentum transfer to the ground surface. We introduce an effective frontal area index to characterize the mutual sheltering effect of roughness elements on drag partition and propose a method for the calculation of the drag components. The drag partition scheme is then applied to the calculation of bulk quantities such its roughness length and zero-plane displacement height. The results are compared with wind-tunnel measurements. Roughness length is found to increase with frontal area index). to a maximum at about lambda = 0.2, and then decreases with lambda. This finding is in agreement with observations. The drag partition scheme has applications to studying scalar exchange in boundary layers over rough surfaces, such as urban boundary layers. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：7351 / 7361

页数：11

共 30 条

[1] DRAG PARTITION THEORY FOR DETERMINING LARGE-SCALE ROUGHNESS PARAMETER AND WIND STRESS ON ARCTIC PACK ICE [J].

ARYA, SPS .

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS AND ATMOSPHERES, 1975, 80 (24) :3447-3454

[2] Roughness parameters over regular rough surfaces: Experimental requirements and model validation [J].

Bottema, M .

JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 1996, 64 (2-3) :249-265

[3] Near wall flow over urban-like roughness [J].

Cheng, H ;

Castro, IP .

BOUNDARY-LAYER METEOROLOGY, 2002, 104 (02) :229-259

[4] WIND TUNNEL DETERMINATION OF ROUGHNESS LENGTH AS A FUNCTION OF FETCH AND ROUGHNESS DENSITY OF 3-DIMENSIONAL ROUGHNESS ELEMENTS [J].

COUNIHAN, J .

ATMOSPHERIC ENVIRONMENT, 1971, 5 (08) :637-&

[5] Drag partition for regularly-arrayed rough surfaces [J].

Crawley, DM ;

Nickling, WG .

BOUNDARY-LAYER METEOROLOGY, 2003, 107 (02) :445-468

[6] Field determination of drag forces and shear stress partitioning effects for a desert shrub (Sarcobatus vermiculatus, greasewood) [J].

Gillies, JA ;

Lancaster, N ;

Nickling, WG ;

Crawley, DM .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2000, 105 (D20) :24871-24880

[7]

HALL DJ, 1996, 17896 BRE CR

[8] Scalar Fluxes from Urban Street Canyons Part II: Model [J].

Ian N. Harman ;

Janet F. Barlow ;

Stephen E. Belcher .

Boundary-Layer Meteorology, 2004, 113 (3) :387-410

[9] ON THE DISPLACEMENT HEIGHT IN THE LOGARITHMIC VELOCITY PROFILE [J].

JACKSON, PS .

JOURNAL OF FLUID MECHANICS, 1981, 111 (OCT) :15-25

[10]

Lettau H, 1969, J APPL METEOROL, V8, P828, DOI [DOI 10.1175/1520-0450(1969)0082.0.CO

← 1 2 3 →