scholarly journals Characteristics of intermittent turbulence in the upper stable boundary layer over Greenland

2007 ◽  
Vol 124 (3) ◽  
pp. 361-381 ◽  
Author(s):  
Clemens Drüe ◽  
Günther Heinemann
Keyword(s):  
Boundary Layer ◽  
Stable Boundary Layer ◽  
Intermittent Turbulence ◽  
Stable Boundary

scholarly journals Intermittent Turbulence and Oscillations in the Stable Boundary Layer over Land. Part I: A Bulk Model

2002 ◽  
Vol 59 (5) ◽  
pp. 942-958 ◽  
Author(s):  
B. J. H. Van de Wiel ◽  
R. J. Ronda ◽  
A. F. Moene ◽  
H. A. R. De Bruin ◽  
A. A. M. Holtslag
Keyword(s):  
Boundary Layer ◽  
Stable Boundary Layer ◽  
Intermittent Turbulence ◽  
Stable Boundary ◽  
Bulk Model

scholarly journals Intermittent Turbulence Associated with a Density Current Passage in the Stable Boundary Layer

2002 ◽  
Vol 105 (2) ◽  
pp. 199-219 ◽  
Author(s):  
Jielun Sun ◽  
Sean P. Burns ◽  
Donald H. Lenschow ◽  
Robert Banta ◽  
Rob Newsom ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Stable Boundary Layer ◽  
Density Current ◽  
Intermittent Turbulence ◽  
Stable Boundary ◽  
Current Passage

Intermittent Turbulence and Oscillations in the Stable Boundary Layer over Land. Part II: A System Dynamics Approach

2002 ◽  
Vol 59 (17) ◽  
pp. 2567-2581 ◽  
Author(s):  
B. J. H. Van de Wiel ◽  
A. F. Moene ◽  
R. J. Ronda ◽  
H. A. R. De Bruin ◽  
A. A. M. Holtslag
Keyword(s):  
Boundary Layer ◽  
System Dynamics ◽  
Stable Boundary Layer ◽  
Intermittent Turbulence ◽  
Stable Boundary

scholarly journals Análise do escoamento horizontal de movimento não turbulento na camada limite noturna sob influência de obstruções

2020 ◽  
Vol 42 ◽  
pp. e8
Author(s):  
Viviane Da Silva Guerra ◽  
Otávio Costa Azevedo ◽  
Felipe Denardin Costa ◽  
Pablo Eli Soares de Oliveira
Keyword(s):  
Boundary Layer ◽  
Turbulent Flow ◽  
Stable Boundary Layer ◽  
Vertical Flux ◽  
Horizontal Flow ◽  
Intermittent Turbulence ◽  
Local Conditions ◽  
Stable Boundary ◽  
Flow Variability ◽  
Physical Forcing

When turbulence is well developed, the diffusivity tends to quickly destroy other flow variability modes, so that the turbulent processes become dominant. However, in cases of weak or intermittent turbulence the turbulence scales are restricted to small values, both spatially and temporally. Non-turbulent processes can become important in such cases. This is particularly possible in the Stable Boundary Layer, some studies have focused on non-turbulent flow modes such as submeso, for example. Non-turbulent motions occur simultaneously on other scales and may to dominate the fluctuations of the horizontal flow and vertical flux The physical forcing of submeso flow is still poorly understood, but it is believed to depend significantly on local conditions such as topography and vegetation. The hypothesis assumed in this paper is that obstacles of different nature and dimensions, such as trees, buildings and topography elements affect different flow scales and analyze how turbulent and submeso processes are affected differently.

scholarly journals Intermittent Turbulence in the Stable Boundary Layer over Land. Part III: A Classification for Observations during CASES-99

2003 ◽  
Vol 60 (20) ◽  
pp. 2509-2522 ◽  
Author(s):  
B. J. H. Van de Wiel ◽  
A. F. Moene ◽  
O. K. Hartogensis ◽  
H. A. R. De Bruin ◽  
A. A. M. Holtslag
Keyword(s):  
Boundary Layer ◽  
Stable Boundary Layer ◽  
Intermittent Turbulence ◽  
Stable Boundary

scholarly journals Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 401
Author(s):  
Jonathan Biehl ◽  
Bastian Paas ◽  
Otto Klemm
Keyword(s):  
Boundary Layer ◽  
Stable Boundary Layer ◽  
Passive Scalar ◽  
City Center ◽  
Street Canyons ◽  
Stable Boundary ◽  
Northwest Germany ◽  
Stable Conditions ◽  
Les Model ◽  
The City

City centers have to cope with an increasing amount of air pollution. The supply of fresh air is crucial yet difficult to ensure, especially under stable conditions of the atmospheric boundary layer. This case study used the PArallelized Large eddy simulation (LES) Model PALM to investigate the wind field over an urban lake that had once been built as a designated fresh air corridor for the city center of Münster, northwest, Germany. The model initialization was performed using the main wind direction and stable boundary layer conditions as input. The initial wind and temperature profiles included a weak nocturnal low-level jet. By emitting a passive scalar at one point on top of a bridge, the dispersion of fresh air could be traced over the lake’s surface, within street canyons leading to the city center and within the urban boundary layer above. The concept of city ventilation was confirmed in principle, but the air took a direct route from the shore of the lake to the city center above a former river bed and its adjoining streets rather than through the street canyons. According to the dispersion of the passive scalar, half of the city center was supplied with fresh air originating from the lake. PALM proved to be a useful tool to study fresh air corridors under stable boundary layer conditions.

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