scholarly journals Numerical modelling of velocity profile parameters of the atmospheric boundary layer simulated in wind tunnels

2018 ◽  
Vol 393 ◽  
pp. 012025
Author(s):  
A Abubaker ◽  
I Kostić ◽  
O Kostić
Keyword(s):  
Boundary Layer ◽  
Numerical Modelling ◽  
Velocity Profile ◽  
Atmospheric Boundary Layer ◽  
Wind Tunnels

scholarly journals On the algebraic perturbations in atmospheric boundary layer

2019 ◽  
Vol 55 (5) ◽  
pp. 62-75
Author(s):  
O. G. Chkhetiani ◽  
N. V. Vazaeva
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
High Resolution ◽  
Simple Model ◽  
Velocity Profile ◽  
Atmospheric Boundary Layer ◽  
Wind Field ◽  
Acoustic Sounding ◽  
Algebraic Instability ◽  
Scientific Station

A simple model for the development of submesoscale perturbations in the atmospheric boundary layer (ABL) is proposed. The growth of perturbations is associated with the shear algebraic instability of the wind velocity profile in the atmospheric boundary layer (ABL). For the scales of optimal perturbations (streaks) in the lower part of the ABL, estimates of their sizes were obtained about 100-200 m vertically and 300-600 m horizontally. Similar scales are noted for experimental data on the structure of the wind field in the lower part of the ABL, obtained in 2017, 2018 in the summer at the Tsimlyansk Scientific Station at the acoustic sounding of the atmosphere by the Doppler three-component minisodar of high resolution.

Novel Physical Simulators for Non-Synoptic Wind Systems

2020 ◽  
Author(s):  
Horia Hangan ◽  
Maryam Refan ◽  
Partha P. Sarkar ◽  
Delong Zuo
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Three Dimensional ◽  
Wind Tunnels ◽  
Wind Effects ◽  
The Past ◽  
Synoptic Wind ◽  
Physical Simulations ◽  
Wind Events ◽  
New Generation

The study of wind effects on buildings and structures is primarily based on physical simulations of wind events. Synoptic, atmospheric boundary layer (ABL) winds have been simulated in boundary layer wind tunnels. Non-synoptic wind events such as tornadoes and downbursts are three-dimensional, dynamic, and non-stationary, and, as a result, a new generation of physical simulators have emerged in the past decades. Some of these simulators, their performances as well as their limitations, are reviewed in this chapter.

Submesoscale physical processes in the atmospheric boundary layer above fragmented sea ice.

2020 ◽  
Author(s):  
Marta Wenta ◽  
Agnieszka Herman
Keyword(s):  
Boundary Layer ◽  
Numerical Modelling ◽  
Sea Ice ◽  
Atmospheric Boundary Layer ◽  
Weather Prediction ◽  
Heat Fluxes ◽  
Physical Processes ◽  
Sea Ice Extent ◽  
Field Campaign ◽  
Modelling Studies

<p>In consequence of sea ice fragmentation in winter a range of physical processes take place between the sea/sea ice and the atmospheric boundary layer (ABL). Most of them occur on the level of individual ice floes and cracks and thus cannot be directly resolved by numerical weather prediction (NWP) models.  Parametrizations of those processes aim to describe their overall effect on grid scale values, given the grid scale variables. However, as many of the processes taking place during winter sea ice fragmentation remain largely unrecognized they cannot be incorporated into the NWP models. </p><p>The aim of the presented study is to determine whether the floe size distribution (FSD) has an effect on the ABL. Our previous research (Wenta, Herman 2018 and 2019) indicates that FSD might determine the intensity and spatial arrangement of convection and heat fluxes. A coefficient has been proposed for the correction of moisture heat flux, which can be incorporated into the NWP models. However, this research is based entirely on idealized model simulations and requires further modelling and observations based studies.</p><p>In order to address this shortcoming, a field campaign is going to take place in the Bay of Bothnia in March 2020. Our goal is to create a 3D view of the atmosphere above fragmented sea and verify whether the processes and effects we found in the modeling results take similar form in real situations. Measurements results will be useful in the validation of our numerical modelling studies and will provide a unique dataset about the sea-ice-atmosphere interactions in the Bay of Bothnia area. Considering a significant decreasing trend in winter sea ice extent in the Baltic Sea it might contribute to our understanding of the role of ice in the local weather patterns. The field campaign is going to be complemented by numerical modelling with full version of Weather Research and Forecasting (WRF) model adjusted to the conditions over the Bay of Bothnia. </p><p>Combined together - the results of our previous modelling studies and the results from the Bay of Bothnia field campaign, may considerably increase our knowledge about the surface-atmosphere coupling in the event of winter sea ice fragmentation.</p>

Atmospheric boundary layer sound velocity profile model for wind and temperature

1997 ◽  
Vol 101 (5) ◽  
pp. 3103-3103
Author(s):  
David C. Swanson ◽  
Karl M. Reichard ◽  
Kathy T. McClintic ◽  
David Norris
Keyword(s):  
Boundary Layer ◽  
Velocity Profile ◽  
Atmospheric Boundary Layer ◽  
Sound Velocity ◽  
Sound Velocity Profile ◽  
Profile Model
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