Reconstruction of downburst wind fields using physics-informed …
2024年11月1日 · The maximum wind velocity of the downburst is observed at a distance of 1.0D jet = 600 mm from the jet in the steady state of flat terrain, with a magnitude velocity of approximately 12 m/s. As the radial distance increases, the horizontal velocity decreases gradually, and the high-wind velocity area forms a wedge-like shape in the horizontal ...
A simple downburst model has been developed for use in batch and real- time piloted simulation studies of guidance strategies for terminal area transport aircraft operations in wind shear conditions. The model represents an axisymmetric stagnation point flow, based on …
Downbursts - an overview | ScienceDirect Topics
Downbursts are defined as convective wind gusts upward of 50 knots. Mesoscale convective systems frequently produce strong downbursts that can cause widespread power outages, tree and structural damage, and transportation accidents that affect multistate regions and metropolitan areas along their track.
Assessing Downburst Kinematics Using Video Footage Analysis
2024年9月5日 · Using the estimates of the distances and knowing the frame rate of the video recording, we estimate characteristic velocities in the outflow, such as the mean velocity of descending downdraft and the mean velocity of the radial propagation of downburst outflow.
A general-purpose analytical model for reconstructing the …
2020年12月1日 · Starting from these premises, this paper proposes an analytical model that reconstructs the horizontal mean wind velocity at a fixed height above the ground, originating from a travelling downburst. The combined wind velocity experienced at a point where a downburst passes, is assumed to be the vector summation of three independent velocity ...
Automated Recognition of Macro Downburst Using Doppler …
2022年4月22日 · Automatic recognition algorithm for downburst area is that first input the reflectivity and radial velocity of 0.5° elevation, combine the reflectivity and radial velocity threshold to binarize the radial velocity; then use the Eight-Neighborhood method to retrieve the connected areas of positive and negative velocity; then the edge detection ...
Review of Wind Field Characteristics of Downbursts and Wind …
2024年8月26日 · Downbursts are characterized by their high intensity, sudden onset, substantial variability, significant regional impacts, and brief duration. They exhibit a distinctive three-dimensional wind field and a “nose-shaped” wind speed profile, with notable non-stationary and non-Gaussian characteristics [2, 3, 4, 5, 6] (Figure 2).
Downburst-like experimental impinging jet measurements at the …
2022年5月27日 · Downbursts are strong downdrafts of air that originate from thunderstorm clouds and create vigorous radial outflows upon hitting the ground. Downbursts are here simulated as transient phenomena...
Vertical Structure and Evolution of the Downburst - 1Library
Overall, the rapid-scan updates of the vertical evolution and structure of the downburst provided evidence that surges of mixed-phase precipitation cores aloft—indicated by reduced ρhv— descended to surface. These surges of descending precipitation indicate surges in the downburst.
A downburst event represents a downdraft of cold air that impinges on the ground, causing a main rolling vortex and outflows of high velocities and turbulence intensities near the ground that greatly affect low-rise buildings.