Results 1 to 10 of about 10,720 (262)

Sporadic E-like Topside Layer Driven by Wind Shear in the Martian Ionosphere

open access: yesThe Astrophysical Journal
Ionospheric plasma density disturbances significantly affect radio wave propagation, impacting communication and planetary exploration. At Earth, sporadic E layers (Es) are commonly observed. They are characterized by thin, high-density plasma structures
Rong Tian   +10 more
doaj   +1 more source

Influence of Low‑Level Wind Shear on Flight Characteristics of Large Helicopters

open access: yesNanjing Hangkong Hangtian Daxue Xuebao
To analyze the influence of low-level wind shear on the flight characteristics of a large helicopter during takeoff, a wind shear model and a helicopter flight dynamics model coupled with wind interference are established.
YE Yi, CHEN Renliang, WEI Yuan
doaj   +1 more source

Periodicity of the average wind shear

open access: yesProceedings of the Estonian Academy of Sciences. Engineering, 2007
Higher level wind speeds are traditionally predicted either on the basis of the widely used logarithmic equation or using the Hellmann equation. In both equations, a coefficient that assesses the average wind shear curvature is usually used. This coefficient has been considered to be a constant, depending on the roughness of the surrounding landscape.
Teolan Tomson, Hannu Lamp
openaire   +1 more source

Spatiotemporal Distribution Characteristics Research of Wind Field and Wind Shear on the East Coast of Erhai Lake in the Southeast Edge of Hengduan Mountain Area

open access: yesGaoyuan qixiang
Wind profiling radar is a remote sensing device that boasts high spatiotemporal resolution and good consistency with sounding data, capable of probing the vertical distribution of atmospheric wind fields.Dali Airport, situated at the western edge of the ...
Kunlin YANG   +4 more
doaj   +1 more source

Impact of wind shear on aerosol–cloud interactions and convective precipitation

open access: yesFrontiers in Environmental Science
The impact of wind shear on aerosol-cloud interactions and convective precipitation is investigated with real-case simulations using the ICOsahedral Non-hydrostatic (ICON) model over central Europe.
Mathis Tonn   +3 more
doaj   +1 more source

Modeling the effect of wind speed and direction shear on utility‐scale wind turbine power production

open access: yesWind Energy
Wind speed and direction variations across the rotor affect power production. As utility‐scale turbines extend higher into the atmospheric boundary layer (ABL) with larger rotor diameters and hub heights, they increasingly encounter more complex wind ...
Storm A. Mata   +7 more
doaj   +1 more source

Explainable Learning Framework for the Assessment and Prediction of Wind Shear-Induced Aviation Turbulence

open access: yesAtmosphere
Wind shear-induced aviation turbulence (WSAT) remains a major safety concern during approach and takeoff phases at complex terrain airports. This study develops an interpretable Explainable Boosting Machine (EBM) framework to classify WSAT events at Hong
Afaq Khattak   +4 more
doaj   +1 more source

Study on Vertical Extrapolation Model of Wind Speed in Inland Complex Wind Farms

open access: yesZhongguo dianli
According to the evaluation of onshore wind energy resources, the hub height of the wind turbine is greater than the height of the wind tower. The influences of atmospheric stability and surface roughness changes are ignored, and the wind shear index is ...
Rui HU   +3 more
doaj   +1 more source

Monitoring Characteristics and Environmental Field Analysis of Low-Level Wind Shear Induced by “Easterly Backflow” at Xining Airport

open access: yesAtmosphere
A significant low-level wind shear event that occurred at Xining Caojiabu Airport on 10 April 2019 was comprehensively analyzed. The analysis utilized data from the airport’s ground automatic weather observation system (AWOS), lidar detection data, ERA5 ...
Ziyi Xiao   +4 more
doaj   +1 more source

Analysis of Near-Surface Wind Shear Characteristics over Land in China

open access: yesAtmosphere
Wind shear is one of the crucial parameters in wind resource assessment and also serves as a vital parameter and basis for determining wind turbines’ selection and hub height.
Ling Yuan   +4 more
doaj   +1 more source

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