Wind Shear Modeling for Aircraft Hazard Definition
Interim rept. Apr 1976-Mar 1977
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HUNTSVILLE AL GEORGE C MARSHALL SPACE FLIGHT CENTER
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This document presents a discussion of the various types of wind shear which cause problems to aircraft operations. The presentation is limited to low-level wind shear such as could be encountered in the vicinity of airports by aircraft on approach to landing and on takeoff. The types of shear discussed are primarily limited to frontal, thunderstorm and shears associated with stable and neutral boundary layers. The discussions emphasize modeling of the wind shear for simulation purposes. Wind shear is discussed not only as a change in absolute wind speed but also as a result of wind direction change. Some insight is given relative to a combination of wind speed and direction change. It is to be noted that the condition affecting aircraft operations is not one shear parameter but is a combination of several, e.g. horizontal shear, vertical shear, wind direction change and height of shear above ground level.