To identify the prone airspace of complex terrain-induced low-level windshear at Hong Kong International Air port(HKIA), large eddy simulation(LES) method was used to simulate the wind field of the airport and its surrounding terrain. The wind speed changes at the take off and landing paths of three runways under the background of east, southeast, south and southwest wind were compared combined with wind speed cloud map, and the causal relationship between the terrain and the wind field distribution was analyzed. By comparing the results with the control test without terrain, the F-factor (headwind) and 7-knot standard (crosswind) were employed to identify the prone regions of low-level windshear at the airport runway. The results showed that the east wind was easy to cause the temporal and spatial variation of the headwind speed at the take off and landing paths of the aircraft.
The southwest wind affected the headwind speed at the landing path on the east side of the runway, but had little effect on the take-off path on the west side of the runway. Under the background of southeast wind and the south wind, the crosswind in the low altitude section at the approach-departure paths of the three runways were signifi cantly affected by the terrain. According to prone airspace of the low-level windshear at take off and landing paths of three runways, the influence range of topographic factors on low-level windshear of HKIA was obtained, which can provide active avoidance measures and suggestions for airport windshear risk prevention and control.
