Analysis of low-level wind field around airports using a diagnostic model

Wind shear is the change of wind speed and/or wind direction between two spatial points over a short distance in the atmosphere. Generally, wind shear is not a serious hazard to aircraft flying in normal altitude. However, strong and sudden low-level wind shear around the runway can be fatal for aircraft taking off and landing. Therefore, Low-level Windshear Alert System (LLWAS) was developed to detect this phenomenon. However, LLWAS only use point information around the runway corridor for divergence calculation and comparison of wind speed among sensors. It is not suitable for airports with significant topographical influences nearby. To address this problem, a diagnostic model in which topography is considered was used to solve the above problem of LLWAS. In this study, California Meteorological Model (CALMET) was selected to solve the problem