On the identification of weather avoidance routes in the terminal maneuvering area of Hong Kong International Airport

Abstract

Abstract:The safety and efficiency of air traffic are significantly affected by adverse weather. This holds especially in terminal maneuvering areas (TMA) where, in addition to the impact of weather itself, potential weather avoidance routes are strongly restricted by air traffic regulations. A weather avoidance model DIVMET has been developed which proposes a route through a field of developing thunderstorms. Air traffic control regulations have not been included in it at this stage. DIVMET was applied to the TMA of Hong Kong International Airport as air traffic control (ATC) there has become interested in improving the controller's work load, especially for managing incoming traffic by avoidance route simulations. Although visual inspection of simulated avoidance routes by ATC was satisfactory, a quantitative validation of simulated with real observed routes was also carried out. Two real adverse weather situations with thunderstorms within the TMA of Hong Kong and with heavily distorted traffic were chosen. The main objective prior to any validation, however, was to identify routes which are solely impacted by weather but do not show any signs of regulation. Route selection was done on the base of flight position data. Landing flights were selected and deviations from standard approach routes were analyzed. As a result, the majority of 272 flights were found to be affected by both weather and regulations (60%), highlighting the challenge for air traffic controllers to manage landing traffic under adverse weather conditions safely and efficiently. Only a few weather-affected flights (7%) were not regulated and could be used for validation. DIVMET simulation routes were presented to local air traffic controllers who confirmed them as potential and realistic avoidance routes. DIVMET weather avoidance route simulations within a TMA appear to be helpful but further model development has to incorporate traffic regulations, to include holdings, short-cuts, and slow-downs.

Short‐range probabilistic forecasting of convective risks for aviation based on a lagged‐average‐forecast ensemble approach

“…The smoothing reduces the maxima slightly; for this reason a reduction of the threshold is reasonable. A threshold of 7 mm h −1 is used, which is slightly below the value of 37 dBZ that is mentioned in the literature to affect aviation (Sauer et al ., ).…”

“…The value at which reflectivity starts to affect air traffic operations depends on several factors such as the aircraft type; ideally, the definition of a ‘significant’ convective intensity threshold event should reflect the fact that a competent pilot will decide whether or not to divert his/her flight to avoid it. Surveys in the aviation community have demonstrated that pilots tend to avoid regions with radar reflectivities above 37 dBZ, which corresponds to a precipitation intensity of about 7.5 mm h −1 (Sauer et al ., ).…”

Pilots’ Scanning Behavior Between Different Airport Intersection Maneuvers in a Simulated Taxiing Task

“…Weather conditions influence pilots' performances [9], [10]. Tamura et al [11] conducted a simulation study to examine the differences in pilots' scanning behavior during takeoff in daytime and nighttime situations.…”