Comparison of lateral attenuation at the four airports in Japan

摘要

We have been considered equations of lateral attenuation for aircraft noise prediction modeling by using data of both long-term continuous monitoring of aircraft noise and short-term measurements repeatedly carried out at NARITA Airport. As a result, the lateral attenuation depends not only on the weather condition but also on the characteristics of ground surface on propagation path, and it is found that it may not be consistent with existing equations of lateral attenuation in some cases. In a previous report, we examined about lateral attenuation based on short-term measurements carried out around SENDAI Airport with flat and uniform fields. As a result, the lateral attenuation increased smoothly with distance, and it was found that it was in good agreement with the existing lateral attenuation equations. Therefore, we carried out another short-term measurement at KAGOSHIMA Airport with flat fields besides of runway and OSAKA Airport in the city area. As a result, it was found that the lateral attenuation is different between the urban area and the field, and even in the same field it is clearly different depending on with or without of the crop and the height of the crop.