Noise Contours (One Decibel) for King County International Airport

Noise contours are based on noise and contour modeling. Contour modeling is a very key element of the FAA FAR Part 150 Study. It is imperative that these contours be accurate for the meaningful analysis of airport and roadway noise impacts. The noise contours can then be used to predict the changes to the noise environment as a result of any of the development alternatives under consideration. The FAA Integrated Noise Model (INM) Version 6 was used to model the flight operations contours at King County International Airport (KCIA). INM Version 6 was released for use in October 1999. One of the most important factors in generating accurate noise contours is the collection of accurate operational data. The INM programs require the input of the physical and operational characteristics of the airport. Physical characteristics include runway coordinates, airport altitude, and temperature and optionally, topographical data. Operational characteristics include various types of aircraft data. This includes not only the aircraft types and flight tracks, but also departure procedures, arrival procedures and stage lengths that are specific to the operations at the airport. Aircraft data needed to generate noise contours include: number of aircraft operations by type, types of aircraft, day/evening/night time distribution by type, flight tracks, flight track utilization by type, flight profiles, typical operational procedures, and average meteorological conditions.噪声等值线（noise contours）的构建基于噪声建模与等值线建模技术。等值线建模是美国联邦航空管理局（Federal Aviation Administration, FAA）《联邦航空条例（FAR）第150部》研究的核心环节之一。为开展机场与道路噪声影响的有效分析，此类等值线的精准性至关重要。后续可借助该噪声等值线，针对待论证的各类开发方案，预测噪声环境的变化态势。本次研究采用FAA综合噪声模型（Integrated Noise Model, INM）第6版，对金县国际机场（King County International Airport, KCIA）的飞行作业噪声等值线开展建模工作。INM第6版于1999年10月正式发布并投入使用。生成精准噪声等值线的核心影响因素之一，是获取准确的机场运行数据。INM程序需要输入机场的物理特性与运行特性两类参数，其中物理特性参数包括跑道坐标、机场海拔、气温以及可选的地形数据，运行特性参数则涵盖各类航空器相关数据。此类数据不仅包含航空器类型与飞行航迹，还包括该机场特有的起飞程序、着陆程序以及航段长度（stage lengths）。用于生成噪声等值线的航空器数据具体包括：按机型划分的航空器作业架次、航空器类型、按机型划分的昼/晚/夜间作业分布、飞行航迹、按机型划分的航迹使用率、飞行剖面、典型运行程序以及平均气象条件。