No abstract

No abstract

No abstract

The peak sound levels from 117 charges of gelignite, with weights ranging from 1 to 17 kg, were monitored over a 4-day period at 17 locations, whose distances from the source varied from 100 m to over 10 km. A total of 1639 measurements was recorded. Detailed meteorological data were collected using ground-level monitors and radar-tracked radio sonde ascents enabling wind velocity and temperature profiles to be established from the surface to a height of 3000 m, for each half-hour period throughout the trial. The data set has been used to test and modify an empirical equation relating the peak sound level to the density of sound rays returning to the surface.

Helicopter noise has a negative impact on the quality of life for many people. Effected populations are not just those living close to heliports, but include those exposed to noise from helicopters used by emergency services, the military, and commercial companies. One problem identified in the UK is that it is often difficult to complain about helicopter noise, since it is unclear which organization is responsible for dealing with the complaint. Consequently, the Department for Environment, Food and Rural Affairs (Defra, UK) has commissioned research to summarize the following: i. the nature and extent of the concern about helicopter noise in the UK ii. rules and regulations governing operations iii. existing procedures for handling complaints This stage of the project will produce a detailed report into the improvement of the management of helicopter noise. Also to be produced is a short non-technical guide including the means of redress for perceived disturbance. This paper reports on the findings of this project.