Noise Dispersion - Noise Modeling - Noise Prediction - Sydney - NSW - New South Wales

Pollution Control Consultancy and Design carries out noise prediction
(noise propagation, noise dispersion) modelling that takes into account:

1. spectrum of noise (frequency of noise in octave or one-third octave bands);

2. geometric spreading (divergence, distance attenuation) of noise;

3. absorption of noise by air depending on atmospheric temperature, pressure and humidity;

4. atmospheric stability (temperature gradient effects, temperature inversion);

5. speed and direction of wind;

6. topography;

7. ground effects (absorption); and

8. presence of roads, industrial sites, buildings, noise barriers, enclosures and foliage.

Depending on project-specific requirements, we carry out the noise dispersion modelling with five different programs (software), viz.

1. Brüel & Kjær (B&K) Predictor 7810 (Denmark) - industrial, road traffic and railway noise;

2. DataKustic Cadna A (Germany) - industrial, road traffic and railway noise;

3. RTA Environmental Noise Model (ENM) (Australia) - industrial noise;

4. Federal Highway Administration (FHWA) Traffic Noise Model (FHWA TNM)
(United States) - road traffic noise; and/or

5. Pollution Control Consultancy and Design (PCCD) developed-in-house industrial noise
model (Australia).

Below, an example of results of our noise dispersion modelling with
the PCCD developed-in-house software -
- isopleths (isophones) of the L_Aeq,T around drilling operation (source of noise at 0,0):

Such results allow to significantly reduce noise impact in sensitive directions just by proper orientation of noisy equipment.

NOTE that the isopleth of 50 dB(A) reaches:

450 metres on the East;
500 metres on the West;
just over 500 metres on the South; and
nearly 1100 metres on the North.