Glossary

CFD

computational fluid dynamics

dBA

Sound is measured in decibels (dB). When measuring environmental noise, a weighting network is used which filters the frequency of the sound so that it better corresponds to the response of the human ear. In this handbook, noise measurements made using such a weighting network are expressed as dBA.

dB(linear)

A measure of sound that relates to effects on structures rather than human hearing, dB(linear) peak is the maximum reading in decibels (obtained using the ‘P’ time-weighting characteristic as specifi ed in AS 1259.1—1990 Sound level meters, with all frequency weighted networks inoperative

DEM

dust extinction moisture

L(A)eq

In noise monitoring, the equivalent to the level of a constant noise which contains the same energy as the varying noise environment.

L(A)10

In noise monitoring, the noise level which is exceeded for 10 per cent of the sample period.

L(A)90

In noise monitoring, the noise level which is exceeded for 90 per cent of the sample period—commonly known as the ‘background noise level’.

MHM

materials handling moisture

NEPM

National Environment Protection Measure

NPI

National Pollutant Inventory

PLC

programmable logic controller

PM10

particulate matter less than 10 microns in diameter

PM2.5

particulate matter less than 2.5 microns in diameter

RASS

Radar Acoustic Sounding System

SO2

sulphur dioxide SODAR Sonic Detection and Ranging

TEOM

Tapered Element Oscillating Microbalance

TSP

Total Suspended Particulate Matter

 

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