WEEK 3
Noise Monitoring
Date: 7/12/2016
Time: 16:01:17
|
MEASUREMENT
|
|||
|
DATE: 7th DECEMBER 2016
|
TIME: 4.01 PM
|
||
|
MEASUREMENT
TIME INTERVAL: 1 HOUR
|
|||
|
EQUIPMENT
|
|||
|
SOUND
LEVEL METER
MODEL:
EXTECH INSTRUMENT
SERIAL
NO: 150105006
|
|||
|
WEATHER CONDITION
|
|||
|
WEATHER
EQUIPMENT SERIAL NO: SM 15413297
PRESSURE
(Pa): 1016 hPa
|
PRECIPITATION:
RAINING/DRIZZLE
|
||
|
CLOUD
COVER: CLEAR/SCATTERED CLOUD/PARTLY CLOUD/MOSTLY CLOUD/OVERCAST
|
|||
|
AVERAGE
WIND SPEED: 1 kph
TEMPERATURE:
35˚C
|
HUMIDITY
(%): 77%
|
||
|
DESCRIPTION AND OPERATING CONDITION OF THE SOUND
SOURCE
|
|||
|
LOCATION
OF SITE: ROUND ABOUT ALOR GAJAH
|
|||
|
DESCRIPTION
OF SITE: THE ROUND ABOUT IS LOCATED AT THE CENTER OF ALOR GAJAH TOWN.
|
|||
|
BUILDING
GEOMETRY: OPEN AREA
|
|||
|
GROUND
COVER & CONDITION: ON THE BRICKS
|
|||
|
PARAMETERS
|
|||
|
HEIGHT
OF MICROPHONE (Hr): 1.2 m
|
HEIGHT
OF SOURCE (Hs): 1.5 m
|
||
|
DISTANCE
BETWEEN SOURCE AND MICROPHONE (r): 2.5 m
|
|||
|
ROAD TRAFFIC
|
|||
|
# OF
HEAVY VEHICLES (>3500KG)
(Min
30): 34
|
# OF
LIGHT VEHICLES
(Min
30): 770
|
AVERAGE
SPEED: 60 km/h
|
|
As usual, we came right on time and without hesitation, we handled the assessment like we did before. We started at 16:01:17 and finished at 17:01:16, completed 1 hour session of noise monitoring successfully. Below are the results that we have recorded and obtained on that day.
Discussion
Overview
Above are the value of noise
level that are taken during 1 hour period of time:
Firstly, L10 is the noise level
exceeded for 10% of the time of the measurement duration. This is often used to
give an indication of the upper limit of fluctuating noise, such as that from
road traffic. So for the 3rd week, the value of L10 is 74.4 dB.
Compared to the second week, it increased by 0.4 dB. Then for L50, it is the
noise level exceeded for 50% of the measurement duration. Therefore the value
of L50 is 67.4 dB. The value stays the same. Next, the L90 is the noise level
that is taken to be the ambient or background noise in the road traffic. The
value of L90 is 62.5 dB. Compared to the second week, it remains unchanged. Futhermore,
the value of Max dB for this particular week 91.5 dB. This is because there
were not many heavy vehicles were passing by on the road traffic. In addition, Leq
is the Sound Pressure Level in dB, time-averaged level and is equivalent to the
total Sound Energy over a 1 hour period of time on the road traffic. The value
of Leq is 70 dB for the third week.
No comments:
Post a Comment