THE DIRTY OF LOUDNESS Investigation on the traffic noise pollution to residents in Western District


By Kenneth Wong (DUPAD, HKU) 2017 ESRI Young Scholar Awards, Grand Award


BACKGROUND


• At the end of 2015, the daily total road travelled by vehicles in Hong Kong had reached a new peak of 36.41 million vehicle perday.


• How bad will the traffic noise be is a concern to public health


• Connaught Road West Flyover is chosen in this project to study the traffic noise generated from this highway.


We would like to:


• Investigate the noise level generated from the traffic in Western District


• Figure out the number of residents living in area exceeding the standard proposed by the governtment


FINDINGS


We produced 24 noise maps revealing the noise level in each hour, and 12 of them are shown below. Areas in dark red are those severely exceeding the standard of 70dB(A), while that of pale red slightly exceeds 70dB(A) (which still exceeds the standard, though).


Then we summarised the noise maps together to how long are the buildings being affected in one day


24hrs


19-23hrs 13-18hrs 7-12hrs 1-6hrs


Not Affected


Distribution of the total affected hours of all 1495 buildings in the investigated area. Around 40% of the buildings are in the "noisy zone" for at least 1 hour.


METHODOLOGY


Traffic noise generated and the noise received by the residents are calculated by the following questions.


L10


(1h)=10×log10 Lcorr


(q)+33×log1010 =-10×log10 Ltotal Lreceived


(d÷13.5)+5.2×1×log10 =L10


=1-×log10 i=1 n


(1h)+Lcorr ∑100.1×Li


(V+40+500÷V))+10×log10 (3÷(d+3.5))


(1+5P÷V)


Right: 3d Visualisation of the total


number og hours the building lies in the affected zone (>70dB(A))


69


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