Pollutant concentrations inside Tate's Cairn Tunnel in Hong Kong and pollutant prediction models

Pao Yue-kong Library Electronic Theses Database

Pollutant concentrations inside Tate's Cairn Tunnel in Hong Kong and pollutant prediction models


Author: Lau, Ming-leong
Title: Pollutant concentrations inside Tate's Cairn Tunnel in Hong Kong and pollutant prediction models
Degree: M.Sc.
Year: 2000
Subject: Pollutants -- China -- Hong Kong
Tunnels -- China -- Hong Kong
Air -- Pollution -- Measurement
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: xvi, 132 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1523536
URI: http://theses.lib.polyu.edu.hk/handle/200/3857
Abstract: The vehicles composition and the pollutant concentrations including Carbon Monoxide (CO), Nitrogen Dioxide (NO2), dust concentration as well as the visibility within Tate's Cairn Tunnel in Hong Kong were investigated. The vehicles composition and figures in the morning rush hour period and the afternoon non rush hour period reflected the general situation of a vehicular tunnel. Portable gases and dust samplers were used in the study to monitor the CO, NO2 concentration and dust level. Visibility was measured by tunnel installed equipment. Samples were taken at the tunnel portal which the highest concentration of pollutants were expected. Tate's Cairn Tunnel is the longest vehicle tunnel in Hong Kong (3945m). The tunnel was designed and built with downward semi-transverse full supply ventilation system. Fresh air was supply to the tunnel to dilute the vehicular emissions within the acceptable level. The ventilation system of the tunnel was found effective in diluting the pollutants from vehicular emissions. The CO concentration, the NO2 concentration and visibility measured in the tunnel were well below the original design standard and the statutory tunnel air quality standard. The measured dust level was low. From the pollutants ratio analysis, it was found that diesel vehicles have higher emission rate on NO2 and particulate than petrol vehicles. A model previously derived to predict the CO concentration for Hong Kong Cross Harbour Tunnel was modified to predict the CO concentration for Tate's Cairn Tunnel. Further modification of the model was conducted to predict the NO2 concentration and dust level. The models were examined and the validation results were satisfactory. It can be used to predict the CO, NO2 and dust concentration in the Tate's Cairn Tunnel.

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