| Summary: | 碩士 === 逢甲大學 === 環境工程與科學所 === 95 === Nantou County is famous for her many wonderful scenery. In case the
transportation system is well connected, a lot of tourists will come in great
numbers. However, crowded visitor will also bring pollution to the environment.
That’s why decision-making of any public work should be very careful.
This study undergoes three times of simultaneous vehicle-counting at six
selected positions in the main traffic lines in Nantou County. The change of
traffic-line patterns before and after the construction of Formosan Freeway was
studied. Then a numerical model was utilized to simulate their effect on air
quality around the main traffic line regions. Finally, evaluations of deterioration
of air quality due to the construction of Formosan Freeway were proceeded.
The result show that, Total Travel Index （TTI）values in weekdays,
weekends, and multiple-day holidays of the traffic in and out of Nantou County
were 1.2, 1.4 and 1.8, respectively. It was realized that the Formosan Freeway
did attract a large number of vehicles on weekend, especial on multiple-day
holidays. On the other hand, TTI values of the NO.3 highway was only 0.3 in
each cases of weekdays, weekends and multiple-day holidays. It revealed that
the traffic on NO.3 highway was greatly reduced owing to the appearance of
Formosan Freeway. It also indicates that almost all of the long-distance traffic
has transferred to Formosan Freeway.
According to the numerical simulations the worst situation arose when
NNE wind direction predominant. The highest concentration was found near
regions of Tsautun, Nantou city and Suangdong. For air pollutant CO, the Air
Pollution Index（API）value was less than 1 at weekdays and was a little larger
than 1 at holidays. For NMHC, most of the API value was smaller than 1.
However, all of the API values for NOx and SO2 were decrease and NOx and
iv 逢甲大學e-Thesys(95 學年度)
SO2 increase due to the construction on Formosan Freeway and hence the
traffic-line pattern change.
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