| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 94 === After earthquake 921 and typhoon Tao-tz, Nantou County’s main rivers began gradually to dredge and sell gravel. Since 2001 to 2005, there were 100 times of dredging to be done and yielded gravel up to 23927688 cubic meters. If these gravel transported by 3.5-ton gravel truck, it needs 1.71 million times to finish the work. In this condition, there will be 28500 gravel trucks shuttling on Nantou County’s main roads. Under such large amount of gravel dredging and selling, in addition to emission lots of particulates caused by the procession of mining and washing gravel, there are lots of falling gravel, driving dust, exhaust gas caused by thousands of gravel trucks shuttling on the county’s roads forming the most resources of pollutants daily that impact the air quality and damage people health.
This research according to an academic institution’s study result concerning about monitoring TSP and total amount of gravel trucks on gravel dredge as well as its transporting during 2003 to 2005 that commissioned by the Environmental Protection Bureau of Nantou County, using Excel for statistic method to get both Line’s equation and Index’s equation, and put relative regulations standard value of TSP (such as the emission standard of particulates in the emission standard of fixed air pollutant resources, etc.) into the equations in order to pre-analyze the total amount of transporting gravel trucks per hour or each day, and feasibility assessment to establish total amount control of gravel trucks reducing the impact of transporting gravel trucks again the air quality.
Among all prediction equations, the Gin-Siang Garage ＆ Long-Cheng Temple monitor station located on road 16 in 2004 is the most representative. This station not only has the most monitoring spots (up to 68 spots), situated in the most suitable site (every gravel truck must pass by this site), but also their initial concentration(intercept) approach the monitor background value of TSP in this site. Besides, Index’s curve is more reasonable, so that adopt Index’s curve is better than adopt Line’s curve to predict the total amount of transporting gravel trucks.
Analyzing monitor data from the mentioned representative spots, when concentration of suspension particulates reach the limit value of announcing a warning for emergency deterioration of air quality to forbid or confine the use of transportation tools; the maximum total amount of gravel trucks driving in Nantou County is 5000 vehicles each day. That is not more than 2500 gravel trucks driving in the same direction into Nantou County each day. In other words, there are 2500 gravel trucks can be allowed driving in the same direction into Nantou County for transporting gravel each day only.
Finally through this research, we can draw relative accessory regulations for total amount control of gravel trucks offering the authorities for references.
|
|---|
