| 英文摘要 |
The Tachiaxi Exposed River Bed Wind-Boren Dust Prevention Project” is first to implement a series of preventive measures such as straw mat and green plant coverings in the exposed rived beds with wind borne dust problems within the Tachiaxi Basin. The second part of the project is to collect and to build a complete database on the previous prevention measures implemented. The third part of the project is to assess the effectiveness of the preventive coverings on the exposed river beds from this project.
The project execution period, began from December 18, 2006, which was the contract initiation date, and ended on March 17, 2008. The project team had covered 33 locations with potential wind-borne dust pollution problems, including 15 river-engineering locations, which encompassed 14 completed locations and 1 construction on-going locations, 18 exposed rived bed locations (including 8 planned or completed locations). For locations with potential wind-borne dust pollution problems or planned locations or preventive covering completed locations, the team had to inspect each locations 20 times per month to document, photograph, and video for future references. A total of 248 inspections were completed. Another total of 144 TSP point were completed.
The origins of wind-borne dust in Tachiaxi Basin came from all sections of the river. The flood control locations, the river dredge and channel locations, and road repair construction locations were the sources of the wind-borne dust in the upper and middle section of the river. The large construction vehicles on the regional Fengchu embankment flood prevention road between Fengyuan City and Shengan Village were responsible for the wind-borne dust problems in the middle and lower section of the river. The exposed river bed around the estuary and the fallow period of the surrounding farmland were responsible for the wind-borne dust problems in the downstream section of the Tachiaxi.
The strong wind, accompanying the northeast monsoon season, carried dust from the exposed river basin, not only worsen the air quality in Taichung County, but also severely affect the quality of life and the health situations of the residents within the area. The Taichung County Environmental Protection Agency had drawn “The Tachiaxi Exposed Rived Bed Wind-Borne Dust Prevention Plan”, in the hope, that through effective preventive measures, adverse effects from the wind-borne dust on the environment can be reduced. Therefore, student groups and environmental volunteers were invited to join forces and completed the covering of the 12 acres of exposed river bed, located 300 meters from the Hofeng Bridge, with straw mat October 20, 2007. And, on May 26, 2007, September 29, 2007, and December 15, 2007, perspectively, in the tail part of Fengchu embankment flood prevention road in Shengan Village (close to the Federal Highway Four), right next to and 200 meters of the Hofeng Bridge, green plant coverings were used to cover a total of 8 acres of exposed river bed in these 3 locations.
By covering the exposed river beds with straw mats, this project can reduce the air pollution caused by the burning of such material, therefore an estimated CO2 emission of 90,192 metric ton can be reduced by the covering the 12 acres of exposed river beds mentioned in this project (every m2 requires 500g of straw mat, therefore 1 acre can reduce CO2 emission o by 7,516 metric ton). TSP reduction equals to 49.68 metric ton per year (According to study conducted by the Environmental Protection Bureau, average exposed land has a TSP reduction coefficient of 0.345 metric ton/ acre). The green plant coverings has a TSP reduction equals to 49.344 metric ton per year (According to study conducted by the Environmental Protection Bureau, average exposed land has a TSP reduction coefficient of 0.514 metric ton/ acre).
Moreover, ”Conference on Wind Borne Dust Control within Taichung County Rivers and its Exposed River Beds related to River Engineering Construction Locations” were held on December 24, 2007. Contractors responsible for river runway construction locations and related authority organizations were invited to discuss how to improve and prevent wind-borne dust problems and harmful environmental effects related to rivers and river engineering or construction locations. Inclusions of environmental preventative measures related to the above issue in the annual maintenance management were also discussed. Pollution prevention plan were also recommended so Environmental Agency can check and assess the effectiveness of such preventive measures.
During the duration of this project, had voluntarily assisted the Taichung County Environmental Agency to issue 16 river runway dust control news releases, resulting in 10 news reports in major newspapers, which totaled 26 coverage. Hopefully, the coverage of wind-borne dust control in the exposed river runway will result in the public’s better understanding of the efforts and the achievement in this area. Also, all the related authority agencies, through media, can understand more about the importance and related rules to the above pollution control.
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