摘要(英) |
ABSTRACT
During the period of Typhoon Jangmi (2008) , EPA Zhanghua stationmeasured PM10 concentration up to 459μg/m3 at 13:00on September 27th2008.
There is a difference between Zhanghua and Xitun where PM10concentration was 258μg/m3.In order to study the pollution source of Zhanghua, this research devotes to the development of the windmodelbackward caculation.
The experiments conducted in this work including grid wind fieldanalysis at Zhanghua station, ideal wind field test and real wind field test.The model simulations were done with the real wind, started at 12:00 on 26 September and ended at 12:00 on 27 September. A series of tests,
were conducted to locate sources of uncertainties in the model calculations.
The backward integration method II, which focuses on spatial sensitivity tests (14 grid, 7grid, 5grid) and time sensitivity tests(1hr,10min). We have conducted tests with model setting of the search area of 5 grids and time-step of one minute;the backward integration method III with time sensitivity tests (1min,30sec)and spatial sensitivity
tests .
The backward integration method III shows most consistent results with the forward integration when a time-step step of 30 seconds, and the spatial search area is 5 grids were used. In the analysis of Zhanghua case, the results from the spatial sensitivity tests and run with other stations backward simulation, suggests that the sorce of high PM10 value of Zhanghua station is locally produced.
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