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標題: 風場軌跡模式參數決定對空品模式模擬最佳化之研究
Trajectory parameter identification for optimizing air quality simulation
作者: 許家綸
Hsu, Chia-Lun
關鍵字: GTx
weighting coefficient
出版社: 環境工程學系所
引用: Allwine, K.J. and L.P. Prahm,1982:Evaluation of the profile methond for estimation of surface fluxes of momentum and heat. Atmospheric Environment,16, 2809-2819 Anlauf, K. G., Mickle, R. E. and Trivett, N. B. A., 1994. Measurement of ozone during Polar Sunrise Experiment 1992. J. Geophys. Res. 99(D12), 25345-25353. Cabezudo B., Recio M.,Sanchez-Laulhe J. M., Trigo M. D. M., Toro F. J. and Polvorinos F., 1997, Atmospheric Transport of Marihuana Pollen from North Africa to the Southwest of Europe, Atmospheric Environment, Vol.33, pp.3323-3328. Chiapello I., Bergametti G., Chatnet B., Bousquet P., Dulac F. and Soares E. S., 1997, Origins of African Dust Transport over the Northeastern Tropical Atlantic, Journal of Geophysical Research, Vol.102, pp.13701-13709. Chen, C.-L., Tsuang, B.-J., Pan, R.-C., Tu, C.-Y. , Liu, J.-H., Huang, P.-L. , Bai, H-L, and Cheng, M.-T., 2002a. Quantification on Source/Receptor relationship of Primary Pollutants and Secondary Aerosols from Ground sources - Part II. Model Description and Case Study, Atmos. Environ. 36(3), pp.421-434. Chen, C.-L., Tsuang, B.-J., Tu, C.-Y., Cheng, W.-L. and Lin, M.-D., 2002b: Wintertime Vertical Profiles of Air Pollutants over a Suburban in Central Taiwan, Atmos. Environ. (NSC 89-EPA-Z-005-004-) (SCI, in press, impact factor: 2.00) Dingenen R. V., Raes F. and Jensen N. R., 1995, Evidence for Anthropogenic Impact on Number Concentration and Sulfate Content of Cloud-Processed Aerosol Particles over the North Atlantic, Journal of Geophysical Research, Vol.100, pp.21057-21067. G
摘要: 中部地區近年來臭氧、懸浮微粒高污染事件日有逐漸增加的趨勢,這可能是由於人為污染源的排放增加,亦可能是受到各種氣象因子的影響,以致於污染物擴散不易,而造成高污染事件日。國內常運用空品模式、氣象模式及高斯煙流軌跡模式(如GTx),並配合氣象資料,來模擬區域之氣象場、受體點之逆軌跡路徑、污染源之順軌跡路徑及污染物之軌跡濃度等。以此分析探討形成污染物之來源、污染物之變化趨勢及區域性累積濃度對周界地區的影響。 郭(2003)於軌跡模擬中加入了以繫留探空氣球所量測得之垂直剖面氣象資料,用以改善地面測站無法有效地呈現出位於煙流高度之溫度風分量,並藉此來改善軌跡模擬在中部山區模擬結果不佳之缺點。嚴(2004)利用氣象局所作之近地表氣象場模擬(NFS)輸出做為GTx前處理之風場軌跡模式(traj)的輸入檔之一,彌補探空之資料之不足,期使模擬結果更加合理化。 雖然探空資料的加入可以有效改善模擬結果,但其取得不易,且非連續性的資料。故GTx之模擬仍主要是以地面測站所量測得之風場資料來進行計算。並考慮到測站分佈不均,地面測站和模擬軌跡的高度差,地形的影響,軌跡型式與高度等因素,本研究利用二進位遺傳演算法解模式之角度權重Ca、高度權重Ch、探空資料延時值Ct、臨界福祿數Frc……等參數,並搭配不同之軌跡型式與高度,以得到最能改善軌跡模擬的最佳組合。當Ca =0.93、Ch =26.32、Ct =15000、Frc =2、軌跡移動型式會受到垂直風速風向影響、軌跡高度295M時,可以得到較好的模擬結果。
In recent years, the event days of high concentration in ozone and suspend particle have gradually increased in central Taiwan area, this may due to a great amount of discharge from man-made pollution sources, or the influence of various meteorological factors. It generally used air quality models, meteorology models and Gaussian Trajectory transfer-coefficient model (GTx) cooperating with the meteorological data to simulate the meteorological phenomena and the trajectory of pollutant to investigate the origins of pollutants, the variations of pollutants, and the effect to the neighbor area of the accumulated concentration. Some researchers reported that using sonde data in modifying wind's profile has greatly improved the results of trajectory simulations. Also, using the outputs of Nonhydrostatic Forecast System (NFS) by CWB as the inputs for Trajectory model is a good way to make simulation results more reasonable. However, the sonde data are not continuous and are difficult to obtain. Therefore, GTx model use the data measured from surface stations as it's major parameter for simulation. In addition, it also considers the suneven features on station's spatial distribution, the height variation between trajectory and station, the effects of terrain, and the type of trajectory routes in simulating. This study attempts to use Binary coding Genetic Algorithms (BGA) to obtain optimum coefficients of angle weighting (Ca), height weighting (Ch), time lag weighting (Ct), critical Froude number (Frc), type of trajectory route, and trajectory height. These results suggest that a better simulation performance could be achieved while Ca equals 0.933, Ch equals 26.32, Ct equals 15000, Frc equals 2, type of trajectory route equals z2 (the trajectory which was influenced by vertical wind), and trajectory height is 295M.
其他識別: U0005-0502200715450300
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