Using FDM to Estimate the PM10 at Jhuoshuei River Estuary
揚塵 ； FDM ； 濁水溪 ； fugitive dust ； Fugitive Dust Model ； Jhuoshuei River
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本研究係應用FDM (Fugitive Dust Model)模式，進行濁水溪河口之揚塵模擬，為配合現地資料做驗證，選定模擬範圍為濁水溪自強大橋至西螺大橋河段，並勘選臨近之崙背、二林及斗六氣象測候站，進行氣象資料之模擬與比對，再將模擬值以ArcGIS處理後繪圖判讀。 先選定執行FDM模式之模擬測試6種參數：受體點間距、排放高度、受點高度、混合層高度、穩定度及氣溫，在不同情況下；再以氣象資料則採用98年間不同季節之風速、風向、穩定度、混合層高度及氣溫等資料進行測試，獲致結果。 FDM為擴散模式之演算結果，不受點間距設定之影響；排放高度以20 m以下所得結果較為精準，受點高度在5 m以下揚塵濃度差異不大，5 m以上隨高度遞增而遞減；混合層高度在200 m以上，對模擬結果影響甚小；穩定度等級隨揚塵濃度增加之趨勢；氣溫上升有使揚塵濃度呈現下降趨勢。 氣象資料測試結果，首先以濁水溪現地資料從事驗證，進而獲得模式所需之修正係數，據此進行其他模擬；其次以氣象站資料模擬比對，模擬值與崙背測站最為接近，準確度達70%；在不同季節模擬結果方面，春、秋及冬季以崙背測站所得結果較佳，而夏季則以二林測站較為理想，此外，濁水溪附近西北風向甚少，故斗六測站之氣象資料不適合此區模擬。
This study Applied FDM (Fugitive Dust Model) to simulate the condition at Jhuoshuei River estuary. The experimental section of Jhuoshuei River from Ziqiang Bridge to Xiluo Bridge were selected as the scope of simulation to testify the data gather on site. The nearby Lunbei, Erlin and Douliou Meteorology Stations were selected for simulating and comparing meteorological data before plotting and deciding based on the simulation values that were treated by ArcGIS. The appropriate parameters and weather data should be inputted required to verify FDM. The six parameters included as, spacing between receptors, height of emission, receptor height, height of mixed layer, stability and air temperature were tested in different conditions them. For meteorological data, the wind speeds, wind directions, stability, mixed layer heights and temperatures of the seasons in 2009 were used. According to the parameter test results, the spacing between receptors did not affect the simulation, because FDM is an algorithm of dispersion model. The results obtained with the height less than 20 m were more accurate; the density of fugitive dust did not differ much when the receptor was below 5 m and decreased with the increase of height when the receptor was above 5 m. A mixed layer higher than 200 m scarcely affected the simulation results. The density of fugitive dust increased with the degree of stability and dropped linearly with the rise of termperature. The test results of meteorological data were tested with the on-site data in Jhuoshuei River to obtain the correctional coefficients that were required, whereby to conduct other simulations. As a result of simulation and comparison of the meteorological data, the simulated values were closest to those at Lunbei station with accuracy as high as 70%. In respect to the simulation results of different seasons, the results at Lunbei Station were better for the seasons of spring, autumn and winter. In addition, as the northwestern wind is scarce around the Jhuoshuei River, the weather data at Douliou Station were not suitable for the simulation of this region.
生物農學 > 生物環境與多樣性