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題名 | 應用指標克利金法評估雲林地區地下水層砷污染潛勢=Application of Indicator Kriging for Evaluating the Contamination Potential of Arsenic in the Groundwater Aquifer of Yunlin Area |
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作者 | 劉振宇; 張誠信; | 書刊名 | 農業工程學報 |
卷期 | 49:2 2003.06[民92.06] |
頁次 | 頁1-12 |
分類號 | 443.67 |
關鍵詞 | 砷; 污染潛勢; 飲用水水源水質標準; 變異; 指標克利金; As; Contamination potential; Drinking water standard; Variability; Indicator kriging; |
語文 | 中文(Chinese) |
中文摘要 | 雲林沿海地區地下水水質普遍存在高濃度的砷污染,且目前許多地下水井之砷污染已遠超過飲用水水源水質標準,飲用該地區地下水,將嚴重影響人體健康。本研究利用指標克利金法評估雲林地區砷污染超過飲用水源水質標準之發生機率及潛勢,分析砷污染指標變數三維異向變異模式,不僅可以克服觀測資料稀少的問題,而且增加觀測資料垂直方向之相關性,經由連續多門檻值之指標克利金推估,可以多次修正推估機率,有助於建立正確之砷污染潛勢。研究結果顯示雲林地區地下水明顯受到砷污染而超過飲用水水源水質標準之鄉鎮市,主要分佈於西部沿海地區及北港溪流域,其中以口湖鄉的淺層地下水砷污染機率高達0.91最為嚴重。分析明顯受到砷污染地區之地下水深度與污染機率的關係,地表下深度180公尺以內之地下水具有相當顯著砷污染潛勢,不適合供應飲用水水源,深度190公尺以下之地下水砷污染機率較小,但西南部的四個鄉鎮之地下水砷污染機率為第二級,仍不適合作為飲用水水源使用。 |
英文摘要 | The high arsenic (As) concentration commonly exists in the coastal area of Yunlin, Taiwan, and the groundwater quality data obtained from numerous wells indicated that As concentration far exceeds the drinking water standard of As. The As contamination poses a serious threat to the public drinking water sources and human health. In this work, a estimated probability using indicator kriging was adopted to assess the contamination potential that exceeding the drinking water standard of As in the Yunlin area. A three-dimensional (3D) spatial variability model was anisotropically analyzed using indicator variables of multiple thresholds and provided the estimation result of indicator kriging. This 3D estimation is useful for the sparsity and the vertical correlation of measured data. The estimated result reveals that the contamination potential of As significantly appears in the coastal area and the Peikang River basin. The highest probability, 0.91, of the As contamination potential is in the shallow aquifer of the Kouhu. The contamination potential of As mainly presents within a depth of 180 m in the polluted area. The polluted aquifer (<180 m) is not suitable for drinking water supplies. The contamination potential of As is low in the depth below 190 m. However, the As contamination probabilities exceed 0.2 in the deep aquifer of four coastal towns still posing risk to human health. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。