https://scholars.lib.ntu.edu.tw/handle/123456789/85631
標題: | Contamination potential of nitrogen compounds in the heterogeneous aquifers of the Choushui River alluvial fan, Taiwan | 作者: | Jang, Cheng-Shin Liu, Chen-Wuing |
關鍵字: | Nitrate-N;Ammonium-N;Hydraulic conductivity;Uncertainty;Risk;Geostatistical method | 公開日期: | 24-六月-2005 | 出版社: | Taipei:National Taiwan University Dept Mech Engn | 卷: | 135 | 期: | 155 | 起(迄)頁: | - | 來源出版物: | Journal of Contaminant Hydrology 79 (2005) | 摘要: | This study aimed to analyze the contamination potential associated with the reactive transport of nitrate-N and ammonium-N in the Choushui River alluvial fan, Taiwan and to evaluate a risk region in developing a groundwater protection policy in 2021. In this area, an aquifer redox sequence provided a good understanding of the spatial distributions of nitrate-N and ammonium-N and of aerobic and anaerobic environments. Equiprobable hydraulic conductivity (K) fields reproduced by geostatistical methods characterized the spatial uncertainty of contaminant transport in the heterogeneous aquifer. Nitrogen contamination potential fronts for high and low threshold concentrations based on a 95% risk probability were used to assess different levels of risk. The simulated result reveals that the spatial uncertainty of highly heterogeneous K fields governs the contamination potential assessment of the nitrogen compounds along the regional flow directions. The contamination potential of nitrate-N is more uncertain than that for ammonium-N. The high nitrate-N concentrations (R3 mg/L) are prevalent in the aerobic environment. The low concentration nitrate-N plumes (0.5–3 mg/L) gradually migrate to the mid-fan area and to a maximum distance of 15 km from the aerobic region. The nitrate-N plumes pose a potential human health risk in the aerobic and anaerobic environments. The ammonium-N plumes remain stably confined to the distalfan and partial mid-fan areas. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/2006111501254665 | 其他識別: | 246246/2006111501254665 |
顯示於: | 生物環境系統工程學系 |
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