https://scholars.lib.ntu.edu.tw/handle/123456789/38014
標題: | Dissolved oxygen and nitrate of groundwater in Choshui Fan-Delta, western Taiwan | 作者: | Chen, Wen-Fu Liu, Tsung-Kwei |
關鍵字: | Dissolved oxygen; Fan-delta aquifer; Nitrate; Taiwan | 公開日期: | 2003 | 起(迄)頁: | 731-737 | 來源出版物: | Environmental Geology | 摘要: | Dissolved oxygen (DO) and nitrate concentrations of groundwater from a total of 191 new monitoring wells, with a maximum depth up to 300 m, in the Choshui fan delta of Taiwan were measured to delineate the regional patterns of the two components. Unconfined aquifers of the proximal part of the fan delta contain 1-7 mg/l of DO, and a 250-m deep well still has an unusual value of 1. 83 mg/l. DO concentrations decrease downgradient along flow paths to below detection limit (0.01 mg/l) in shallow confined aquifers during the last 40 years, possibly due to oxidation of organic matters in sediments. A plume of high nitrate-N concentrations (0.5-17 mg/l) originating from the proximal part of the fan delta has been developing, possibly since 1956, due to agricultural fertilizers. From 1997 to 2001, the concentration has increased at a rate of ca. 0.28 mg/l per year. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/172551 | DOI: | 10.1007/s00254-003-0823-0 | SDG/關鍵字: | Aquifers; Fertilizers; Nitrates; Oxygen; Unconfined aquifers; Groundwater; dissolved oxygen; fan delta; fertilizer application; groundwater; nitrate; pollutant transport; runoff; water chemistry; Taiwan |
顯示於: | 地質科學系 |
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