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題名 | 花蓮縣吉安溪RPI及關聯水質參數機率分佈及警戒值研析=Evaluation of the Warning Value and Probability Distribution Function of RPI Value and Related Parameter of Ji-An River Water Quality in Hualilen County |
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作 者 | 江漢全; 高育琦; 戴文堅; 王御安; 王志惠; | 書刊名 | 宜蘭大學工程學刊 |
卷期 | 9 2013.12[民102.12] |
頁次 | 頁50-68 |
分類號 | 445.213 |
關鍵詞 | 河川污染指數; River pollution index; Spearman相關分析; Monte Carlo 模擬; 吉安溪; RPI; Spearman's rank correlation; Monte Carlo simulation analysis; Ji-An river; |
語文 | 中文(Chinese) |
中文摘要 | 河川污染指數(River pollution index, RPI)是台灣地區河川污染狀況評估應用最廣泛的指標之一,其中有四個參數分別是溶氧(DO)、生化需氧量(BOD)、懸浮固體(SS)及氨氮(NH3-N)等,經計算後得RPI 指數,再將水質依RPI 之值進行污染程度分類,普遍應用於河川流域之水質規劃與管理。本研究利用行政院環保署吉安溪之水質監測資料,依太昌橋測站(上游)及仁里橋測站(下游),統計花蓮地區2002~2010年每個月的資料,兩個測站共計216筆,再以豐、枯水期及上、下游之BOD、NH_3-N、DO、SS及RPI之值,分別先採用Spearman相關性分析,了解其間之相關特性,再將河川測站資料進行蒙地卡羅(Monte Carlo)模擬,決定原始數據的機率分佈函數,並繪製累積機率分佈函數曲線,獲得BOD、NH_3-N、DO、SS及RPI值所對應之各機率百分數,據以評析造成該河川污染的主要污染物質,並提出警戒值,供主管機關進行污染防治之參考。研究結果顯示,吉安溪流域於2002-2010年間,經由Spearman相關分析顯示,在上游測站時BOD升高對RPI之增加具有極顯著相關性,且BOD升高時,氨氮亦隨之升高;然而,下游測站則有BOD、NH_3-N和SS三個參數與RPI皆有極顯著的相關性。以蒙地卡羅模擬花蓮縣吉安溪近9年豐、枯水期之結果顯示,此河川兩測站的RPI及其副指標在豐、枯水期差別並不明顯,建議使用上、下游來分別訂定污染稽查時之警戒值,以累積機率70 %為基準,其警戒值在上游測站之RPI和BOD之值為2.04、2.17 mg/L,下游測站RPI、BOD、NH_3-N和SS分別是2.31、3.20 mg/L、0.50 mg/L和50.59 mg/L。 |
英文摘要 | The RPI (River pollution index) is one of the indicators that is extensively applied to the assessment on river water quality in Taiwan. The RPI involves four parameters: DO, BOD, SS, and NH_3-N, the overall index is then divided into pollution levels. The proposed indicator is commonly used in water quality planning and management. This study is investigating the probability distribution function of RPI value and related parameters on Ji-An River, Hualien County, Taiwan. First, the water quality data were collected from the Environmental Protection Administration (Taiwan) monthly in 2002-2010 from two water quality monitoring stations on Ji-An river, the Tai-Chang Bridge (upstream), and the Ren-Li Bridge (downstream). Total numbers of 216 RPI data were collected. Then applied the Spearman's correlation analysis to the BOD、NH_3-N、DO、SS, and RPI of upstream and downstream in the wet period and dry period to obtain the correlation between each two items. Next, we discovered the probability distribution function and cumulative probability distribution curve of the four parameters and RPI by Monte Carlo simulation analysis. Finally, the main pollutants and the warning value for the water quality monitoring stations on Ji-An river were determined, as a reference to competent authorities in pollution prevention. After applying the Spearman's correlation analysis to the Ji-An River basin from 2002 to 2010, the result showed that the increased of BOD was significant positively related to RPI, and increased of BOD was extremely significant positively related to NH_3-N at upstream monitoring station. However, BOD, NH_3-N, and SS were extremely significant positively related to RPI at downstream monitoring station. As a result, it has not shown significant differences between wet period and dry period on all water quality parameters. Therefore, we suggested that setting warning value for different water quality parameters by monitoring station basis (upstream or downstream). In this study, based on the cumulative probability 70%, the warning values of RPI and BOD for upstream monitoring station of the Ji-An river are 2.04 and 2.17 mg/L, respectively. On the other hand, the warning values of RPI, BOD, NH_3-N, and SS for downstream monitoring station are 2.31, 3.20 mg/L, 0.50 mg/L and 50.59 mg/L, respectively. |
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