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頁籤選單縮合
題名 | 河道伏流水特性及其對地表逕流水質之影響=The Characteristics of Hyporheic Water and Its Influence on Surface Water Quality |
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作者姓名(中文) | 游志弘; 孫建平; | 書刊名 | 農業工程學報 |
卷期 | 61:2 2015.06[民104.06] |
頁次 | 頁47-60 |
分類號 | 443.67 |
關鍵詞 | 五溝水湧泉濕地; 伏流水; 水質特性; 微測壓管; 通量; Wu Gou Shui spring-fed wetland area; Hyporheic water; Water quality characteristics; Minipiezometer; Flux; |
語文 | 中文(Chinese) |
中文摘要 | 河道伏流水不僅影響溪流中的化學及物理性質,亦可提供水生生物所需的養分,對溪流生態系統的影響深具重要性。本研究地點位於屏東五溝水湧泉濕地,透過微測壓管量測垂直水力梯度,判斷伏流水的上湧及下滲現象;使用微水試驗量測水力傳導度,計算伏流水與地表逕流間交換的單位面積通量;並利用水質儀器測量地表逕流水與伏流水水質。在大尺度下發現興盛橋上游河段大致呈現上湧現象;在小尺度下則由於局部區域河床底質顆粒較粗,因重力效應及滲透性佳使得下滲現象明顯。藉由獨立T檢定顯示上湧及下滲處之水質無明顯的差異性,因地表逕流流動快,故於上湧及下滲處水質特性較接近,以及伏流水於上湧及下滲處水質特性因滲透層特性相似而無差異性。透過多元尺度方法及主成分分析方法分析地表逕流水質特性,區分出上湧及下滲處,研究成果可供管理人員藉由水質特性判斷上湧或下滲的出現位置,在河道伏流水的使用上有更多的考量依據。 |
英文摘要 | The effect of hyporheic water on wetland ecological habitat is important. The hyporheic processes not only impact physical and chemical characteristics of water but also provide needs to organisms in stream ecosystems. The exchange between surface water and hyporheic water was quantified by measuring the vertical hydraulic gradient (VHG) and streambed hydraulic conductivity (K) in minipiezometers by using the slug test in Wu Gou Shui spring-fed wetland area. Physical and chemical characteristics of the surface water and hyporheic water were measured and analyzed. Most upwelling sites were observed in the upper reach at Xing Sheng Bridge. On a small scale, few downwelling sites contained large sediment in the streambed. The magnitude of downwelling sites was significantly higher than the magnitude of upwelling sites because of gravity and good permeability. Some neutral sites were observed with frequent interactions between surface water and hyporheic water in small areas. There were no differences in water quality characteristics of surface water and hyporheic water between upwelling sites and downwelling sites. By using multidimensional scaling analysis (MDS) and principal component analysis (PCA), we could distinguish upwelling and downwelling sites and find the main factors of water quality characteristics by analyzing water quality characteristics of surface water. |
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