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題名 | 哈盆溪集水區伏流水動態研究(4)=The Potential Subsurface Flow at Ha-Pen Watershed (Ⅵ) |
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作者 | 陳信雄; 楊蔚宇; 張振生; | 書刊名 | 國立臺灣大學農學院實驗林研究報告 |
卷期 | 13:4=226 1999.12[民88.12] |
頁次 | 頁279-294 |
分類號 | 436.19 |
關鍵詞 | 集水區; 地下水; 食鹽水檢層; 流速檢測; 伏流水; Watershed; Groundwater; Groundwater logging; Velocity test; Subsurface flow; |
語文 | 中文(Chinese) |
中文摘要 | 福山哈盆集水區伏流水動層次大致介於4~10m之間,而較深層地下水多在地表下20m以下地層。礫石層為伏流水主要流動地層。一般情形下,水位井水位面非真正之地下水面,伏流水亦非成層流動,對於伏流水合理的描述,較近於複雜的立體網狀流脈結構,而流脈間的流通則受集水區濕潤狀態的影響。由流速檢測結果顯示,水位井如同一「漏管」,井內水並非全深度的水平向等速流動,而是具有特殊的水平流動層次;又水位井所在地層,因缺乏堅實的不透水層底部,其垂直流速亦相當可觀。對降雨期間伏流水的水質檢測結果顯示,陽離子除於降雨初期受到短暫稀釋外,降雨期間均呈昇高趨勢。陰離子如SO4-2、PO4-3在降雨期間,其濃度呈下降趨勢,而C1-,則呈緩昇的趨勢。 |
英文摘要 | The subsurface flow (subsurface runoff) of the Ha-Pen Watershed ranges from 4-10m below the ground surface, whereas the deeper unconfined aquifer is about 20m below the ground. The subsurface runoff flows mainly in the gravel layer. In general, the water level in the well is not the true groundwater table, and the groundwater dose not move in the manner of layers. The movement of groundwater is of a 3-D network structure that is influenced by on wet conditions of the watershed. According to the velocity tests, the well was like a leaking shaft in which the water was not moving uniformly along the vertical direction. Due to the lack of impermeable stratum below the wells, the vertical velocity of flow was significant. Analyses of the groundwater quality during the rainfall period showed that the concentration of cations increased except at the beginning of rainfall. As to the concentration of anions, it was found that durning the rainfall period SO4-2 and PO4-3 decreased and C1- increased. |
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