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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 劉雅瑄 | zh_TW |
| dc.contributor.advisor | Ya-Hsuan Liou | en |
| dc.contributor.author | 陳姵妏 | zh_TW |
| dc.contributor.author | Pei-Wen Chen | en |
| dc.date.accessioned | 2024-12-24T16:14:58Z | - |
| dc.date.available | 2024-12-25 | - |
| dc.date.copyright | 2024-12-24 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-12-16 | - |
| dc.identifier.citation | Alorda-Kleinglass, A., Rodellas, V., Diego-Feliu, M., Marbà, N., Morell, C., & Garcia-Orellana, J. (2024). The connection between Submarine Groundwater Discharge and seawater quality: The threat of treated wastewater injected into coastal aquifers. Science of The Total Environment, 922, 170940. https://doi.org/https://doi.org/10.1016/j.scitotenv.2024.170940
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/96302 | - |
| dc.description.abstract | 本研究聚焦於探討台灣東部海底地下水滲流(Submarine Groundwater Discharge, SGD)的動態及其機制，分析其與區域地質和氣候條件之間的關聯，並估算淡水海底地下水滲流(Submarine Fresh Groundwater Discharge, SFGD)的通量。研究區域的地質背景以花崗岩、片麻岩及大理岩為主，具有高透水性及發達裂隙系統，有助於地下水快速流動，通過文獻回顧與數據分析，結合多種測量和計算方法，系統探討變質岩區域地下水滲流的特徵。為了更深入了解這些變化，將2024年第二季的數據作為地震後的樣本進行單獨分析，並將其他季節之數據比較乾季和濕季之間的滲流通量和流速變化。
研究數據顯示，台灣東岸地質導致滲流通量高於其他地區，破裂帶的存在進一步促進了地下水滲流，尤其是B-02井的鐳同位素(如ex224Ra)數據顯示該地區淡水滲流活動旺盛。乾季期間，鐳同位素活性顯著升高，反映出乾季地下水補注的增加。其SFGD之估算滲流通量範圍為3.93×10-1 - 8.23×10-1 m·d-1，平均值為 0.90 m·d-1，並藉由達西定律後可計算出水力傳導係數約為5.55×10-5 - 1.16×10-4 m·s-1符合現地調查及前人文獻。滲流活動在乾濕季節及地震前後均呈現顯著差異。地震前乾季的滲流通量與流速普遍高於濕季2022(Q4)與2023(Q1)的乾季滲流通量分別達454和489 dpm·m⁻²·day⁻¹，顯著高於2022(Q3)濕季之53.8 dpm·m⁻²·day⁻¹；兩個地下水井(Site-#1、Site-#2)亦呈現類似趨勢，乾季滲流通量明顯高於濕季，這反映了乾季水力條件對地下水滲流的增強作用；流速方面，SFGD之乾季流速(2022(Q4))的0.789 m·day⁻¹亦高於濕季(2022(Q3))的0.393 m·day⁻¹，說明降水減少及水力梯度變化可能加強了地下水的滲流速度。然而，地震後2024(Q2)之滲流活動達到歷史高峰，SFGD和Site-#1的滲流通量顯著增加，分別達804和923 dpm·m⁻²·day⁻¹，超越地震前乾濕季之數據；流速亦提升至0.823 m·day⁻¹；相較之下，Site-#2的滲流通量卻略有下降，維持濕季之變化趨勢，研究指出地質條件是影響滲流的重要因素。 這些地質與水文特徵強調了地震可能加劇地下結構破裂及水力梯度調整，進一步影響滲流模式。結合分析，本研究展示了季節性變化和地震對地下水滲流動態的顯著影響，為進一步理解台灣東部變質岩區域淡水海底地下水動態的特徵，也顯示出天然示蹤劑法和多方法綜合應用在滲流研究中的潛力，對未來的環境監測和資源管理具有重要意義。 | zh_TW |
| dc.description.abstract | This study focuses on exploring the dynamics and mechanisms of submarine groundwater discharge (SGD) in eastern Taiwan, analyzing its relationship with regional geological and climatic conditions, and estimating the flux of submarine fresh groundwater discharge (SFGD). The geological background of the study area is dominated by granite, gneiss, and marble, characterized by high permeability and well-developed fracture systems that facilitate rapid groundwater flow. Through literature review and data analysis, combined with various measurement and calculation methods, the characteristics of groundwater discharge in the metamorphic rock regions were systematically investigated. To gain deeper insights into these variations, data from 2024 (Q2) were analyzed separately as post-earthquake samples, and seasonal data were compared to examine the differences in discharge flux and flow rates between the dry and wet seasons.
Research data reveal that the geology of Taiwan's east coast results in higher discharge flux compared to other regions, with fault zones further enhancing groundwater discharge. Radium isotope measurements, particularly from well B-02 (e.g., ex224Ra), indicate active freshwater discharge in the area. The estimated SFGD flow rates ranges from 3.93×10⁻¹ to 8.23×10⁻¹ m·d⁻¹, averaging 0.90 m·d⁻¹, and the hydraulic conductivity calculated via Darcy's Law is approximately 5.55×10⁻⁵ to 1.16×10⁻⁴ m·s⁻¹, consistent with field observations and previous studies. Prior to the earthquake, dry season discharge flux and velocity were generally higher than in the wet season, with dry season discharge flux reaching 454 and 489 dpm·m⁻²·day⁻¹ in 2022(Q4) and 2023(Q1), significantly exceeding the 53.8 dpm·m⁻²·day⁻¹ recorded in the wet season. A similar trend was observed in the two groundwater wells (Site-#1 and Site-#2), where dry season discharge flux was markedly higher than in the wet season. Post-earthquake discharge activity in 2024(Q2) reached a peak, with SFGD and Site-#1 discharge flux increasing to 804 and 923 dpm·m⁻²·day⁻¹, surpassing all pre-earthquake seasonal data. These geological and hydrological characteristics highlight the potential for earthquakes to exacerbate subsurface structural fractures and adjust hydraulic gradients, further impacting discharge patterns. By integrating these analyses, this study demonstrates the significant influence of seasonal variations and earthquakes on groundwater discharge. It provides a deeper understanding of the characteristics of SFGD in the metamorphic rock regions of eastern Taiwan and showcases the potential of natural tracer methods and multi-method approaches in discharge studies. The findings are of critical importance for future environmental monitoring and resource management. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-12-24T16:14:58Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-12-24T16:14:58Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 誌謝 i
摘要 ii Abstract iii 目次 iv 圖次 viii 表次 xi 第一章 緒論 1 1.1 研究架構 2 第二章 文獻回顧 3 2.1 研究區域背景 3 2.1.1 地理位置與地形 3 2.1.2 地質背景 5 2.1.3 氣候型態 7 2.2 海底地下水滲流 9 2.2.1 直接測量 11 2.2.2 水文地質模型法 13 2.2.3 天然示蹤劑法 14 2.3 鐳同位素化學示蹤劑法 15 第三章 採樣及分析方法 18 3.1 現地採樣方法 18 3.2 水質分析方法 21 3.2.1 碳酸氫根分析 22 3.2.2 感耦合電漿體原子發射光譜儀 24 3.2.3 感應耦合電漿質譜儀分析 25 3.2.4 離子層析儀 26 3.2.5 穩定氫氧同位素 28 3.2.6 同步延遲計數器 29 3.3 數據分析方法 33 3.3.1 採樣數據篩選 33 3.3.2 水質數據分析 33 3.3.3 鐳同位素數據分析 36 3.4 海底地下水滲流計算 37 第四章 結果與討論 39 4.1 基本水質採樣數據分析 39 4.2 主要陰陽離子數據分析 46 4.3 微量元素數據分析 54 4.4 鐳同位素水質數據分析結果 61 4.5 海底地下水滲流通量 63 4.5.1 估算變因篩選 63 4.5.2 淡水海底地下水通量計算 68 4.6 淡水海底地下水滲流通量季節性評估 75 第五章 結論與建議 78 5.1 結論 78 5.2 建議 80 參考文獻 81 附錄 一 2022(Q2)濕季之水質採樣基本數據及離子分析數據 92 附錄 二 2022(Q3)濕季之水質採樣基本數據及離子分析數據 93 附錄 三2022(Q3)濕季之水質採樣基本數據及離子分析數據–續 94 附錄 四 2022(Q4)乾季之水質採樣基本數據及離子分析數據 95 附錄 五2022(Q4)乾季之水質採樣基本數據及離子分析數據-續 96 附錄 六 2023(Q1)乾季之水質採樣基本數據及離子分析數據 97 附錄 七 2023(Q1)乾季之水質採樣基本數據及離子分析數據-續 98 附錄 八 2023(Q2)濕季之水質採樣基本數據及離子分析數據 99 附錄 九 2024(Q1)乾季之水質採樣基本數據及離子分析數據 100 附錄 十 2024(Q1)乾季之水質採樣基本數據及離子分析數據-續 101 附錄 十一 2024(Q2)濕季之水質採樣基本數據及離子分析數據 102 附錄 十二 2024(Q2)濕季之水質採樣基本數據及離子分析數據-續 103 附錄 十三 2022(Q2)濕季之微量元素分析數據 104 附錄 十四 2022(Q3)濕季之微量元素分析數據 105 附錄 十五 2022(Q3)濕季之微量元素分析數據-續 106 附錄 十六 2022(Q4)乾季之微量元素分析數據 107 附錄 十七 2022(Q4)乾季之微量元素分析數據-續 108 附錄 十八 2023(Q1)乾季之微量元素分析數據 109 附錄 十九 2023(Q1)乾季之微量元素分析數據-續 110 附錄 二十 2023(Q2)濕季之微量元素分析數據 111 附錄 二十一 2023(Q2)濕季之微量元素分析數據-續 112 附錄 二十二 2024(Q1)乾季之微量元素分析數據 113 附錄 二十三 2024(Q1)乾季之微量元素分析數據-續 114 附錄 二十四 2024(Q2)濕季之微量元素分析數據 115 附錄 二十五 2024(Q2)濕季之微量元素分析數據-續 116 附錄 二十六 2022(Q2)濕季之鐳同位素採樣數據 117 附錄 二十七 2022(Q3)濕季之鐳同位素採樣數據 118 附錄 二十八 2022(Q4)乾季之鐳同位素採樣數據 119 附錄 二十九 2022(Q4)乾季之鐳同位素採樣數據-續 120 附錄 三十 2023(Q1)乾季之鐳同位素採樣數據 121 附錄 三十一 2023(Q2)濕季之鐳同位素採樣數據 122 附錄 三十二 2024(Q1)乾季之鐳同位素採樣數據 123 附錄 三十三 2024(Q2)濕季之鐳同位素採樣數據 124 附錄 三十四 2022至2024各季氫氧同位素採樣數據 125 附錄 三十五 2022至2024各季氫氧同位素採樣數據-續 126 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 鐳同位素 | zh_TW |
| dc.subject | 海底地下水 | zh_TW |
| dc.subject | 放射性同位素示蹤法 | zh_TW |
| dc.subject | submarine fresh groundwater discharge | en |
| dc.subject | radium | en |
| dc.subject | radioisotope tracer method | en |
| dc.title | 以天然放射性同位素探討台灣東部海底地下水滲流之研究 | zh_TW |
| dc.title | Using natural radioactive isotopes to explore coastal submarine groundwater discharge | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 邱永嘉;楊汶達 | zh_TW |
| dc.contributor.oralexamcommittee | Yung-Chia Chiu;Wen-Ta Yang | en |
| dc.subject.keyword | 海底地下水,鐳同位素,放射性同位素示蹤法, | zh_TW |
| dc.subject.keyword | submarine fresh groundwater discharge,radium,radioisotope tracer method, | en |
| dc.relation.page | 126 | - |
| dc.identifier.doi | 10.6342/NTU202404703 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2024-12-16 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 地質科學系 | - |
| 顯示於系所單位： | 地質科學系 | |
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