| 研究生: |
李欣珮 Lee, Hsin-Pei |
|---|---|
| 論文名稱: |
氣候與圍岩差異對台灣三個河源上游化學風化的影響 Climate and ambient rock influence upon riverine chemical weathering of three headwater tributaries in Taiwan |
| 指導教授: |
游鎮烽
You, Jhen-fong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 101 |
| 中文關鍵詞: | 矽酸鹽風化速率 、河源上游支流 、化學風化 |
| 外文關鍵詞: | silicate weathering rate, headwater tributaries, chemical weathering |
| 相關次數: | 點閱:110 下載:24 |
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台灣河水化學的變化反應了地質條件改變與氣候因素的影響,也顯示了水文循環的變異,本研究藉此了解當地環境的矽酸鹽類風化強度,以及圍岩組成的差異加上海水鹽沫的貢獻,如何共同影響著河水的化學特性,並解算矽酸鹽風化的貢獻比例以及其對於二氧化碳消耗速率的影響,尤其針對河川上游源頭區的河水,進行時間序列元素分析,明確建立岩石化學風化的通量以及對於河水化學確切的影響。
六龜區域雨水Ca2+濃度增高,可指示2007年3月份的沙塵暴以及8月颱風事件。濕季時,台灣處於夏季的濕暖氣候,福山地區的地下水位上升,因而影響到土壤水中化學特性的改變,使得9月份的元素濃度明顯有比其他月份偏高的趨勢。福山集水區的河水1~3月最接近海水線,正好是東北季風盛行的時期,且此地距離海岸邊大約只有20公里,因此河水化學中還能保有較多海水的訊號。相較之下,畢祿溪與六龜集水區河水化學特性可明顯反映出岩石風化的情況。
福山以及六龜集水區岩石化學風化主要受到矽酸鹽風化的影響,碳酸鹽的貢獻相對較不明顯;畢祿溪集水區則有相反的趨勢。Nasil加上Ksil共佔總陽離子的比例,在福山集水區平均為31%;畢祿溪集水區約為10%;六龜集水區大約為25%。可確切的知道矽酸鹽風化在畢祿溪流域並非主要的離子輸入來源。福山集水區與六龜集水區的Xsil與降雨量以及流量的變化趨勢有一致性,推測此兩流域內矽酸鹽風化的貢獻明顯受到大氣降水的影響。
七個集水區域來自矽酸鹽風化的溶解物質總量約為5.3x104 tons/yr,總共佔全世界總通量的0.01%,流域面積卻僅佔全球陸地面積的0.00076%。河源上游部份濕季的[ΦCO2]sil將可達乾季的6~80倍,雖然台灣地區河源上游流域岩石風化造成的二氧化碳消耗速率非常的大(平均約為9.5 x105mol/km2/yr),但由於流域面積小,因此對全球整體岩石風化造成的二氧化碳消耗通量卻顯得微不足道,並可推論岩石化學風化發生的位置主要集中在河源上游區域。
The variation of river water chemical characteristics of Taiwan will reflect the tectonic and climatic factors and also reveal the evolution of hydrologic cycle. This study try to present a new compilation of chemical and physical erosion rates in small catchments and show that silicate weathering rates are not governed by any single parameter but require consideration in multiple dimensions.
The three watersheds from north to south Taiwan are FuShan, PiLuHsi and LiuKuei, respectively. There are extremely high Ca concentrations of LK rainwater; it indicated the sand storm event in March and typhoon in August 2007. In wet season, the groundwater level arise then varied the composition of soil water. It has a significantly trend that the concentration of major elements are much higher in September than other month. River water of FuShan watershed can reflect the monsoon strength, so from January to March it much nears seawater line.
The total dissolved solid derived from silicate weathering is about 5.3x104 tons/yr; estimate near 0.01% of world total flux but the overall watershed area just accounts 0.00076% of worldwide continental area. The headwater tributaries CO2 consumption rate derived from silicate weathering in wet season is 6~80 times than in dry season, especially during typhoon period. Although CO2 consumption rate derived from rock weathering in Taiwan headwater tributaries are very large (average about 9.5x105mol/km2/yr), but due to the area of watershed are all very small were make the CO2 consumption fluxes become not worth mentioning. It is reasonable to make the conjectures that the main place of rock chemical weathering falls in the headwater tributaries.
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