請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74689
標題: | 頭前溪與蘭陽溪流域之降雨量、山崩及河川化性之關係 Relationships between Rainfall, Landslide and River chemistry around Tao-Cheng and Lanyang catchments |
作者: | Ting-Ni Hsieh 謝(王亭)妮 |
指導教授: | 陳宏宇(Hongey Chen) |
關鍵字: | 顆粒性碳,溶解性碳,離子濃度,山崩,輸砂量,颱風, particulate carbon,dissolved carbon,ion concentration,landslide,sediment discharge,typhoon, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本研究主要在探討北台灣西半部的頭前溪,以及東半部蘭陽溪兩個集水區流域,自 2009 年至 2017 年間,其降雨、崩塌和輸砂量在 5 個相同颱風事件中的相互關係與特性。調查工作並於 2018 年 9 月至 2019 年 3 月期間,進行兩個流域上游及下游的河川採樣,分析顆粒性有機碳、無機碳與溶解態有機碳、無機碳之濃度與含量在不同流域的分布特性,以及上下游空間上之差異關係。另外,從溶解態離子濃度的分析,包括 Na+、K+、Mg2+、Ca2+、SO42-和 Cl-,可以進一步探討兩集水區流域之矽酸鹽類和碳酸鹽類之風化速率。研究結果也發現,頭前溪與蘭陽溪流域之溶解態離子,主要是分別由矽酸鹽與碳酸鹽類所貢獻。
從近十年 SPOT 衛星影像在颱風事件的崩塌判釋結果發現,蘭陽溪流域之崩塌率介於 0.98%至 2.17%之間,2012 年蘇拉颱風過後崩塌率最高,達 2.17%,頭前溪流域之崩塌率介於 0.22%至 0.3%之間。在空間分布上,山崩事件大部分集中在上游地區,其崩塌的重現率高於新生率。輸砂量的估算結果顯示,蘭陽溪流域各颱風事件的總輸砂量與降雨量以 2012 年蘇拉颱風的 12.7 百萬噸及 1880.5mm為最高;頭前溪流域則以莫拉克颱風之總輸砂量 0.46 萬噸及總降雨量 1050mm 最高。在颱風期間,兩集水區流域之降雨量與輸砂量呈現正相關。年平均輸砂量在蘭陽溪集水區下游及上游分別為 4.65 百萬噸與 1.21 百萬噸,頭前溪集水區下游及上游分別為11.1 萬噸與7.6 萬噸,也即兩集水區流域之下游輸砂量均高於上游。整體而言,位於東部的蘭陽溪流域之輸砂量高於西部之頭前溪流域,其年平均輸砂量的差異介於 11 至 60 倍之間。 This research focus on the relationship between rainfall, landslides distribution and sediment discharge in four typhoon events during the period 2009-2017. We conducted investigations and hydro-chemical sampling from September 2018 to March 2019 along Lanyang and Tao-Cheng catchments in the east and west part of northern Taiwan, respectively. With analyzing the particulate carbon and dissolved carbon in the rivers, we found the spatial difference between the upstream and downstream as well as the difference between the two catchments. Besides, based on the major ion composition : Na+、 K+、 Mg2+、 Ca2+、 SO42-, and Cl-, the chemical weathering sources were dominated by the decomposition of silicates and carbonates. The results show that the major ion sources of Tao-Cheng river and Lanyang river are silicates and carbonates, respectively. According to the interpretations of the SPOT satellite images in 10 years, the landslide ratios ranged from 0.98 % to 2.17 % along Lanyang catchment. The highest difference of landslide ratio occurred in Typhoon Saola which is 2.17%. In contrast, the landslide ratio ranged from 0.22 % to 0.30 % along the Tao-Cheng catchment is lower than Lanyang catchment. From the statistics of the sediment discharge and rainfall in each typhoon events, there are the highest sediment discharge and average daily rainfall in Typhoon Saola and Morakot along Lanyang and Tao-Cheng catchments, respectively. This result revealed that a good correlation between rainfall and sediment discharge. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74689 |
DOI: | 10.6342/NTU201904447 |
全文授權: | 有償授權 |
顯示於系所單位: | 地質科學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-108-1.pdf 目前未授權公開取用 | 13.48 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。