https://scholars.lib.ntu.edu.tw/handle/123456789/40748
標題: | 行政院國家科學委員會專題研究計畫成果報告:斜坡地形演化與地形定年─(總計畫及子計畫一)台灣北部地區階地短時幅演育模式之研究(III) | 作者: | 林俊全 | 關鍵字: | 集水區;懸移質;颱風;有效流量;catchment;suspended sediment;Typhoons;effective discharge | 公開日期: | 2000 | 出版社: | 臺北市:國立臺灣大學地理環境資源學系暨研究所 | 摘要: | 本研究欲探討颱風對於蘭陽溪 上游集水區懸移質生產特性的影 響,並分析1975-1996 年間的懸移質 生產特性。因為缺乏連續觀測的懸移 質資料,因此利用日平均流量與日懸 移質生產量的資料建立率定曲線:Qs =1.508(Q)2.0798,判定係數(R2)為 0.5286。蘭陽溪上游集水區的懸移質 搬運屬於「搬運限制( transportlimited) 」,因此可利用率定曲線進 行推估。 1975-1996 年間,90%的流量低於 30cms , 30cms 的流量狀態搬運 19.69%的懸移質,而其餘的流量,則 搬運80.31%的懸移質,此結果表示本 集水區的懸移質主要受到不常發生 的低頻率、大規模流量事件的搬運。 20cms 的流量為觀測期間的「有效流 量」,表示不能忽略高頻率、小規模 的流量事件。 颱風的時間只佔了觀測期間的 6.47%,卻搬運了59%的懸移質。歷 年颱風對於蘭陽溪上游集水區的影 響不一,主要受到颱風降雨規模的影 響。分析1975-1996 年的資料後,本 研究認為颱風是移除蘭陽溪上游集 水區懸移質的主要搬運力量。 In this research, we focus on the characteristics of suspended sediment of the study area and the influences of Typhoons at upstream area of Lan-yan chi drainage catchment. The data applied is between 1975 and 1996. The correlation of the total suspended sediment yields are based on the specific relationship between discharge and sediment at the gauging station. The regression model of rating curve is Qs =1.508(Q)2.0798 and the coefficient of determination(R2)is 0.5286。The water discharge against suspended sediment shows the relationship between these two variables is transport limited. During the periods of observations (1975- 1996), 90% of the water discharge are lower than 30cms which transport 19.69% of the total suspended sediment yields. The others transport 80.31%. Consequently, the events of low frequency and large magnitude are the dominant transport process of suspended sediment. Daily discharge of 20cms is the effective discharge between 1975-1996. 6.47% of the total period is affected by Typhoons and 59% of the total suspended sediment are removed by Typhoons. The impacts of Typhoons are dynamic every year. The magnitude of rainfall is the main factor. The result show that Typhoons are the main process in removing suspended sediment from the upper catchment of Lan-yan Chi. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11369 | 其他識別: | 892116M002024 | Rights: | 國立臺灣大學地理環境資源學系暨研究所 |
顯示於: | 地理環境資源學系 |
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892116M002024.pdf | 113.66 kB | Adobe PDF | 檢視/開啟 |
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