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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/15423

Title: 淡水河沿岸沉積物粒徑分布之研究
Sediment size distributions in the Tan-Shui river
Authors: SHENG-CHIN SU
蘇勝欽
Contributors: NTOU:Department of Marine Environmental Informatics
國立臺灣海洋大學:海洋環境資訊學系
Keywords: 沉積物;粒徑;淡水河;分布
Sediment;distributions;Tan-shui river
Date: 2005
Issue Date: 2011-06-30T08:12:43Z
Abstract: 摘要 本研究自2005年6月至2006年3月,分夏、秋、冬三季於淡水河水域19個測站,採取底泥沉積物,經分析後結果發現: (1)各採樣點沉積物粒徑變化與水深並無明顯關係。其中秋、冬季 淡水河口外測站,深度6m水域d50為150μm,無小顆粒沉積物, 似乎是小顆粒沉積物隨潮汐往復運動,不易沉澱,且冬季東北 季風影響,將砂吹向河口所致。 (2)測站粒徑累積重量百分比分布呈雙峰現象之水域,為海洋巡防 總局前水域,夏季2∼8μm及88∼177μm;秋季2∼16μm及177 ∼250μm粒徑範圍內。淡水河口水域,秋季2∼16μm及250∼ 500μm粒徑範圍內。 (3)各測站沉積物d50粒徑季節性變化明顯水域位置,為海洋巡防總 局前水域粒徑底質,夏季d50由7μm(泥)至秋季變化為125μm (泥質砂)到至冬季變化為160μm(砂)。竹圍捷運站前水域 粒徑底質,夏季d50由141μm(砂)至秋季變化為7.6μm(泥) 到冬季變化為89μm(泥質砂)。獅子頭抽水站排水口前水域粒 徑底質,夏季d50由4μm(泥)至秋季變化為77μm(泥質砂)到 冬季變化為27μm(砂質泥)。 (4)究統計2005年6月(夏季)、2005年10月(秋季)及2006年2 月(冬季)淡水河集水區累積雨量與季節性底質變化的測站 (T3、T8、T11)進行分析,結果顯示,似乎是接近淡水河口, 屬逕流與潮汐混合營力型,受東北季風與潮汐影響所致,粒徑 底質變化與累積雨量並無關係。 (5)以百分比出現頻率,分析各河段底質,結果顯示上游段、下游 段、河口段均以砂底質為主;中游段較特殊,為泥底質。
Abstract Sediment samples were obtained from 19 stations in the Tan-Shui river in three separate seasons (Summer, Fall and Winter) between June 2005 and March 2006. Size analysis using sieves and laser particle sizer were performed. Results showed that: (1) Particle sizes measured did not vary consistently with the station depth. (2) At the station located outside the river mouth at the depth of 6m in the ocean, the d50 was about 150 □m in the fall and winter seasons. (3) Size distributions at the stations near the river mouth in the fall season and the nearby coastal gurard stations in the summer and fall seasons were bi-modal. (4) Several stations had marked seasonal variation in d50: at coastal guard station d50 was 7□m in the summer, 125□m in the fall and 160□m in the winter; at the Ju- Wei MRT station 141□m in the summer, 8□m in the fall and 89□m in the winter; and at the Su-Ju-Tou pumping station 4□m in the summer, 77□m in the fall and 27□m in the winter. (5) Examining the total rainfall in the month prior to the sampling, it was found that there were no clear trend in the variation of d50 in the above three stations and the rainfall. (6) It was also found, regardless of the seansonal variation, the upper, lower reaches and the river mouth region were mostly sands while the middle reach mostly mud.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0T934D0010
http://ntour.ntou.edu.tw/ir/handle/987654321/15423
Appears in Collections:[海洋環境資訊系] 博碩士論文

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