2005-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/677689摘要：台灣河川屬於島嶼型河川，山高水急，加上台灣經常發生地震以及颱風季節所帶來得豐沛雨量，造成河川經常攜帶大量的懸浮顆粒。這些大量的懸浮顆粒經由河川向鄰近的外海輸出，將會對週遭海域有相當程度的影響。本研究之目的是藉由高屏外海陸棚及陸坡海域沉積物之顆粒大小組成與金屬含量之分析，探討高屏外海沉積物區域與垂直（時間）之分佈變化，以期根據沉積物之區域與垂直分佈變化來釐清瞭解河川系統藉由峽谷向大洋傳輸的重要性與高屏外海沉積物之傳輸、搬運與埋藏機制。 研究結果顯示，高屏外海沉積物顆粒大小組成呈現明顯區域性變化。在陸棚及陸坡海域沉積物多以細顆粒為主，可能為高屏溪常年輸出之大量細顆粒陸源物質沉降埋藏之結果。高屏峽谷內沉積物顆粒大小組成變化頗巨，可能與高屏溪輸出之陸源物質有密切關係，且亦可能與高屏峽谷之地形地貌有關。而高屏峽谷內沉積物之來源組成隨時間有明顯之改變。這些埋藏於高屏峽谷的沉積物可能僅為短暫沉積，再經由潮流或另一次大水而被傳輸帶往更深之海域或其他地區沉積。目前研究顯示高屏峽谷沉積物呈現dynamic變化，而確切之傳輸模式及最終之埋藏海域仍需進一步做深入研究。 <br> Abstract: Small Asian rivers delivered a large amount of suspended particle to the ocean. However, limited information concerning fate of these particles entering the marine environments is available. In this study, we investigated sediment geochemical properties of the continental margin sediments off the Kaoping River, Southwestern Taiwan to demonstrate the source(s) and fate of river derived terrigenous materials on the continental margin. Sediment grain size, organic carbon, organic carbon 13C, C/N ratios, carbonate, metals (Al, Fe, Mn, Zn, Cu, Zn, Pb, Cd) were determined. The results showed that Kaoping River is the major source of terrigenous sediment deposited in the region. Kaoping River channel extends directly into the canyon from river mouth to shelf, slope and into the South China Sea. The canyon becomes the conduit for the fine-grained sediment from the River to the upper slope. From upper slope, fine-grained sediments spread along the slope in a northwest/southeast direction. Fine-grained sediments were found near the river mouth, in the canyon and upper slope, with most coarse-grained sand found on shelf along the coast. However, some coarse-grained sands were also found inside the canyon in the upper slope. Higher concentrations of organic carbon, metals showed similar features. In addition, lighter organic carbon 13C were also found near the river mouth, extending through shelf to the slope inside the canyon.