2006-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/692425摘要：高屏溪每年往外海輸出49百萬噸的懸浮顆粒，如此大量的陸源物質輸出至海洋，將會對周圍海域有相當程度的影響。颱風季節所帶來的豐沛雨量，可能使河水攜帶的懸浮顆粒達hyperpycnal狀態。hyperpycnal河川向海洋傳輸懸浮顆粒的路徑機制，及其最終於何處埋藏仍不是非常清楚。高屏溪輸出之大量陸源物質可能經由高屏峽谷向深海傳輸埋藏，其可能是經由一件的颱風事件帶至高屏峽谷，亦可能是經由多次搬運的結果。這些沉積物的傳輸機制及沉積物最終埋藏的宿命目前仍不清楚。 本研究於碧利斯颱風前後採集從高屏溪河口沿著高屏峽谷至深海的一系列沉積物及海水懸浮顆粒樣品，並分析懸浮顆粒濃度及粒徑大小組成等，探討颱風前後高屏峽谷內懸浮顆粒及沉積物的變化，以瞭解一個颱風事件經由高屏溪輸出至外海的懸浮顆粒其傳輸路徑及最終埋藏宿命，且探討颱風前後期間高屏峽谷對於高屏溪懸浮顆粒之輸出所扮演的角色，以更深入的探討高屏溪藉由高屏峽谷向深海傳輸陸源物質之輻度與重要性。 研究結果顯示，碧利斯颱風前後高屏峽谷內水體之懸浮顆粒濃度呈現明顯的變化差異。當颱風來襲之後，整個高屏峽谷內之懸浮顆粒含量明顯大幅度增加，懸浮顆粒總量可達7.4百萬噸，為颱風前的10倍以上，顯示颱風期間高屏溪藉由高屏峽谷向外海輸出大量的懸浮顆粒。颱風3個月後，懸浮顆粒濃度則明顯下降，於颱風期間所輸出之高懸浮顆粒已大部份沉降至沉積物或被傳輸至更遠的外海去。高屏峽谷內表層沉積物粒徑大小呈現明顯的空間變化，且颱風前後沉積物粒徑大小之分佈變化亦呈現明顯的差異。高屏溪細顆粒沉積物可於颱風期間藉由高屏峽谷傳輸至75 km遠之深海沉積，粗顆粒亦可藉由高屏峽谷向外海傳輸，顯示高屏峽谷於颱風期間對於高屏溪陸源物質向外海之傳輸扮演著非常重要的角色。 <br> Abstract: Kaoping River transports approximately 49 million tons/year of suspended sediments to the ocean. However, very little information is available concerning the fate of these large amounts of terrigenous materials in the ocean. Among the various mechanisms in transporting river particles, hyperpycnal flow induced by typhoon maybe one major process in transporting materials to the ocean. Once entering the ocean, the pathway and final fate of the suspended sediment carry by the hyperpycnal flow, however, was not clear. In addition to the large amounts of suspended carrying by the hyperpycnal flow, the part by river water under non-hyperpycnal condition was also not well studied. In order to understand the role of Kaoping Canyon as a conduit over the material transport inside the Canyon, especially that by the hyperpycnal flow induced by the typhoon, a series of core sediments and suspended particles were sampled inside the Canyon from the river mouth to the deep South China Sea basin prior to and after the Typhoon Bilis. Total suspended particles concentration and sediment grain size were determined. Cored sediments and suspended particle taken prior to and after the Typhoon were used to compare the effect of typhoon, in particular, the distance of particle transport, the thickness and grain size of new materials in core and the possibility of re-suspension by the typhoon. The results showed that a large variation of suspended particles concentrations in water column inside the Kaoping Canyon taken prior to and after the Typhoon Bilis. After the Typhoon invaded, the amount of suspended particle inside the Canyon increased tremendously, approximately ten times prior to the Typhoon. Total amount of suspended particle inside the Canyon after the Typhoon is at least 7.4 M tons. Most suspended particles exported during the Typhoon period were deposited or transported to the deep SCS basin after 3 months of the Typhoon invasion. In addition, the grain size of sediments inside the Canyon showed distinctly spatial and vertical variations prior to and after the Typhoon. Fine- and coarse-grained suspended particles from the Kaoping River could be transported through the Kaoping Canyon to deep ocean during a typhoon event.