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1
題名:Sediment Budget in the Taiwan Strait with High Fluvial Sediment Inputs from Mountainous Rivers: New Observations and Synthesis    
著者:Shuh-Ji KaoSen JanShih-Chieh HsuTsung-You LeeMin-Han Dai
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:Mud ; River ; Sediment ; Sedimentation rate ; Taiwan Strait
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:19卷5期(2008.10)
頁碼:525-546
語言:英語
摘要: 英文摘要PDF

The shallow Taiwan Strait at the southern opening of the East China Sea (ECS) receives abundant sediments from turbid mountainous rivers in Taiwan. The volume of sediment is among the highest sediment yields on the global surface. This large amount of sediment discharged from modern Taiwan (range: 175-380 Mt y-1 based on 50-yr data) is comparable to that discharged from Changjaing (500 Mt y-1-decreasing in recent decades), underscoring the importance of sediment budget in the Taiwan Strait and sediment flux from Taiwan into the ECS. We documented fluvial mud and sand concentrations during flash flooding with our observations indicating that fluvial materials in Taiwan's rivers are chiefly composed of mud (>70% and up to 98%). By contrast, sand fraction dominates (> 85% for most stations) surface sediments in the Taiwan Strait. Super typhoon Herb alone delivered 130 Mt of sediments from Choshui, the largest river in Taiwan, yet only insignificant amounts of mud were found at the river mouth six months later. The actions of waves, tides, and currents apparently prevent the deposition of fine grained sediments. Assuming sand occupied 30%(the maximum) of the 60 Mt y-1 total sediment input from major western Taiwanese rivers, our annual budget estimate shows that the amount of sand input (18±5 Mt y-1) is comparable to the burial output of sand (12±10 Mt y-1). However, mud burial (6±5 Mt y-1) in the strait is far below the estimated mud input (42±11 Mt y-1), resulting in a significant shortfall. Hydrodynamic conditions were synthesized to explain the distribution pattern of limited mud patches in the strait and to reveal potential pathways by which fine-grain sediment transportation takes place in the seas surrounding Taiwan. A significant shortfall in the mud budget in the Taiwan Strait suggests that ~85% of the fluvial mud left the strait. Alternatively, the 50-year modern sediment flux data used in this study reflects exacerbated sediment flux due to human activity and is possibly too high to represent loads during pre-Anthropocene. Additional studies are needed to explore the flux and fate of mud in and surrounding Taiwan over a longer time scale.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 19卷5期 (2008.10)
Link between Crustal Magnetization and Earthquakes in Taiwan/ Shu-Kun HsuYi-Ching YehChung-Liang LoAndrew Tien-Shun LinWen-Bin Doo
Effect of Surface Geology on Ground Motions: The Case of Station TAP056-Chutzuhu Site/ Kuo-Liang WenChe-Min LinHsien-Jen ChiangChun-Hsiang KuoYu-Chih HuangHsin-Chieh Pu
Seismological Studies for Tensile Faults/ Gwo-Bin Ou
Fault Zone Resistivity Structure and Monitoring at the Taiwan Chelungpu Drilling Project (TCDP)/ Chih-Wen ChiangMartyn J. UnsworthChow-Son ChenChien-Chih ChenAndrew Tien-Shun LinHan-Lun Hsu
Ionospheric GPS TEC Anomalies and M?5.9 Earthquakes in Indonesia during 1993-2002/ Sarmoko SarosoJann-Yenq LiuKatsumi HattoriChia-Hung Chen
Relationships between Organic Material and Thermal Maturity Derived from Coal and C-Shale Samples/ Louis L. TsaiHuey-Jane HsiehHsien-Tsung LeeLi-Chung Sun
Decadal Oscillation of Fall Temperature in Taiwan/ Jau-Ming ChenFang-Chung LuChing-Feng Shih
Measurements and Mesoscale Modeling of Autumnal Vertical Ozone Profiles in Southern Taiwan/ Yen-Ping PengKang-Shin ChenJie-Chung LouShih-Wei HwangWen-Cheng WangChia-Hsiang LaiMong-Yu Tsai
The Initial Results of the Chung-Li Dynasonde for RF Environment Surveillance and Ionospheric Observations/ Tung-Yuan HsiaoLung-Chih TsaiFrank Tom Berkey
Sediment Budget in the Taiwan Strait with High Fluvial Sediment Inputs from Mountainous Rivers: New Observations and Synthesis/ Shuh-Ji KaoSen JanShih-Chieh HsuTsung-You LeeMin-Han Dai
 
   
 
   

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