Evidence of hyperpycnal flows at the head of the meandering Kaoping Canyon off SW Taiwan |
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| Authors: | Email author" target="_blank">Cheng-Shing?ChiangEmail author Ho-Shing?Yu |
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| Institution: | (1) Hsiuping Institute of Technology, 11 Gungye Rd., Dali City, Taichung, Taiwan, Republic of China;(2) Institute of Oceanography, National Taiwan University, 1 Sect. 4 Roosevelt Rd., Taipei, Taiwan, Republic of China |
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| Abstract: | Using seismic and Chirp sonar profiles, this paper tests the hypothesis that hyperpycnal flows are the main factor controlling
the formation and maintenance of the meandering Kaoping submarine canyon off SW Taiwan. Cross-section geometries, and erosional
as well as depositional features vary along the canyon course. In the proximal, sinuous part of the canyon, down-cutting into
the shelf strata has created a relief of 340 m. The cause of this intense erosion of the seafloor is suggested to be the frequent
development of hyperpycnal flows. A seismic section across a meander in the distal part of the canyon shows levees formed
by overspilled sediments at the outer bend, and a terrace characterized by relatively flat stratified facies at the inner
bend. The geological setting and climatic conditions in SW Taiwan (e.g. earthquakes, typhoons, floods), as well as major river–canyon
connections (for example, direct input of highly concentrated suspended sediment) would all promote hyperpycnal flow generation.
This causes axial incision, canyon wall slumping, and the formation of levees by spill-over deposition in the upper reach
of the Kaoping Canyon. |
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