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Liu, Zhenxia; Berne, Serge; Saito, Yoshiki; Yu, Hua; Trentesaux, Alain; Uehara, Katsuto; Yin, Ping; Liu, J. Paul; Li, Chaoxing; Hu, Guanghai; Wang, Xiangqin. |
On the basis of bathymetric and seismic data and data from piston cores collected by the Chinese-French marine geology and geophysics investigation of 1996, we discuss the internal architecture and mobility of tidal sand ridges in the East China Sea (ECS). We characterized the sand ridges on the middle to outer shelf of the ECS as tide-dominated sand ridges with southwest dipping beds, indicating that the regional net sediment transport is toward the southwest. As the sand ridges gradually migrate toward the southwest, new sand ridges are continually replacing old ones, and several generations of sand ridges have developed in the study area. High-resolution seismic data, acoustic Doppler current profiler data, and two C-14-dated piston cores, DGKS9614... |
Tipo: Text |
Palavras-chave: Transgression; Ridge evolution; East China Sea; Mobility; Internal architecture; Tidal sand ridge. |
Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3309.pdf |
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Tamura, Toru; Nguyen, Van Lap; Oanh Ta, Thi Kim; Bateman, Mark D.; Gugliotta, Marcello; Anthony, Edward J.; Nakashima, Rei; Saito, Yoshiki. |
Since the 1990s the Mekong River delta has suffered a large decline in sediment supply causing coastal erosion, following catchment disturbance through hydropower dam construction and sand extraction. However, our new geological reconstruction of 2500-years of delta shoreline changes show that serious coastal erosion actually started much earlier. Data shows the sandy coast bounding river mouths accreted consistently at a rate of +2 to +4 km(2)/year. In contrast, we identified a variable accretion rate of the muddy deltaic protrusion at Camau; it was<+1 km(2)/year before 1400 years ago but increased drastically around 600 years ago, forming the entire Camau Peninsula. This high level of mud supply had sharply declined by the early 20th century after a... |
Tipo: Text |
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Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76858/78081.pdf |
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