Internal architecture and mobility of tidal sand ridges in the East China Sea

Type Article
Date 2007-07
Language English
Author(s) Liu Zhenxia1, Berne Serge4, Saito Yoshiki3, Yu Hua2, Trentesaux Alain5, Uehara Katsuto6, Yin Ping7, Liu J. Paul8, Li Chaoxing1, Hu Guanghai1, 9, Wang Xiangqin1
Affiliation(s) 1 : State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China.
2 : Rice Univ, Houston, TX 77005 USA.
3 : AIST, Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan.
4 : IFREMER, DRO, GM, F-29280 Plouzane, France.
5 : Univ Lille 1, CNRS, UMR 8110, PBDS Lab, F-59655 Villeneuve Dascq, France.
6 : Kyushu Univ, DSRC, RIAM, Kasuga, Fukuoka 8168580, Japan.
7 : Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China.
8 : N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA.
9 : Ocean Univ Qingdao, Qingdao 266061, Peoples R China.
Source Continental Shelf Research (0278-4343) (Elsevier), 2007-07 , Vol. 27 , N. 13 , P. 1820-1834
DOI 10.1016/j.csr.2007.03.002
WOS© Times Cited 52
Keyword(s) Transgression, Ridge evolution, East China Sea, Mobility, Internal architecture, Tidal sand ridge
Abstract 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 and DGKS9612-from a sand ridge swale and crest, respectively-show that these sand ridges, which are at water depths of 90-100 m, have been migrating for the last ca. 2-3 kyr at least, though these ridges have previously been interpreted as moribund or relict. Sequence stratigraphic interpretation of seismic profiles and core data show that tidal ridges in the ECS evolved from muddier sand ridges formed during the last transgression to sandier shelf sand ridges in response to the shoreline retreat, which resulted in a decrease of riverine muddy sediments and recycling of sandy materials by tidal currents. Most active sand ridge formation occurred during the last transgression, but the present sand ridges on the middle to outer shelf are still being influenced by the modern hydrodynamics. Therefore, these sand ridges on the ECS shelf should be referred to as "quasi-active sand ridges" rather than as moribund or relict sand ridges. (C) 2007 Elsevier Ltd. All rights reserved.
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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 (2007). Internal architecture and mobility of tidal sand ridges in the East China Sea. Continental Shelf Research, 27(13), 1820-1834. Publisher's official version : , Open Access version :