Evolution of radiative sand ridge field of the South Yellow Sea and its sedimentary characteristics |
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Authors: | Ying Wang Dakui Zhu Kunyuan You Shaoming Pan Xiaodong Zhu Xinqing Zou Yongzhan Zhang |
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Institution: | (1) State Pilot Laboratory of Coast & Island Exploitation, Nanjing University, 210093 Nanjing, China |
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Abstract: | A sand ridge field of 22 470 km2 consists of fine sands and silts originally from the old Changjiang River sediment during the late Pleistocene period. Late
Holocene sand stratum with its well-preserved larmnary bedding of more clay particles reflects the influence from the Yellow
River. There are three genetic types of morphology of sand ridge field as follows: (i) reformed alluvial sandy bodies and
old river valleys, located in the central and southern parts, formed from the end of Pleistocene to the present. (ii) Radiative
current ridges and patrimonal valley type, located in the northeastern part, formed during the early or middle Holocene time.
(iii) Eroded-depositional sandy bodies in the north and outer parts, and erosional trough in the north formed since the middle
Holocene transgression.
The sand ridge field has a periodic nature of developing processes: the period of sediment accumulation by rivers during cold
epoch with low sea level and the period of erosional formation by tidal currents during warm epoch of transgression. The river-sea
interactive process in the area is closely related to the climate change; the rising and falling of the sea level is the detonating
agent of the coast zone land-sea dynamic interactive processes. They can be summarized as “transgression-dynamic-sedimentation”
processes.
Project supported by the National Natural Science Foundation of China (Grant No. 49236120). Pmject codmg: SCIEL 21198103. |
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Keywords: | the Yellow Sea submarine sand ridge field tidal current channel |
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