A model for simulating the response of runoff from the mountainous watersheds of inland river basins in the arid area of northwest China to climatic changes |
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Authors: | Ersi Kang Guodong Cheng Yongchao Lan Huijun Jin |
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Institution: | (1) Laboratory of Marine Geology, State Education Commission, 200092 Shanghai, China |
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Abstract: | The subaerial tidal sand area in the northern Jiangsu Province (Subei), stretching from Dongtai towards east with a fan shape,
is an early developing stage of radial sand ridges distributed in the South Yellow Sea. Since 5000–6000 a BP, after the Holocene
transgression maximum in the northern Jiangsu Province, subaqueous tidal sand bodies were exposed and changed into land gradually.
The environmental magnetism analysis shows that subaerial tidal sand strata are formed by the convergent-divergent paleo-tidal
current field. The sediment source of tidal sand strata came early from the Changjiang River and late from the Yellow River.
Sea floor erosion by tidal currents also served as an important sand source. Drilling cores and ground-penetrating profile
show that there exists no probability of sand supplying directly by a large river through the apical area of tidal sand ridges
either on land or in the sea. Fluvial deposits supplied the tidal sand bodies by alongshore transportation, which corresponds
to the conclusions obtained by the analyses of provenance and paleocurrent field.
Project supported by the National Natural Science Foundation of China (Grant Nos. 43236120 and 49676288). |
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Keywords: | Subei coastal plain tidal sand bodies paleo-tidal current field paleoenvironment |
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