| Citation: |
Mao-sheng Gao, Guo-hua Hou, Xian-zhang Dang, Xue-yong Huang, 2020. Sediment distribution characteristics and environment evolution within 100 years in western Laizhou Bay, Bohai Sea, China, China Geology, 3, 445-454. doi: 10.31035/cg2020036
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Sediment distribution characteristics and environment evolution within 100 years in western Laizhou Bay, Bohai Sea, China
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Abstract
This study is about the reconstruction of fluvial origins based on the grain size distribution of sediment deposits in the western Laizhou Bay, Bohai Sea, China. Thirteen sediment cores were selected to research sediment characteristics using the Sahu discriminant formula, C-M diagram, and Folk method. The results showed: (1) Bounded by the Guangli River estuary, the north sediment was affected by the water and sand flowing from the Yellow River during different periods. The south sediment came from multi-source rivers under the influence of the Xiaoqing River, Mihe River, and other coastal rivers; (2) the deposited sediments were dated by a clear historical record of the branched channel oscillation combined with the characteristics of the diversion channel, erosion, and regression. The subaqueous delta overlapped during several Yellow River channel runs (1897–1904, 1929–1934, 1938–1947, 1947–1953, 1976–1996) and the deposited sediment facies changed (the north tidal flat-abandoned subaqueous delta-lateral delta-delta front); (3) the deposited sediment characteristics can be revealed by studying the branched diversions of the Yellow River and coastal multi-rivers of the past one hundred years.
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Keywords:
- Sediment /
- Grain size /
- Silt /
- Environment evolution /
- Distribution characteristic /
- Hydrogeological engineering /
- Laizhou Bay /
- Qingdao City /
- China
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References
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Mao-sheng Gao, Guo-hua Hou, Xian-zhang Dang, Xue-yong Huang, 2020. Sediment distribution characteristics and environment evolution within 100 years in western Laizhou Bay, Bohai Sea, China, China Geology, 3, 445-454. doi: 10.31035/cg2020036
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Figure 1.
The location of research area and 13 core sites in western of the Laizhou Bay.
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Figure 2.
Triangular diagram of sand-silt-clay in column samplings.
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Figure 3.
Vertical grain size distribution and the main parameters in 13 cores.
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Figure 4.
Vertical distribution of the parameter discriminant value in eight cores.
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Figure 5.
The C-M diagrams of sedimentary column sampling in western Laizhou Bay. Eight sedimentary segments (Ⅰ–Ⅷ) and five sedimentary graph sections (NO, OP, PQ, QR and RS) by C and M. RS–homogenous suspension; QR–graded suspension; PQ–dominated by suspended deposition; OP–mainly rolling transportion mixed with suspension; NO–rolling transportion.
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Figure 6.
The fence diagrams and sedimentary facies model in Western Laizhou Bay, China (Modified from Cheng GD and Xue CT, 1997; Xue CT and Ding D, 2008).
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Figure 7.
Vertical distribution of the grain size and cumulative relative curve in the shallow sea.
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Figure 8.
Diversions of the Yellow River and sedimentary area of coastal rivers within 100 years. a–the Yellow River diversion at Guangli estuary (1897–1904 and 1929–1934); b–the Yellow River diverted to north in three strands (1934–1938 and 1947–1953), and a new sediment area forming (Guangli River as a separate distributary); c–the Yellow River flowed to Qingshui Ditch, and the sediment area spread (1976–1996).
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Figure 9.
Sea rice of saline-alkali soil in Shandong coastal (after Pan JQ, 2018).