| Citation: |
Hong-xian Chu, Sai Mei, Xiao-hui Gao, Zhong-hua Fang, Jing Feng, 2019. Analysis of formation and slope stability in Caofeidian Channel in Bohai Bay, China Geology, 2, 189-197. doi: 10.31035/cg2018057
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Analysis of formation and slope stability in Caofeidian Channel in Bohai Bay
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Abstract
In this paper, by studying bathymetric survey and shallow seismic detection data over multiple periods of history, the authors outline the geomorphic features of the Caofeidian Channel. The results of our studies indicate that the channel at the front end is dominated by erosion. The maximum water depth reaches 42.2 m, which sets the highest record for the water depth in Bohai Bay; the authors preliminarily conclude that the formation of the early channel occurred because the subsidence rate of the deep structure is slightly smaller than the deposition rate of the upper strata, and the Caofeidian Channel has existed for a long time, over 20 ka. The trending of the channel experienced a transition from the NS to the NE and then NW direction; the authors conclude that endogenic and exogenic processes, such as geological structures, the evolution of the ancient Luanhe River Delta, marine hydrodynamics, and human activity, jointly control the development and evolution of the geographic system in the Caofeidian sea area. The slope stabilities under the extreme conditions of a heavy storm and an earthquake are analyzed by performing simulations.
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Keywords:
- Caofeidian /
- channel /
- tidal current /
- deposition /
- erosion /
- stability
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References
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Hong-xian Chu, Sai Mei, Xiao-hui Gao, Zhong-hua Fang, Jing Feng, 2019. Analysis of formation and slope stability in Caofeidian Channel in Bohai Bay, China Geology, 2, 189-197. doi: 10.31035/cg2018057
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Figure 1.
Location of Caofeidian Channel study area.
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Figure 2.
Caofeidian south seabed profile.
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Figure 3.
The application effect of surge filter. a−Before correction; b−after correction.
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Figure 4.
The topographic map of the Caofeidian sea area with the location of the profile.
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Figure 5.
Instantaneous water depth profile of the Caofeidian south area.
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Figure 6.
Sand waves on the sub-bottom profile and side-scan sonar image.
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Figure 7.
Sub-bottom profile of the Caofeidian channel. F1−F7 represent faults; T0−T6 represent stratigraphic boundaries.
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Figure 8.
Geomorphic evolution impacted by the construction of the Caofeidian channel highway. a−Before construction; b−after construction.
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Figure 9.
Sketch map of the underwater slope stability calculation model.