Morphological stability analysis of the planned excavated-in harbor and its channel in the Hengsha Shoal of the Yangtze Estuary
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摘要: 提议中的横沙浅滩挖入式港池和入海航道区域位于长江口北港和北槽之间的横沙浅滩以及长江口外的水下三角洲海域.长江河口长期以来承受数亿万吨计流域来沙在河口区的堆积,发育了巨大的陆上和水下三角洲,横沙浅滩则是与崇明东滩、九段沙同为长江河口拦门沙地区的三大浅滩之一,长期以来位置和海床均十分稳定,是建设挖入式港池的理想区域.长江水下三角洲形成历史悠久,地形平坦,以三角洲沉积为主.随着近年来长江来沙量的逐渐减少,使长年来地形变幅甚小,对深水航道建设提供了有利的稳定环境.本文主要从海床稳定性的角度,对海床演变环境及演变趋势作出分析研究,为在长江口建设深水港提供参考.Abstract: The proposed excavated-in harbor and shipping channel are located in the adjacent region of Hengsha Shoal in the outer Changjiang River mouth. Accumulation of huge amount of sediment from the upstream Changjiang River occurs in the river mouth, resulted in the large delta area on both land and submarine. Hengsha Shoal is recognized as one of the three largest shallow shoals, with Chongming East Shoal and Jiuduansha Shoal in the sandbar region of Changjiang River mouth. It shows stable location and bathymetry pattern in the long-term history, which indicates it's an excellent location for a new harbor. During its long history of the submarine delta, the bathymetry is mainly flat and under the deposition effect of delta. With the recent deceasing of the sediment load from the Changjiang River, there is small evolution of the bathymetry. This is favorable for construction of the shipping channel into excavated-in harbor. This paper mainly focuses on the morphological stability of the bathymetry and its evolution trend, to provide some basic support for the new deep harbor.
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Key words:
- excavated-in harbor /
- Hengsha Shoal /
- morphological stability
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[1] [1] 陈吉余.长江口拦门沙及水下三角洲的动力沉积、演变和深水航道治理[J].华东师范大学学报:自然科学版, 长江口深水航道治理与港口建设专辑,1995:1\|22. [2] 恽才兴.图说长江河口演变[M].北京:海洋出版社,2010. [3] 虞志英,恽才兴. 长江口北槽外水下地形、沉积环境和对三期外航道的影响[R]. 上海:华东师范大学,2004. [4] 虞志英,恽才兴.横沙东滩吹泥上滩促淤造地工程自然条件和促淤效果分析[R]. 上海:华东师范大学, 2002.
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