长江口横沙东滩外侧建设人工岛的自然条件分析

发布时间：2018-06-13 21:21

本文选题：河势变化 + 动力条件　；参考：《海洋学报(中文版)》2014年11期

【摘要】：利用2001-2008年的海图资料和2011-2012年枯季现场水文调查数据,分析长江口横沙东滩外侧海域的河势、水动力条件及泥沙含量的潮周期过程,讨论在此建设人工岛的自然条件。结果表明,横沙东滩外侧海域,2001-2008年间冲淤有变化,由滩向海的断面显示上部淤积,下部侵蚀,冲淤转换面在-7~-10m之间,-10~-20m海域整体呈现微冲趋势,但侵蚀速率减缓,河势趋于稳定。横沙东滩受北槽深水航道北导堤影响,向东南方向淤进。定点船测潮流表现出旋转流性质,枯季大潮最大流速不超过188cm/s,小潮最大流速小于134cm/s;北港口外的定点余流显示向口内输运,北槽口外则是向海输运。两测站数据显示枯季大小潮垂线平均含沙量处于0.061~0.116kg/m3之间,水体泥沙含量整体处在较低水平。从自然条件上来说,不考虑风浪影响情况,研究区域内河势渐趋稳定,水深条件良好,水动力条件适宜,水体含沙量较低,在该区域内建设人工岛具有可行性。
[Abstract]:Based on the data of the nautical chart from 2001 to 2008 and the field hydrological survey data in the dry season of 2011-2012, the river regime, hydrodynamic condition and the tidal cycle process of sediment content in the area outside the East Beach of Hengsha River Estuary are analyzed, and the natural conditions for the construction of artificial island are discussed. The results show that the scour and siltation occurred in the outer sea area of the east beach of Hengsha from 2001 to 2008. The upper part is siltation and the lower part is eroding from the section of the beach to the sea, and the transition surface of scour and deposition shows a microscouring trend between -7 ~ 10 m and -10 ~ 10 m, but the erosion rate slows down, and the river regime tends to be stable. The Dongtan is silted southeast by the north channel of the North Channel. The tidal current measured by a fixed-point ship shows the nature of rotating flow, the maximum velocity of the spring tide is not more than 188cm / s in the dry season, the maximum velocity of the low tide is less than 134cm / s, and the residual current at a fixed point outside the north port indicates that it is transported to the mouth and the north trough is transported to the sea. The data of the two stations show that the average sediment content of the vertical line in the dry season is between 0.061~0.116kg/m3 and the sediment content of the water is at a relatively low level. In terms of natural conditions, the river regime in the study area is gradually stable, the water depth condition is good, the hydrodynamic condition is suitable, and the sediment content of the water body is low, so it is feasible to construct artificial island in the study area without considering the influence of wind and wave.
【作者单位】：华东师范大学河口海岸学国家重点实验室;
【基金】：上海市科学技术委员会重大项目(11dz1204900,12231203100)
【分类号】：U652

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