刘杰, 程海峰, 韩露, 王珍珍. 长江口12.5 m深水航道回淤年际变化及成因[J]. 水科学进展, 2019, 30(1): 65-75. DOI: 10.14042/j.cnki.32.1309.2019.01.007
引用本文: 刘杰, 程海峰, 韩露, 王珍珍. 长江口12.5 m深水航道回淤年际变化及成因[J]. 水科学进展, 2019, 30(1): 65-75. DOI: 10.14042/j.cnki.32.1309.2019.01.007
LIU Jie, CHENG Haifeng, HAN Lu, WANG Zhenzhen. Interannual variations on siltation of the 12.5 m deepwater navigation channel in Yangtze Estuary[J]. Advances in Water Science, 2019, 30(1): 65-75. DOI: 10.14042/j.cnki.32.1309.2019.01.007
Citation: LIU Jie, CHENG Haifeng, HAN Lu, WANG Zhenzhen. Interannual variations on siltation of the 12.5 m deepwater navigation channel in Yangtze Estuary[J]. Advances in Water Science, 2019, 30(1): 65-75. DOI: 10.14042/j.cnki.32.1309.2019.01.007

长江口12.5 m深水航道回淤年际变化及成因

Interannual variations on siltation of the 12.5 m deepwater navigation channel in Yangtze Estuary

  • 摘要: 长江口12.5 m深水航道回淤量大,影响因素复杂。利用2011-2017年长江口航道水下地形、水文测验和航道回淤等系列资料,研究了12.5 m深水航道回淤的年际变化过程和原因。结果表明:① 12.5 m深水航道回淤总体呈现稳中下降的变化特征。②南港-圆圆沙段因航道滩槽高差的缩小和上游底沙输沙量的减少,回淤呈逐年减少态势。③北槽段因南坝田挡沙堤加高工程的实施和台风影响偏弱,2016-2017年回淤较此前有所减少;径流影响北槽最大浑浊带的发育部位,进而影响北槽航道回淤的部位,2016-2017年长江口径流量偏大是北槽航道主要回淤部位较往年偏下的主要原因。④流域减沙对12.5 m深水航道回淤的影响已开始显现。未来受其影响,南港-圆圆沙航道回淤有望进一步下降并维持较低量值,北槽航道回淤有望维持稳中下降态势。

     

    Abstract: A series of dredging,hydrologic and topographic in situ measured data are collected to study interannual variations and associated causes of siltation in the 12.5 m Deepwater Navigation Channel (DNC). The results show that:the annual siltation intensity of DNC is characterized by a steady decrease. The siltation intensity of the South Channel to the Yuanyuansha Channel in the upper reach of DNC obviously decreased. The siltation intensity of the North Passage was fluctuating from 2011 to 2015,but it decreased in 2016—2017. The decline of siltation in the South Channel to the Yuanyuansha Channel is mainly related to the decrease of bed load transported from the upper reach and the reduction of elevation difference between the nearby shoals and troughes. The project of the Sand-retaining Dike and the deline of the impact induced by typhoons are the main cause of the decrease of siltation in the North Passage in 2016 and 2017.The large runoff in 2016 & 2017 led to the turbidity maximum zone and the position of main siltation in the North Passage moves downward. The effect of fluvial sediment decline on the siltation of DNC has been emerged gradually. In future,due to those influences,the siltation of the South Channel to the Yuanyuansha Channel will experience declining furtherly and maintain a lower value,while the siltation in the North Passage also will keep a steady downward trend.

     

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