长江口北槽12.5 m深水航道回淤的物理过程

长江口12.5 m深水航道于2010年3月贯通,发挥了巨大的经济社会效益,但航道回淤问题十分突出。针对航道回淤总量大、时空集中分布于洪季北槽中段最大浑浊带区段的特点,利用北槽洪季沿程大小潮水文测验资料,分析了水沙盐场的时空分布特征和输移规律,揭示了洪季航道回淤集中在北槽中段的主要原因,并提出了涨落潮周期内航道回淤水沙运动的物理过程。

Siltation physical process of the Yangtze Estuary North Passage 12.5 m Deep-draft Channel

The Yangtze Estuary 12.5 m Deep-draft Channel has been available for navigation since March 2010.Despite its enormous economic and social contribution,the problem of back silting is outstanding.The siltation is mainly occurred in the North Passage which crosses the maximum turbidity zone of the Estuary and highly centralized by time and space.The channel middle part is the peak siltation segment.Meanwhile,most of the siltation appears in flood season from June to November.Based on the hydrological data along the North Passage,it is analyzed that the spatial and temporal distribution and transport laws of tidal flow,sediment and salinity in the North Passage.It is revealed that the main reasons of siltation concentration in the channel middle part during flood season,and the sediment transport physical process during flood and ebb tide cycle is put forward.