靖江边滩演变水动力特性分析

对近年来靖江边滩周期性切割发生的位置、切割时的规模和切割体的大小进行梳理分析,并对1966年以来已发生的12次较大规模切割时机和切割流量进行重点研究。结果表明:洪季和枯季均有可能出现切割。洪季落潮切割时上游径流38 700~54 100 m³/s,平均47 000 m³/s;枯季涨潮切割时上游径流11 800~23 700m³/s,平均17 000 m³/s;心滩下移速度1.0~1.8 km/a。为此,可加强易切割流量时地形观测,预估下移心滩进入航槽的时间,提前配置疏浚设备,对航道疏浚维护具有重要的意义。

Hydrodynamic characteristics of Jingjiang beach evolution

The periodical cutting location of Jingjiang beach in recent years and the cutting scale of the sand body and the scale of the downward-moving central bar are analyzed,and the time and discharge of 12 large-scale cuttings that occurred since 1966 are studied. The result shows that cutting may occur both in flood season and dry season,the cutting discharge during low tide in the flood season is between 38 700 ~ 54 100 m³/s( 47 000 m³/s average),and the cutting discharge during high tide in the dry season is between 11 800 ~ 23 700 m³/s(17 000 m³/s average). We may strengthen the terrain observation when reaching the cutting discharge,predict the channel crossing time, and allocate the dredging equipment in advance to reduce the impact of siltation on channel operation,which is of great significance to the maintenance and dredging of the channel.