长江福山倒套河床演变分析

运用大量实测水下地形及岸线利用资料，对福山倒套成因，演变及发展趋势做了计算分析。结果表明，福山倒套上段和倒套中下段均处于淤积阶段。其中倒套下段河床近徐六泾节点主槽，河道较深且具有使河床处冲淤平衡状态的水流条件；倒套中上段河道较浅，水流滞缓，淤涨较快。利用平面二维水流模型模拟预测结果表明，倒套落潮水动力场受其上部串沟支配，上部串沟的淤涨，使倒套上段流速进一步减小，淤积加快。此外，提出了相应的整治措施,以保证福山倒套河势稳定。

Analyses of Fushan Watercourse River-Bed Evolvement of the Yangtze River

This paper analyzes the formation, evolvement and the development trend of Fushan watercourse by using plenty of data of underwater contour and the water front exploitation. It is proved that both the upper reach and the lower reach of the Fushan watercourse have been silting. And the lower reach watercourse close to the main channel of Xuliujing is deep and has the flow condition to keep the riverbed equilibrium of scouring and deposition; the upper and middle reaches of the Fushan watercourse have shallow riverbed, slow flow rate and fast silting rate. By using a 2--D plane flow numeric model, it is found that the hydrodynamic field of Fushan watercourse is determined by the status of the upper reach. If the upper reach is jammed, the flow rate is further decreased and the silting rate is accelerated. Moreover, this paper presents .some cor responding steps to keep the river regime of Fushan watercourse stable.