论文部分内容阅读
本文根据现场观测资料分析了甬江口拦门浅滩淤积规律及淤积原因,指出浅滩在堤头迴流区内形成。由于迴流区随堤身延长而外移,因此,延长北导堤可以“驱赶”浅滩向外海移动,并使浅滩体积缩小;但滩顶水深并不显著增大。本文进一步分析了影响滩顶水深的各种因素,导出了一个半经验理论公式。最后指出,为了提高滩顶水深,除了延长北导堤外,还应修建丁顺堤使河宽缩窄。根据本文资料,建议北导堤可延长至600米,水道宽度可缩窄至300米。浅滩顶部水深将可达到7.0米。
Based on the field observation data, the sedimentation rules and siltation reasons of shallow bank in Yongjiang estuary are analyzed. It is pointed out that the shoal formed in the dike headback area. As the recirculation zone moves outward with extension of the bank, extending the north embankment can “drive away” the shoal to the open sea and reduce the shoal’s volume; however, the depth of the beach does not increase significantly. This paper further analyzes various factors that affect the water depth of the beach and derives a semi-empirical theoretical formula. Finally, it is pointed out that in order to increase the water depth of the beach, in addition to extending the north embankment, the Dingshutai should be constructed to narrow the river width. According to the information in this paper, it is suggested that the North Embankment can be extended to 600 meters and the width of the waterway can be narrowed to 300 meters. Shoal top water depth will reach 7.0 meters.