一、概述建国以来,大量的自然感潮河道上都修建了挡潮节制工程,于是,原有感潮河道的情况起了性质上的变化:感潮河段仅剩下从节制工程至海口一段。各河道长短不一,这些感潮河段,我们称之为港道,其中的主过水断面又称之为港槽。其流量的变化很大程度上取决于人工因素的作用。这些变化的因素加上潮汐动力作用,又使得这些港道或其中的港槽产生新的危害性变化,并随时可能破坏束水港堤(港道两边的堤防),进而破坏已分开的水系,威胁堤内人民生命财产的安全。港槽的飘移。主要与港槽的长短、潮汐动力的强弱、上游来水量的变化有关。据调查,近海感潮河道中港槽的飘移较为剧烈,或左岸冲刷右岸淤积或相反,这与潮汐动力的方向有关。在盐城市基本上是弶港以南为北冲南 I. Overview Since the founding of the People’s Republic of China, a large number of natural tidal channels have been constructed with tidal flats control projects. As a result, the original tidal channels have changed in nature: only the first section from the temperance project to the Haikou . The length of the river courses, these tidal reaches, which we call the harbor, of which the main cross-section also known as the harbor. The change in its flow depends largely on the role of artificial factors. These changing factors, combined with tidal dynamics, in turn cause new dangerous changes in these harbors or in their troughs and may at any time undermine the bund of bunds (the embankments on either side of the harbors) and thus destroy the separated water systems, Threatening the safety of people’s life and property within the dike. The drift of the trough. Mainly related to the length of the trough, the strength of the tidal power, and the change of water inflow in the upper reaches. According to the survey, the tidal drift in the tidal channel near the sea is more drastic, or the left bank scour the right bank for siltation or vice versa, which is related to the direction of tidal power. Yancheng is basically south of Hong Kong North Punch South