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为了认识不同径流与潮流博弈引发的河口流动特性的变化规律,采用数学模型和大型河口物理模型耦合的方法,系统研究了九龙江下游北溪浦南水文站、西溪郑店水文站以下广大河口区域的流场及水位场的变化。结果表明,天然状态下,当九龙江径流为15 540、2 896、374m3/s且河口恰遇典型日天文大潮时,潮流界分别位于甘文尾后的红树林海洋自然保护区、南北中港以及西溪河道的渡头村和北溪河道的科坑村,径流变化可使潮流界上溯约35km;不同径流条件下河口三角洲的南港、中港、北港行洪和纳潮的分流比及流动特性发生显著变化;九龙江葫芦状河口及厦门岛周边存在径流对潮位影响的分界区,厦门岛北支口门区域受九龙江北溪和西溪径流影响很小。
In order to understand the changing regularity of the flow characteristics of the estuary caused by different runoff and tidal current games, a mathematical model and a large-scale estuary physical model were used to study the relationship between the Beixi Punan Hydrological Station in the lower reaches of Jiulong River and the estuaries below the Xidi Zhengdian Hydrological Station Regional flow field and water level changes. The results show that in the natural state, when the Jiulongjiang runoff is 15 540,2 896,374 m 3 / s and the estuaries coincides with the typical astronomical tide, the tidal current boundaries are located respectively in Mangrove Marine Nature Reserve, And the stream village of Xixi River and the village of Kekeng of Beixi River. The runoff changes can make the tidal current rise about 35km. The diversion ratio and flow characteristics of flood discharge and wet tide of Nangang, Zhonggang and North Port in estuarine delta under different runoff conditions are significant There was a demarcation zone of influence of runoff on the tide level in the vicinity of the gourd-shaped estuary of Jiulong River and Xiamen Island. The area of the north branch of Xiamen Island was less affected by Beixi and Xixi runoffs in Jiulong River.