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结合河段水沙和地质条件 ,对福姜沙水道进行河床演变分析 ,总结出河段演变规律 ,并对演变趋势进行了分析。福姜沙河段属平原型感潮河段 ,水流主要动力为落潮流。河段河势与两岸地质地貌条件有关 ,1910年左右才演变为现有河势。福姜沙河段演变受上、下游演变的影响 ,尤其是受上游河床演变的影响。河段内多汊并存的局面是必然的。福姜沙及双锏沙的存在与本河段地质地貌条件分不开 ,这是水流与河床长期相互作用的结果。福姜沙北汊宽浅顺直 ,不同径流情况下 ,水流动力轴线摆动范围较大。北汊主流动力轴线的南北摆动与下段沙体演变是相应的 ,且相互影响。人类的护岸工程对本河床演变有一定的控制作用 ,使本河段河势得到基本控制 ,同时特大洪水对本河段的造床影响也越来越弱。
Based on the analysis of water-sediment and geological conditions in the reach of the river, the evolution of riverbed in Fukengsaisha is summarized, and the evolution of the river reach is summarized. The evolution trend is also analyzed. Fu Jiang Shahe section is a tidal flat river, the main driving force for the current tide flow. The river section of the river is related to the geology and geomorphology of both sides of the Straits, and only evolved into the existing river regime around 1910. The evolution of the Fujiang Shahe section is affected by the evolution of the upper and lower reaches, especially by the evolution of the upper reaches of the riverbed. Multiple coexistence within the river is inevitable. The existence of the Fujiang Ginger and Shuangjisha is inseparable from the geology and geomorphology of this section, which is the result of the long-term interaction between water flow and riverbed. Fu Jiang Sha Beibei wide shallow straight, different runoff cases, water flow axis swing larger. Beibei mainstream axis of the north-south swing and evolution of sand bodies corresponding to the next paragraph, and mutual influence. The human bank protection project has a certain control over the evolution of the river bed, which has basically controlled the river regime and the impact of the extra-large flood on the riverbed formation has become increasingly weaker.