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本文利用本序列上篇论文建立的理想河口数值模式 ,研究径流量和海平面上升对河口环流和盐水入侵的影响。在径流量增大的情况下 ,口门内表层向海的流速增大 ,底层向陆的密度流减弱 ,滞流点下移。口门外侧向口门的密度流增大 ,上升流趋于增强。口门内盐水入侵减弱 ,口外盐度减小、冲淡水扩展范围增大。在口门上游北岸底层盐度下降明显 ,口门处南岸表层盐度下降明显。径流量变化对盐水入侵影响十分巨大。在海平面上升的情况下 ,拦门沙区域向陆的密度流增强 ,滞流点上移 ,表层向海的流动增大。口门内盐水入侵增强 ,口外盐度增大 ,冲淡水扩展范围减小。海平面上升对盐水入侵影响十分明显 ,北岸底层盐度增大尤为特出。
In this paper, the ideal estuary numerical model established in the previous paper is used to study the effects of runoff and sea level rise on estuarine circulation and salt water intrusion. In the case of increased runoff, the velocity of the inner surface of the hatchway to the sea increases, the density of the bottom landward direction weakens, and the stagnant point moves downward. Outer door to the mouth of the density flow increases, the upward trend tends to increase. The saltwater intrusion in the door weakened, the salinity of the mouth decreased, and the range of red water expansion increased. In the upper reaches of the mouth of the North Shore salinity decreased significantly, the southern gate of the mouth of the salinity decreased significantly. Changes in runoff have a huge impact on salt water intrusion. In the case of sea level rise, the density flow to the land in the barricade area is enhanced, the stagnation point is moved up, and the flow from the surface to the sea is increased. The saltwater intrusion inside the door is enhanced, the salinity outside the mouth is increased, and the range of the diluted water is reduced. The impact of sea level rise on saltwater intrusion is very obvious, and the increase of salinity on the north shore is especially outstanding.