风对珠江河口咸情影响的理想模型研究

Study of the Impact of Wind on Salt Tide of Pearl River Estuaries

珠江口枯水期风向以北风、东北风和东风为主。强风是珠江口咸潮活动的主要扰动因素,也是珠江口附近饮用水源地取淡几率异常减少的主要原因。通过建立理想模型研究发现:无论发生哪个方向的强风,河口、河道咸情均会较无风时严重。对于河口地区,东风和西风造成的盐度增加幅度最高;而对于河道上游地区北风导致的咸潮入侵距离增加幅度最大,其次为南风,接着是东风和西风。

In the dry season, the main wind directions of Pearl River estuaries are north northeast and east. Strong winds are the main reasons of the increase of salt tide strength and the decrease of pumping fresh water time. Through the establishment of an ideal model, the study found that： no matter which direction the strong wind, the salt tide strength of the estuary and river will increase. For the es- tuary, east and west wind caused the highest rate of increase in salinity; and for the river, north wind caused the farthest intrusion of salt tide, followed by the south wind, then the east and west.