【摘要】 <正> 伶仃洋汇集虎门、蕉门、洪奇沥和横门等珠江水道的来水、来沙,使海区内淤积日甚,浅滩广袤。东、西两航道把浅滩分为东滩、中滩和西滩。 西滩位于伶仃洋西侧,在蕉门、洪奇沥和横门的口外,北起蕉门口的鸡婆沙,向南有万顷沙尾的沙仙尾滩,横门滩,进口浅滩,直到淇澳岛北端的滩地。南北延伸达30余公里,东西宽约10余公里。这片滩地至今尚在发展中,前缘已直逼西航道(即伶仃航道),使西航道变窄变浅,自然水深不足10米。更多还原

【Abstract】 In this paper the mechanism of the trough development at the west shoal in Lingding Yang is discussed in accordance with the aspects of tidal level, tidal current, gradient of stage, Coriolis force and lateral momentum balance.It is considered that combined forces of the tidal current and the runoff coming from the distributary mouths of Zhujiang River govern the dominant trend of the trough development in the west shoal. In ebb period, the lateral gradient of stage is heightened that can contribute to the development of the lateral distributary trough, which is supposed to be formed when flood peaks break through the shoal. So, it is formed in a mutant or accident manner, but has a "discharging function".更多还原