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本文主要讨论了汕头港外拦江沙及其航道洄淤的物质来源。认为外拦江沙的形成和消长,与新津溪输出泥沙以及该处的海洋动力因素的作用密切相关。外拦江沙的物质来源主要是新津溪的入海泥沙,而对浚深航道来说,待狎金浅滩的泥沙本身就是它的直接物质来源。外拦江沙在自然状况下处于准动态平衡,淤积缓慢,但一经浚深,便会出现严重的淤积。为维持—5.5m以下的航道,估计洄淤疏浚量最大为50—60×10~4m~3a。
This paper mainly discusses the source of sediment of Shantou Port outside the river and its siltation. It is considered that the formation and growth of the outer barrage are closely related to the export of silt from Xinjin Creek and the marine dynamic factors there. The material source for the outer barrage is mainly the silt entering the Xinjin Creek, and for the deep channel, the silt to be bumped is itself a direct source of material. Outside the barrier of Jiang Sha in the quasi-dynamic equilibrium under natural conditions, siltation slowly, but once deep, there will be serious siltation. In order to maintain the waterway below -5.5m, it is estimated that the maximum volume of dredging and silting is 50-60 × 10 ~ 4m ~ 3a.