连云港抛泥区抛泥弃土的流失及其对外航道回淤的影响

Dispersion of Waste Mud in Dumping Ground of Lianyungang Harbour and Its Effects on Siltation in Outer Navigable Channel

连云港羊窝头抛泥区由抛泥弃土形成的水下堆积体,主要受波浪和潮流作用,一部分在抛泥期间被运移,另一部分在波浪掀动后被潮流搬运。抛泥区93％的弃土是在抛泥期间的4～10月被运移流失。当每年有300万立米的弃土抛于羊窝头抛泥区,它可以使东口门水体含沙量增加20％,在连云港外航道5+000内淤积厚度增加0.21米,这个淤积强度是很小的.

Submerged depositional morphology was formed after waste mud was dumped into Yangwotou dumping ground in Lianyungang Harbour.Washing away of waste mud is controlled mainly by waves and tidal currents.It is washed away partly during dumping time,and the most,resuspended by waves,is transported and dispersed by tidal currents.93% of waste mud in Lianyungang Harbour is dispersed during dumping periods from April to October.When the annual quantity of waste mud dumped in Yangwotou dumping ground reaches up to 3 million m^3,the yearly sediment concentration at East Entrance increases 20%,and siltation layer increases about 0.21m within the navigational channel of 5+000 in Lianyungang Harbour.The siltation rate,however,is very small.