连云港港15万吨级航道回淤观测研究

Observation and analysis of siltation in 150 000 DWT channels at Lianyungang port

开展了连云港港15万吨级航道实际回淤观测,结合水文泥沙条件,对常年和大风天的回淤特征和影响因素进行了研究。研究表明,连云港港15万吨级航道年回淤量约为607×104 m3,与15万吨级航道初步设计预测值基本相近;回淤分布与7万吨级航道相似,最大淤强位于外1段,约为1.86 m/a。大风天航道回淤呈现3阶段变化特征,具有先淤后恢复的特征,风后的局部淤积是暂时的,需要疏浚的实质性回淤很小。依据15万吨级航道实测回淤特征,建议30万吨级航道宜结合港区在东西连岛口门建设防波堤,以减小回淤峰值区段淤强。

Actual siltation observation of 150 000 DWT channel at Lianyungang port is carried out.Combining with the hydrologic and sediment data,we study siltation characteristics on perennial and windy days and influential factors.It is found that the siltation of 150 000 DWT channels is about 6 070 000 m3 per year,which is similar to the predictive value of the preliminary design phase.The distribution of siltation is similar to that in 70 000 DWT channel,the maximum siltation intensity of about 1.86 m/a locates at the outer section 1.The windy day siltation is characterized by 3 stages＇ variation and recovery later after primary siltation.The local siltation after wind is temporary,and the siltation needing dredging is very little.Based on the siltation characteristics of 150 000 DWT channel,we suggest that the breakwater at Liandao island entrances should be constructed during construction of the 300 000 DWT channel to reduce siltation at the peak section.