连云港外海含沙量推求及航道回淤预测

Prediction of Sediment Concentration in Open Sea and Siltation in Approach Channels to Lianyungang Port

目前国内在研究淤泥质海岸航道回淤时,通常仅有近岸含沙量的实测资料,而外海含沙量较难获得。为此,建议可以利用实测的航道淤积、近岸含沙量等资料,根据刘家驹的航道回淤计算公式,近岸率定淤积系数,反推外海泥沙含量,据此进行航道回淤预测。经过连云港7万吨级进港航道验证,计算的航道回淤与实测值吻合较好,在此基础上,对拟建的连云港15万吨级航道回淤进行了预测。研究结果表明,所提出的方法切实可行,计算结果合理可信,可以作为相似条件下航道泥沙回淤计算的参考。

In domestic researches on the silting intensity in approach channels on muddy coasts, measured data of near-shore suspended sediment concentration （SSC） can be easily obtained but it is often quite difficult to acquire the SSC in the open seas. It is proposed that the siltation in approach channels can be predicted by the application of Liu Jiaju＇s equation for siltation in waterways and the SSC in the open seas is derived with the calibration of the near-shore empirical coefficient on the basis of the measured data of siltation in channels and near-shore sediment concentration. The calculated siltation in the approach channels fitted well the measured data as compared with the verification measurements made on the approach channels for ships up to 70 000 dwt in Lianyungang Harbour, on the basis of which, a prediction was made of siltation in the approach channels proposed to build for ships up to 150 000 dwt in Lianyungang Port. The result of the research showed that the proposed method of prediction is practicable and the calculated results are rational and authentic, which may be of reference for the calculation of siltation in approach channels under similar conditions.