为定量评估钦州湾三墩公路东侧海域清淤对当地水动力环境以及泥沙输运特性的影响,基于平面二维数学模型开展波流耦合作用泥沙输运特性研究,在验证计算结果可信的条件下,探讨了工程海域疏浚对水流特性分布、纳潮量变化以及工程后年回淤量的影响.分析结果表明:清淤将导致工程海域的海流流速平均降低4～8 cm/s,局部流速降低达到30 cm/s,但是对该区域纳潮量增加贡献幅度有限,仅微幅增加0.065%;由于清淤导致流速降低,使得工程海域大部分区域呈淤积状态,平均回淤强度达2～4 cm/a,近岸区域回淤强度达8～10 cm/a,局部区域由于流速增大,冲刷强度达到每年1～2 cm.
Study on Sediment Transport Characteristics under Wave-Current Coupling in Qinzhou Bay
In order to quantitatively evaluate the impact on local hydrodynamic environment and sediment transport characteristics by sea area dredging works east to Sandun Highway in Qinzhou Bay,the sediment transport characteristics under wave-current coupling was studied by using 2D plane mathematical model.On the premise of reliable calculation results,a research was carried out for the impact of dredging engineering sea area on the distribution of flow characteristics,the change of tidal accommodating capacity and annual siltation volume after the construction had been completed.The analysis results show that the dredging works will lead to the average decrease in sea current velocity in the engineering sea area by 4～8 cm/s,and the decrease in local flow velocity by 30 cm/s,but only a little increase in tidal accommodating capacity in the region by 0.065%.The decrease of flow velocity resulting from dredging may produce siltation in most of engineering sea area,with the average silting intensity of 2～4 cm/a,and inshore silting intensity of 8～10 cm/a.In addition,an increased flow velocity in local sea area may lead to the intensity of scouring at 1～2 cm/a.
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