北仑电厂码头改扩建工程潮流泥沙数值模拟

Numerical modeling of tidal current and sediment of reconstruction and extension projects of wharf in Beilun power plant

运用平面二维水流泥沙数学模型,分别建立了包含金塘水道大范围以及拟建工程区小范围水域的潮流泥沙场,其中大范围模型为小范围模型提供边界条件。计算结果表明:改扩建工程使周边局部海域流场减弱,但影响范围有限,流场变化主要集中于改扩建码头西侧及其后沿驳船码头港池开挖区水域,涨、落急流速变幅在13.3%以内,流向变化值小于8.3°。码头后沿的浅滩区是主要泥沙淤积区,改扩建码头前沿平均淤强约0.76m/a,淤积量2.5万m3/a,驳船泊位区平均淤强1.42m/a,淤积量5.9万m3/a。鉴于岸坡浅滩仍是主要的淤积区,建议保持定期疏浚,以免淤积前伸对驳船港池和码头前沿造成不利影响。

According to the measured data,a 2-D numerical model of tidal current and sediment was adopted.Then a large range of tide and sediment field including Jintang channel and a small range including engineering area were established,and the large one provided the boundary condition for the small one.The results show that the current is weakened in local sea area after reconstruction and extension projects,but the whole tide flow field changes little.The flow field changes are mainly concentrated in the west and lagging edge of the wharf,while the change range of velocity is within 13.3% ,and the change of current direction is less than 8.3°.Sediment deposition mainly happens in the shoal area near the lagging edge of wharf.The average siltation intensity in the wharf apron is about 0.76 m/a, sedimentation amount is 25 000 m3/a,and the average siltation intensity in barge bed is about 1.42 m/a, sedimentation amount is 59 000 m^3/a.In view of the serious deposition of the nearshore shoal,the regular dredging will continue to be required in order to avoid the adverse effect of siltation.