疏浚作业时如何能有效减少水体浑浊,减轻污染一直是人们关注的问题。利用可以分析流体和固体间运动相互作用的数学模型,模拟了环保型抓斗下降过程中的流场情况,并讨论了不同下降方式对流场的影响,提出了能适度控制流场扰动的操作方法。结果表明:抓斗在下降过程中减速能有效减少底面流速,达到抑制底面浑浊的效果,其中抓斗在距离底面3 m处减速为初始速度的1/3能最有效减少水体扰动从而抑制底面浑浊。研究结果可为环保型疏浚施工提供参考。
Abstract
It is essential to effectively reduce the generation of turbidity and pollution in dredging works. In this paper, the flow field during the drop of a sealed grab bucket was simulated with a three-dimensional coupled fluid-structure-sediment-seabed interaction model (FS3M), and the impact of different drop modes on turbidity was discussed in order to propose the optimal drop operation for reducing the turbidity effectively. Numerical results showed that a decrease in the drop speed of the bucket could effectively reduce flow velocity at the bottom, suggesting a reduction in the generation of turbidity from the bottom. In particular, reducing the drop speed of grab bucket to one-third at 3 meters from the bottom is found to be the most effective.
关键词
疏浚作业 /
抓斗 /
下降方式 /
流场扰动 /
数值计算 /
水体浑浊
Key words
dredging /
grab bucket /
drop operation /
flow field disturbance /
numerical analysis /
water turbidity
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] RADERMACHER M,DE WIT L,WINTERWERP J C,et al.Efficiency of Hanging Silt Curtains in Crossflow[J]. Journal of Waterway Port Coastal and Ocean Engineering,2016,142(1),doi:10.1061/(ASCE)WW.1943-5460.0000315.[2] 雷晓玲,彭小兰,黄媛媛,等.抓斗式疏浚设备对底泥污染物释放规律的研究[J]. 环境工程,2015,33(4):97-99.[3] MATSUDA N, GOMYO M, MATSUBARA Y, et al. Research of Flow Generated by Grab Dredging[J]. Proceedings of Civil Engineering in the Ocean, 2005, 21: 331-336.[4] FURUMAKI D, KANAYAMA S. A Numerical Analysis of Generated Flow in Grab Dredging [J]. Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 2012, 68(2): 390-395.[5] NAKAMURA T, FUKUDA S, SUZUKI M, et al. Numerical Analysis of Flow Field During the Drop of a Sealed Bucket and Its Optimal Drop Operation[J]. Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 2015, 71(2): 1203-1208.[6] NAKAMURA T, YIM S C, MIZUTANI N. Three-dimensional Fluid-structure-sediment Interaction Modeling with Application to Local Scouring around a Movable Cylinder[J]. Journal of Offshore Mechanics and Arctic Engineering, 2013, 135(3): 031105-1-031105-9.[7] KANAZAWA T, TSUJIKITA S, NAKAMURA T. Impact on the Flow Field and the Turbidity by Lowering, Hoisting Operation of the Grab Bucket[J]. Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 2016, 72(2): 580-585.
PDF(4396 KB)
