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Numerical Simulation on the Disturbance of Polymetallic Nodule Mining to Marine Sediments

QI Hanchen;WANG Ying;Faculty of Mechanical Engineering &Automation,Zhejiang Sci-Tech University;  
The geotechnical features of polymetallic nodules and marine sediments in China contract mining area has been analyzed.Also the working characteristics of deep-sea polymetallic nodule mining system have been analyzed.Among all disturbances,collecting head and collecting machine have been found make the biggest impact on the marine environment,whose actions make the seabed sediment disturbed,migrated and diffused.According to the technical parameters of the mining machine and its working methods,sediment disturbance model has been established.Fluent software has been used to simulate the disturbance on sediment,DPM model has been used to track particle motion,and the particle concentration has been calculated.The numerical simulation shows:Along with the polymetallic nodule mining,marine sediments are disturbanced into submarine water,form particle clouds behind the disturbance source,then form particle clouds in front of the disturbance source.With the clouds diffuse,the number of clouds lessenes,the sediment concentration in clouds abates,the change of concentration becomes even after 30 min when disturbance source stopped.Which can provide the monitoring parameters for the follow-up seabed mining,and the basis of the monitoring sensors layout.
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