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In order to explore disturbance of seabed sediment during mining of polymetallic nodules, a pool experiment was carried out to scour sediment by a waterjet from polymetallic nodules collector. Variation of gully depth, and migration and diffusion regulation of sediments were investigated in the experiment by setting the waterjet at different speed, with nozzle at different height from sediment, and collector at different traveling speed. The results show that the collecting process of polymetallic nodules brings scour to both particles and blocks of sediment, leading to uneven surface of the gully. Then, disturbed sediment migrates and diffuses through upper plume flow and bottom gravity flow.

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为探究深海多金属结核开采过程对海底沉积物的扰动情况，开展了不同射流速度、不同离底高度、不同行进速度条件下多金属结核采集头射流冲刷沉积物水池实验，探究了冲沟深度变化和沉积物迁移扩散规律。结果表明，多金属结核采集过程不仅冲刷沉积物颗粒，也会冲刷沉积物块，导致冲沟表面凹凸不平；沉积物被扰动后，通过上层羽状流和底层重力流形式迁移扩散。

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张东宽（1995—），男，河南鹤壁人，硕士研究生，主要研究方向为深海矿产资源开发技术。

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张东宽（1995—），男，河南鹤壁人，硕士研究生，主要研究方向为深海矿产资源开发技术。

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