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首页> 外文期刊>Estuarine Coastal and Shelf Science >The influence of fish feed pellets on the stability of seabed sediment: A laboratory flume investigation
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The influence of fish feed pellets on the stability of seabed sediment: A laboratory flume investigation

机译：鱼饲料颗粒对海底沉积物稳定性的影响：实验室水槽调查

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摘要

Superfluous fish food settling below fish farms can have a negative impact on the seabed. To aid in the assessment of this impact a series of flume experiments, designed to mimic seabed conditions below a fish farm, was conducted with the aim of examining the effects of fish pellets on the stability of fine sediments. Artificial beds, with varying quantities of fish pellets incorporated both within the sediment matrix and lying on the sediment surface, were allowed to consolidate for different periods of time ranging from 1 to 10 days, and then subjected to erosion experiments. In flume experiments containing fish pellets, a bacterial biofilm developed at the sediment-water interface after a few days. In the control experiments (no fish pellets), a diatom biofilm caused extensive stabilisation of the surface sediment. The erosion experiments showed that the addition of fish pellets reduced the surface erosion threshold by more than 50%. The stability decrease was more pronounced in the experiments with greater amounts of pellets. Evidence of drag reduction due to high suspended sediment concentration was also observed. This phenomenon is discussed and a correction formula is proposed for the effective shear stress experienced by the bed.
机译：多余的鱼类食物沉积在养鱼场下方可能会对海底产生不利影响。为了帮助评估这种影响，进行了一系列旨在模拟养鱼场下海底条件的水槽实验，目的是检验鱼丸对精细沉积物稳定性的影响。允许将具有不同数量鱼丸的人工床（既沉积在沉积物基质中，又沉积在沉积物表面）进行固结，持续时间为1至10天，然后进行侵蚀实验。在含有鱼丸的水槽实验中，几天后，在沉积物-水界面处形成了细菌生物膜。在对照实验（无鱼丸）中，硅藻生物膜引起了表面沉积物的广泛稳定。侵蚀实验表明，添加鱼丸可将表面侵蚀阈值降低50％以上。在使用较大量的颗粒的实验中，稳定性降低更为明显。还观察到由于高悬浮沉淀物浓度导致减阻的证据。对这种现象进行了讨论，并提出了针对床身承受的有效剪切应力的修正公式。

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