Impacts of suspended sediment on oil spill in macro-tidal turbid waters: An example in Zhoushan Archipelago

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Li Li , Yixuan Feng , Xin Chen , Zhiguo He , Huiqun Wang , Yuezhang Xia
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Abstract

The concentration of suspended sediment was found to impact the characteristics and dynamics of oil spills, as indicated by the rate of formation of oil particle aggregates (OPA). The transport and fate of oil spills in the Zhoushan Archipelago were simulated by using a combined hydro-sediment-oil spill model. We studied the impacts of suspended sediment on oil spills in macro-tidal turbid archipelagic seas. The model results indicated that the formation of OPAs is affected by the concentration of suspended sediment, energy dissipation rate, oil density, and hydrodynamics (winds and tides). An increase in oil density accelerated the formation of suspended buoyant OPAs but suppressed the formation of negatively buoyant OPAs. Winds and tides affected the rate of OPA formation by changing the energy dissipation rate and the concentration of suspended sediment, respectively. Oil spill dispersion is impacted by winds, tides, and oil spill location, through the changes in the formation of both suspended buoyant OPAs and negatively buoyant OPAs. Although strong winds promote the formation of OPAs and tend to reduce oil content they also potentially enlarge the oil film (depending on tidal currents). OPAs form more readily in oil spills in main tidal channels, likely due to the high concentration of suspended sediment and high degree of mixing generated by strong currents. The findings of this study provide theoretical foundations for the studies of oil spills and coastal management in turbid coastal zones.

大潮汐浑浊水域悬浮泥沙对溢油的影响——以舟山群岛为例
研究发现,悬浮沉积物的浓度会影响石油泄漏的特征和动力学,如石油颗粒聚集体(OPA)的形成速率所示。采用水-沉积物联合溢油模型模拟了舟山群岛溢油的输移和归宿。我们研究了巨潮浑浊群岛海域悬浮沉积物对石油泄漏的影响。模型结果表明,OPAs的形成受到悬浮泥沙浓度、能量耗散率、油密度和流体动力学(风和潮汐)的影响。油密度的增加加速了悬浮浮力OPA的形成,但抑制了负浮力OPA。风和潮汐分别通过改变能量耗散率和悬浮泥沙浓度来影响OPA的形成速率。通过悬浮浮力OPA和负浮力OPA的形成变化,漏油扩散受到风、潮汐和漏油位置的影响。尽管强风促进了OPA的形成,并倾向于降低石油含量,但它们也可能扩大油膜(取决于潮流)。OPA在主要潮汐通道的石油泄漏中更容易形成,这可能是由于高浓度的悬浮沉积物和强洋流产生的高度混合。这项研究的结果为研究浑浊海岸带的石油泄漏和海岸管理提供了理论基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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