Investigation of the Fate and Transport Behaviours of Spilled Oil and Development of a State-of-the-Art Canadian Oil Spill Emergency Response Model

溢油的归宿和运输行为的调查以及最先进的加拿大溢油应急响应模型的开发

• 批准号: RGPIN-2014-04045
• 负责人: Niu, Haibo
• 金额: $ 1.6万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=660994
• 关键词: Investigation; Fate; Transport; Behaviours; Spilled

Oil and gas resources are of significant economic importance to Canada's economy. The oil and gas industry in Canada is continuously growing and several major oil exploration and transportation projects from coast to coast have been announced recently. Increased oil and gas activity raises the risk of marine oil spills, which is of significant concern because of the potentially devastating environmental effects. The recent Deepwater Horizon disaster has shown that spills in the deep water environment present extremely difficult response logistics; hence, it is vital that a reliable oil spill model be available to predict the trajectory of oil and help allocate the limited response resources. Unfortunately, our knowledge on the fate and transport behaviour of spilled oil in the marine environment is still very poor, and there is an urgent need to improve existing oil spill models.**This research program is aimed at advancing our understanding of the fate and transport behaviour of spilled oil in the marine environment, and continuously improving our ability to predict the movement of oil and its ultimate fate. Currently, a major barrier in the modeling of subsurface oil spills is the lack of experimental data on oil droplet size distribution, which plays a critical role in determining the ultimate fate of the oil. Therefore, this research will address this lack by conducting meso-scale experiments in a 30 m tank, and releasing oil underwater in a combination of different release rates, dispersant dosage, and oil types. Droplet size will be measured by a combination of three different instruments to capture the whole range of droplets from a few microns to several millimeters. A mathematical model of the distribution will be developed and then integrated with an existing oil spill model to study the effects of the distributions on oil mass balance and trajectory.**Previous studies have shown that high concentrations of suspended sediments in coastal waters can change the behavior of spilled oil significantly, and may lead to potential settling of oil at the seabed. This results from the formation of oil-mineral aggregates whose densities are often higher than that of the ambient water. To accurately predict the fate and trajectory of oil, it is very important to include this process in an oil spill model, but none of the existing models consider this process. Therefore, another objective of this research is to develop a mathematical model to simulate oil-mineral aggregate formation. This will be achieved by extending a single particle type aggregation kinetic model to particles of different densities (oil and sediments) and determining the collision coefficients based on existing experimental data. The new aggregation model will then be incorporated into a general oil spill model to extend its applicability, and to improve the accuracy of its prediction.**The recent Gulf of Mexico oil spill disaster demonstrated the importance of using an integrated operational ocean circulation/oil spill model to provide real time prediction and help to allocate limited response resources. Because Canada currently lacks such a system, it is the objective of this study to develop it by integration of the new advanced oil spill model (using new knowledge on both droplet size distribution and OMA formation) with a well validated, operational, ocean circulation model for the east coast of Canada.**In summary, this proposed research aims to not only advance our knowledge in two key areas of oil spill behavior, but also provide an important operational tool that will help regulatory agencies and spill responders track the oil in real-time and make more effective decisions concerning the adoption of proper oil spill countermeasures.

石油和天然气资源对加拿大经济具有重要的经济意义。加拿大的石油和天然气行业正在不断发展，最近宣布了几个从海岸到海岸的主要石油勘探和运输项目。石油和天然气活动的增加增加了海洋石油泄漏的风险，由于潜在的破坏性环境影响，这是一个值得关注的重大问题。最近的“深水地平线”（Deepwater Horizon）灾难表明，深水环境中的石油泄漏给应急后勤工作带来了极大的困难；因此，建立一个可靠的溢油模型来预测石油的轨迹并帮助分配有限的响应资源是至关重要的。不幸的是，我们对海洋环境中溢油的命运和运输行为的认识仍然很差，迫切需要改进现有的溢油模型。**这项研究计划旨在提高我们对海洋环境中溢油的命运和运输行为的理解，并不断提高我们预测石油运动及其最终命运的能力。目前，地下溢油建模的一个主要障碍是缺乏油滴尺寸分布的实验数据，而油滴尺寸分布对石油的最终命运起着至关重要的作用。因此，本研究将通过在一个30米的水槽中进行中尺度实验，并在不同的释放速率、分散剂用量和油类型的组合下在水下释放石油，来解决这一不足。液滴的大小将通过三种不同仪器的组合来测量，以捕获从几微米到几毫米的整个液滴范围。将建立一个分布的数学模型，然后将其与现有的溢油模型相结合，研究分布对石油质量平衡和轨迹的影响。**先前的研究表明，沿海水域中高浓度的悬浮沉积物可以显著改变溢油的行为，并可能导致石油在海底沉降。这是由于形成的石油矿物聚集体，其密度往往高于周围水的密度。为了准确地预测石油的命运和轨迹，将这一过程纳入溢油模型是非常重要的，但现有的模型都没有考虑到这一过程。因此，本研究的另一个目标是建立一个模拟油气集合体形成的数学模型。这将通过将单一颗粒型聚集动力学模型扩展到不同密度的颗粒（油和沉积物）并根据现有实验数据确定碰撞系数来实现。然后将新的聚集模型纳入一般溢油模型，以扩展其适用性，并提高其预测的准确性。**最近的墨西哥湾溢油灾难证明了使用综合操作海洋环流/溢油模型提供实时预测和帮助分配有限响应资源的重要性。由于加拿大目前缺乏这样的系统，因此本研究的目标是通过将新的先进溢油模型（使用关于液滴大小分布和OMA形成的新知识）与加拿大东海岸的经过验证的、可操作的海洋环流模型相结合来开发该系统。**综上所述，本研究不仅旨在提高我们对溢油行为两个关键领域的认识，而且还提供了一个重要的操作工具，帮助监管机构和溢油救援人员实时跟踪石油，并在采取适当的溢油对策方面做出更有效的决策。