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New industry consortia with novel laboratory facilities that forms a UK national centre of excellence in submarine geohazards research

拥有新颖实验室设施的新行业联盟形成了英国国家海底地质灾害研究卓越中心

基本信息

批准号：
NE/L008130/1
负责人：
Mattieu Cartigny
金额：
$ 10.09万
依托单位：
NATIONAL OCEANOGRAPHY CENTRE
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FL008130%2F1
关键词：
New industry consortia novel laboratory

项目摘要

We propose to use these 'pump priming' funds to initiate an ambitious new industry consortium and UK centre of excellence for research into marine geohazards. Funding is sought specifically to: 1) set up an experimental laboratory with a set of novel sensors for imaging dense sediment flows, and 2) develop initial links with key industry stakeholders (e.g. FUGRO GeoConsulting Ltd).NOC has a strong submarine geohazards group whose work is based mainly on field observations; for instance it is leading a £2.3M NERC Consortium of tsunami-landslide hazards. It has just been awarded a £850k NERC grant to monitor active submarine flows in Monterey Canyon offshore California. Here we seek funding to develop a new experimental laboratory to test hypotheses posed by field observations.Full-scale flow observations in the field have recently confirmed an earlier hypothesis, which suggest that dense near-bed layers with high sediment concentrations often form a key part of turbidity currents. These dense layers are the most poorly understood and hence contentious part of turbidity currents, because most techniques can only image within the dilute top part of the flows. Dense near-bed layers are, however, important for geohazard analysis because their high density and basal position can exert large forces on infrastructure located close to the bed. The lateral loads they impose may result in displacement of pipelines, or in severe cases result in full bore rupture. The consequences may include economic loss, environmental effects and reputational damage to the operator. We now need to understand how these dense near-bed layers form and evolve, and what their impact is to exerted pressures and forces.Although previous experiments have successfully measured velocities within dense near-bed layers, sediment concentration measurements have so far not been possible within these layers due to their high sediment content. Here we seek funds to apply a new method of sediment concentration measurements based on Electrical Resistivity Tomography (ERT). ERT techniques are able to measures sediment concentration contrasts to characterise sedimentary reservoirs in the subsurface. This technique is not limited by sediment concentration and preliminary numerical simulations have shown that this technique can resolve sediment concentration profiles in dense near-bed layers of turbidity currents. We will use the novel ERT, in combination with velocity measurements to measure for a first time a combined velocity and sediment concentration profile through dense near-bed layers. Such simultaneous measurements will help to understand: i) what the maximum thickness of these dense layers can be, ii) how much sediment they are able to transport into the ocean, and iii) how large the impact of these layers can be on submarine pipelines.The second aim of this proposal is to develop links with FUGRO GeoConsulting Ltd. FUGRO performs risk assessments on marine geohazards for numerous oil and gas companies. As part of this assessment, numerical modelling provides a quantitative expression of likely impact and consequence to the integrity of seafloor structures. Flow densities and velocities of near-bed layers form vital inputs in these models. Currently inferred densities and velocities are required as model input, which are not well calibrated, and gross assumptions must be made. Therefore, this experimental work will provide useful direct input to improve the current model assumptions. The West Nile Delta will be used as a case study to show the direct impact of the experiments on real-world risk assessment calculations.The grant will also be used to transfer people and knowledge between FUGRO and NOC. This transfer will take place during a series of 3 meeting both at NOC and at FUGRO. Additionally two FUGRO consultants will spend 3 weeks at NOC to ensure a smooth transfer of knowledge from the experiments into the industry risk assessments.

我们建议使用这些“泵启动”资金，启动一个雄心勃勃的新的行业联盟和英国卓越中心的研究海洋地质灾害。寻求资金的具体目的是：1）建立一个实验室，配备一套用于成像密集沉积物流的新型传感器，2）与主要行业利益相关者（例如FUGRO GeoConsulting Ltd）建立初步联系。NOC拥有强大的海底地质灾害小组，其工作主要基于实地观察;例如，它正在领导一个价值230万英镑的海啸-滑坡灾害NERC联盟。它刚刚获得了85万英镑的NERC拨款，用于监测加州近海蒙特雷峡谷的活跃海底水流。在这里，我们寻求资金，以开发一个新的实验室，以测试所提出的假设实地observations.Full-scale流观测在现场最近证实了早期的假设，这表明，密集的近床层与高泥沙浓度往往形成浊流的关键部分。这些致密层是浊流中了解最少的部分，因此也是最有争议的部分，因为大多数技术只能在浊流的稀释顶部成像。然而，密集的近床层对于地质灾害分析是重要的，因为它们的高密度和基底位置可以对靠近床的基础设施施加很大的力。它们施加的横向载荷可能导致管道移位，或者在严重的情况下导致全径破裂。后果可能包括经济损失、环境影响和对经营者的声誉损害。我们现在需要了解这些密集的近床层是如何形成和演变的，以及它们对施加的压力和力的影响。虽然以前的实验已经成功地测量了密集近床层内的速度，但由于这些层的泥沙含量很高，迄今为止还无法测量泥沙浓度。在这里，我们寻求资金，应用电阻率层析成像（ERT）的基础上泥沙浓度测量的新方法。ERT技术能够测量沉积物浓度与地下沉积物储层的对比。该技术不受泥沙浓度的限制，初步的数值模拟表明，该技术可以解决泥沙浓度分布在密集的近床层的浊流。我们将使用新的ERT，结合速度测量，测量第一次通过密集的近床层的速度和泥沙浓度的组合剖面。这种同步测量将有助于了解：i）这些致密层的最大厚度是多少，ii）它们能够向海洋输送多少沉积物，iii）这些层对海底管道的影响有多大。本提案的第二个目的是与FUGRO GeoConsulting Ltd.建立联系。作为这项评估的一部分，数字建模提供了对海底结构完整性可能产生的影响和后果的定量表达。在这些模型中，近床层的流动密度和速度构成了重要的输入。目前推断的密度和速度需要作为模型的输入，这是没有很好地校准，必须作出粗略的假设。因此，这项实验工作将提供有用的直接输入，以改善目前的模型假设。西尼罗河三角洲将被用作案例研究，以展示实验对现实世界风险评估计算的直接影响。这笔赠款还将用于FUGRO和NOC之间的人员和知识转移。这一转移将在NOC和FUGRO的一系列3次会议期间进行。此外，两名FUGRO顾问将在NOC工作3周，以确保将实验知识顺利转移到行业风险评估中。