Submesoscale currents from buoyant seismic streamers (SCR-BAS)

来自浮力地震拖缆的亚尺度流 (SCR-BAS)

• 批准号: NE/L008246/1
• 负责人: Emily Shuckburgh
• 金额: $ 5.35万
• 依托单位: British Antarctic Survey
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FL008246%2F1
• 关键词: Submesoscale; currents; buoyant; seismic; streamers

We propose a 9-month project as an extension of an existing joint project between British Antarctic Survey and Schlumberger Gould Research. Schlumberger's vessels conduct seismic surveys of the seabed and underlying geography at many locations around the globe to assess offshore oil and gas reserves. The vessels tow behind them an array about 1 km in width of a dozen cables known as "streamers", typically 6-10 km long (though only 5 cm in diameter). The streamers hold many thousands of sensors (usually hydrophones) to detect the reflected signal from a seismic source. The streamers also hold a number of steering devices, which can be used to actively modify the position of the streamer through the water. In this project we do not use the seismic data recorded by the hydrophones but instead the physical information of the streamers, such as position, tension and steering forces from which ocean current models can be derived (the seismic data of ocean density may however prove useful for follow-on studies to improve our understanding of submesoscale processes).To-date a forward model has been developed and tested to estimate the motion of streamers as they are towed through an ocean current field. Here an inverse model will be developed to take recorded information related to the streamers, in particular the tension at the head end and the velocities and angles along the cable, and to deduce the horizontal, divergence-free currents along the cable, thus providing velocity information at the submesoscale (approximately 1-10 km in the horizontal). The project will refine, validate against independent observations and implement this inverse model. Components of the project will directly build off NERC-funded work conduced as part of a number of past and present projects. The results will be of immediate benefit to Schlumberger as they will provide information for expected currents in the area with which to plan repeat surveys and they will also feed into a number of NERC research projects investigating the role of submesoscale processes in the ocean.

我们提出一个为期9个月的项目，作为英国南极调查局和斯伦贝谢古尔德研究所现有联合项目的延伸。斯伦贝谢的船只在全球许多地方进行海底和地下地理地震调查，以评估海上石油和天然气储量。这些船只拖着一排大约1公里宽的电缆，这些电缆被称为“拖缆”，通常长6-10公里（尽管直径只有5厘米）。拖缆上装有数千个传感器（通常是水听器），用于探测来自震源的反射信号。拖缆还装有许多转向装置，可用于主动调整拖缆在水中的位置。在这个项目中，我们不使用水听器记录的地震数据，而是使用拖缆的物理信息，如位置、张力和导向力，这些信息可以推导出洋流模型（然而，海洋密度的地震数据可能对后续研究有用，以提高我们对亚中尺度过程的理解）。到目前为止，已经开发并测试了一个正演模型来估计拖缆在洋流场中拖曳时的运动。在这里，将开发一个逆模型，以获取与拖缆相关的记录信息，特别是前端的张力和沿电缆的速度和角度，并推断沿电缆的水平、无发散电流，从而提供亚中尺度（水平约1-10公里）的速度信息。该项目将对独立观测结果进行细化、验证并实现该逆模型。该项目的组成部分将直接建立在nerc资助的工作基础上，这些工作是过去和现在一些项目的一部分。这些结果将给斯伦贝谢带来直接的好处，因为它们将为该地区的预期洋流提供信息，以便计划重复调查，它们还将为NERC的一些研究项目提供信息，这些项目将调查海洋中尺度过程的作用。

项目成果

Inferences of ocean currents from seismic streamer position data

从地震拖缆位置数据推断洋流

• DOI: 10.1111/1365-2478.12479
• 发表时间: 2016
• 期刊: Geophysical Prospecting
• 影响因子: 2.6
• 作者: Grant T

The vertical shape of a buoyant acoustic streamer between depth control units

深度控制单元之间的浮力声学拖缆的垂直形状

• DOI: 10.1016/j.oceaneng.2015.06.004
• 发表时间: 2015
• 期刊: Ocean Engineering
• 影响因子: 5
• 作者: Grant T