Assessing dynamic seabed change on the UK continental shelf

评估英国大陆架的动态海底变化

• 批准号: 2302686
• 金额: --
• 依托单位: University of the Highlands and Islands
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2302686
• 关键词: Assessing; dynamic; seabed; change; UK

Understanding the rate and extent of change on a dynamic seafloor is an essential requirement for the offshore construction industry. During the lifetime of any structure placed on the seafloor sediment movement can lead to either burial or scouring that will necessitate an additional engineering solution to ensure the structure's long term integrity. The continental shelf contains sediment in both mobile and static condition. Many recognised mobile bedforms on the shelf could be relict, forming during the isostatic readjustment of the shelf after the last glaciation and present no risk. Conversely the rate of transport of modern, active dunes is difficult to ascertain without costly repeated surveys. The recent availability of publicly accessible, regionally extensive, high-resolution seabed mapping data (e.g. multibeam sonar surveys) from the UK Data Archive Centres provides an opportunity to assess the state of sediment stability across a number of different geographical situations.. The project will adopt a case study approach of sites which might present a risk to the offshore construction industry and will include mobile bedforms (dunes), biogenic reefs (cold water corals) and wrecks. Where data sets have been collected over different time periods rates of change will be calculated in order to estimate the scale, rate and extent of change. Pilot studies exist such as Games & Gordon (2015) Study of sand wave migration over five years as observed in two windfarm development areas, and the implications for building on moving substrates in the North Sea. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, doi:10.1017/S1755691015000110.However no comprehensive broad-scale mapping study has been attempted to quantify the rate and extent of seafloor change on the UK continental shelf. The proposal was first developed by Peter Watson at SSE and numerous cable-route datasets exist which would be extremely valuable to compare to previous national seabed mapping campaigns. The project aims to deliver mapping outputs, a number of seafloor 'change' maps in key regions (mobile bedforms, biogenic reefs, wrecks). Predicted change maps quantifying rate of change at a defined timescale. Thesis, scientific publications as appropriate. Close working with stakeholders (SNH, MSS, SSEN) to develop mitigation plans.

了解动态海底的变化速度和程度是近海建筑业的基本要求。在放置在海底的任何结构物的生命周期内，沉积物的移动可能导致掩埋或冲刷，这将需要额外的工程解决方案，以确保结构的长期完整性。大陆架既有活动状态的沉积物，也有静止状态的沉积物。陆架上许多公认的活动平台可能是遗迹，形成于上一次冰川后陆架的均衡调整过程中，不存在任何风险。相反，如果不进行昂贵的反复调查，就很难确定现代活跃沙丘的运移速度。最近从英国数据档案中心获得了可公开获取的、区域范围广泛的高分辨率海底测绘数据(如多波束声纳调查)，这为评估若干不同地理情况下的沉积物稳定性状况提供了机会。该项目将采用个案研究方法，对可能对近海建筑业构成风险的地点进行研究，并将包括活动平台(沙丘)、生物礁(冷水珊瑚)和残骸。在收集了不同时期的数据集的情况下，将计算变化率，以便估计变化的规模、速率和程度。已有试点研究，如Games&Gordon(2015)关于在两个风电场开发区观察到的沙波在五年内迁移的研究，以及对北海移动底板上建筑的影响。《爱丁堡皇家学会地球和环境科学会刊》，DOI：10.1017/S1755691015000110。然而，还没有人试图对英国大陆架上海底变化的速度和程度进行全面的大范围制图研究。该建议是由上海经济学院的彼得·沃森首先提出的，目前存在大量的电缆路线数据集，与以前的国家海底测绘运动相比，这将是非常有价值的。该项目的目标是在关键区域(活动床面、生物礁、沉船)提供测绘成果、若干海底“变化”地图。预测的变化映射了在定义的时间尺度上量化的变化速度。论文，视情况出版科学出版物。与利益相关者(SNH、MSS、SEN)密切合作，制定缓解计划。