The Creation of a Map of Current Vertical Land Movements in the UK based on an Optimal Combination of Absolute Gravity and Continuous GPS

基于绝对重力和连续 GPS 的最佳组合创建英国当前垂直陆地运动地图

• 批准号: NE/F012179/1
• 负责人: Richard Bingley
• 金额: $ 7.24万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FF012179%2F1
• 关键词: Creation; Map; Current; Vertical; Land

The proposed research aims to create a map of current vertical land movements in the UK based on an optimal combination of estimates from two geodetic surveying and monitoring techniques; the measurement of absolute gravity (AG) and the use of high precision, continuous GPS (CGPS) observations. From long term geological and geophysical studies, vertical land movements in the UK are thought to be of the order of 1 to 2 millimetres per year, with Scotland rising and the South of England subsiding, so that Great Britain is effectively 'tilting'. IESSG and NERC-POL have been working collaboratively on research related to the use of AG and CGPS for monitoring vertical land movements of this order since 1997. This past research has primarily focused on the use of AG and CGPS at tide gauges, with the aim of measuring current changes in sea level (decoupled from changes in land level) around the coast of Great Britain. For the proposed research, we will be extending our analysis from our traditional focus on tide gauges around the coast of Great Britain to consider all available CGPS stations in the UK. There are 140 such CGPS stations, which provide a density of network with station separations of about 50km, located in various geological settings throughout the UK. We will also be refining our analysis to produce new and improved estimates of vertical land movements, using the latest information, ideas and softwares available for geodetic surveying and monitoring. The proposed research is a small discrete project and will be the first attempt to create a map of current vertical land movements in the UK based on an optimal combination of AG and so many CGPS stations. With such a map it will be possible to then use model predictions of future changes in sea level in order to better assess future changes in sea level with respect to the land for all coastal regions of the UK. The proposed research could also be considered as a proof-of-concept study, as some of the 140 stations will not be suitable, due to their relatively short time series, but future refinement of the map will clearly be possible as more stations are installed and/or time series are extended in the future.

拟议的研究旨在创建一个地图的基础上，从两个大地测量和监测技术的最佳组合的估计，目前在英国的垂直土地运动;绝对重力（AG）的测量和使用高精度，连续的GPS（CGPS）观测。根据长期的地质和地球物理研究，英国的垂直陆地运动被认为是每年1到2毫米，苏格兰上升，英格兰南部下沉，所以英国实际上是“倾斜”的。自1997年以来，IESSG和NERC-POL一直在合作研究使用AG和CGPS监测这一量级的垂直陆地移动。过去的研究主要集中在使用AG和CGPS验潮仪，目的是测量英国海岸周围海平面的当前变化（与陆地水平变化脱钩）。对于拟议的研究，我们将扩展我们的分析，从我们的传统重点潮汐计周围的英国海岸，考虑所有可用的CGPS站在英国。有140个这样的CGPS站，提供了站间距约50公里的网络密度，位于英国各地的不同地质环境中。我们还将改进我们的分析，利用大地测量和监测方面的最新信息、想法和软件，对垂直土地移动作出新的和更好的估计。拟议中的研究是一个小型的离散项目，将是第一次尝试创建一个地图的基础上，在英国的AG和这么多的CGPS站的最佳组合，目前的垂直土地运动。有了这样一张地图，就有可能使用海平面未来变化的模型预测，以便更好地评估英国所有沿海地区未来海平面相对于陆地的变化。拟议的研究也可被视为一项概念验证研究，因为140个台站中的一些台站由于其时间序列相对较短而不适用，但随着今后更多台站的安装和/或时间序列的延长，今后显然有可能对地图进行完善。