评估当前大陆尺度的海岸沉降:利用欧洲地动服务从欧洲获得的启示

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2024-08-13 DOI:10.1029/2024EF004523
Rémi Thiéblemont, Gonéri Le Cozannet, Robert J. Nicholls, Jérémy Rohmer, Guy Wöppelmann, Daniel Raucoules, Marcello de Michele, Alexandra Toimil, Daniel Lincke
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引用次数: 0

摘要

除了气候变化引起的海平面上升(SLR)之外,陆地沉降也会大大增加洪水易发地区的沿海风险。由于缺乏覆盖这些大尺度区域的网格化观测产品,绘制和量化大陆尺度的当代陆地垂直运动(VLM)一直是一个挑战。在这里,我们利用新的欧洲地动服务(EGMS)来评估欧洲沿岸垂直地动的现状,从而填补了这一空白。首先,我们比较了基于 InSAR 的 EGMS 正射影像(3 级)和附近的全球导航卫星系统(GNSS)的垂直速度估算值,结果表明,用于校准 EGMS 的大地测量参考框架对每年毫米级的沿岸陆地垂直速度估算值影响很大,需要慎重考虑。根据更新、更准确的国际大地参照系(ITRF2014)调整 EGMS 的垂直速度估算值后,我们对欧洲低海拔沿岸冲积平原(CFPs)的垂直陆地速度进行了评估。我们发现,欧洲近一半的沿岸洪泛平原地区平均下沉速度超过 1 毫米/年。更重要的是,我们发现位于 CFP 的城市地区和人口平均经历了接近-1 毫米/年的 VLM(不包括隆起的芬诺斯坎迪亚地区)。就港口而言,平均 VLM 更大,平均增至-1.5 毫米/年。这表明,基于 InSAR 和全球导航卫星系统的大陆尺度评估具有广泛的重要性,可以更好地确定因海岸下沉而受到相对可持续土地退化影响的风险较高的地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Assessing Current Coastal Subsidence at Continental Scale: Insights From Europe Using the European Ground Motion Service

Assessing Current Coastal Subsidence at Continental Scale: Insights From Europe Using the European Ground Motion Service

Beside climate-change-induced sea-level rise (SLR), land subsidence can strongly amplify coastal risk in flood-prone areas. Mapping and quantifying contemporary vertical land motion (VLM) at continental scales has long been a challenge due to the absence of gridded observational products covering these large domains. Here, we fill this gap by using the new European Ground Motion Service (EGMS) to assess the current state of coastal VLM in Europe. First, we compare the InSAR-based EGMS Ortho (Level 3) with nearby global navigation satellite systems (GNSS) vertical velocity estimates and show that the geodetic reference frame used to calibrate EGMS strongly influences coastal vertical land velocity estimates at the millimeter per year level and this needs to be considered with caution. After adjusting the EGMS vertical velocity estimates to a more updated and accurate International Terrestrial Reference Frame (ITRF2014), we performed an assessment of VLM in European low elevation coastal flood plains (CFPs). We find that nearly half of the European CFP area is, on average, subsiding at a rate faster than 1 mm/yr. More importantly, we find that urban areas and populations located in the CFP experience a near −1 mm/yr VLM on average (excluding the uplifting Fennoscandia region). For harbors, the average VLM is even larger and increases to −1.5 mm/yr on average. This demonstrates the widespread importance of continental-scale assessments based on InSAR and GNSS to better identify areas at higher risk from relative SLR due to coastal subsidence.

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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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