25 years of satellite InSAR monitoring of ground instability and coastal geohazards in the archaeological site of Capo Colonna, Italy
25 years of satellite InSAR monitoring of ground instability and coastal geohazards in the archaeological site of Capo Colonna, Italy
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DOI：
10.1117/12.2242095
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
F. Cigna;P. Confuorto;A. Novellino;D. Tapete;D. Martire;M. Ramondini;D. Calcaterra;S. Plank;F. Ietto;A. Brigante;A. Sowter
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文献类型：
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作者：
F. Cigna;P. Confuorto;A. Novellino;D. Tapete;D. Martire;M. Ramondini;D. Calcaterra;S. Plank;F. Ietto;A. Brigante;A. Sowter
几个世纪以来，意大利南部卡拉布里亚地区的卡波科隆纳海角经历了地面沉降和海岸线退缩，以至于古希腊避难所的考古遗址目前正面临悬崖崩塌、倾覆和不可逆转的损失的威胁。在区域范围内，附近井的天然气开采是另一个需要考虑的人为因素。利用前所未有的卫星合成孔径雷达（SAR）时间序列，包括1992年至2016年间获得的ERS-1/2、ENVISAT、TerraSAR-X、cosmos - skymed和Sentinel-1A数据集，本文首次也是最完整的干涉SAR （InSAR）基线评估了影响卡波科隆纳的陆地沉降和海岸过程。我们分析了区域位移趋势、垂直位移与天然气采出量之间的相关性、对考古遗产稳定性的影响以及沿海地质灾害的易感性。在过去的25年里，土地不断下沉，2011-2014年最高的年视线变形率在-15到-20毫米/年之间。沿着北部海岸线和考古公园内安装了40对角反射器，提高了成像能力和测量点的密度。事实证明，这对最近考古发掘的地面稳定性评估是有益的，在2015年11月的实地调查中，该地区突出了新的悬崖破坏事件。所开发的概念模型表明，结合InSAR结果、地貌评估和波浪风暴的清单将有助于揭示卡波科隆纳海岸地质灾害的复杂性。
For centuries the promontory of Capo Colonna in Calabria region, southern Italy, experienced land subsidence and coastline retreat to an extent that the archaeological ruins of the ancient Greek sanctuary are currently under threat of cliff failure, toppling and irreversible loss. Gas extraction in nearby wells is a further anthropogenic element to account for at the regional scale. Exploiting an unprecedented satellite Synthetic Aperture Radar (SAR) time series including ERS-1/2, ENVISAT, TerraSAR-X, COSMO-SkyMed and Sentinel-1A data stacks acquired between 1992 and 2016, this paper presents the first and most complete Interferometric SAR (InSAR) baseline assessment of land subsidence and coastal processes affecting Capo Colonna. We analyse the regional displacement trends, the correlation between vertical displacements with gas extraction volumes, the impact on stability of the archaeological heritage, and the coastal geohazard susceptibility. In the last 25 years, the land has subsided uninterruptedly, with highest annual line-of-sight deformation rates ranging between -15 and -20 mm/year in 2011-2014. The installation of 40 pairs of corner reflectors along the northern coastline and within the archaeological park resulted in an improved imaging capability and higher density of measurement points. This proved to be beneficial for the ground stability assessment of recent archaeological excavations, in an area where field surveying in November 2015 highlighted new events of cliff failure. The conceptual model developed suggests that combining InSAR results, geomorphological assessments and inventorying of wave-storms will contribute to unveil the complexity of coastal geohazards in Capo Colonna.