Mapping Recent Shoreline Changes Spanning the Lateral Collapse of Anak Krakatau Volcano, Indonesia
Mapping Recent Shoreline Changes Spanning the Lateral Collapse of Anak Krakatau Volcano, Indonesia
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DOI：
10.3390/app10020536
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发表时间：
2020-01-01
影响因子：
2.7
通讯作者：
Hunt, James
中科院分区：
文献类型：
--
作者：
Novellino, Alessandro;Engwell, Samantha L.;Hunt, James
我们使用卫星图像来调查2018-2019年印度尼西亚Anak Krakatau与火山活动相关的海岸线变化，跨越了一个主要的横向崩溃和通过爆炸活动再生长的时期。对海岸线的变化进行了分析和验证，方法是根据哨兵2号多光谱图像和谷歌地球引擎开发的现有方法进行调整。这项工作测试的结果，这种方法在一个高度动态的火山环境，并验证他们与手动数字化的海岸线。分析显示，尽管2018年12月22日侧向塌陷导致面积损失，但2018年5月15日至2019年11月1日期间，阿纳克喀拉喀托岛的面积从2.84公里（2）增加到3.19公里（2）。横向塌陷使岛屿面积减少到1.5公里（2），但随后在2019年的前两个月迅速增加，达到3.27公里（2）。随后是一段变化不大的时期，因为火山活动减少，然后从2019年5月到2019年11月1日净减少，这是由于该岛西南侧的侵蚀。崩溃后的喷发再生长和海岸线的变化所产生的海岸侵蚀的历史，说明了基于卫星的自动海岸线测绘的潜力，为监测偏远的岛屿火山提供数据库。
We use satellite imagery to investigate the shoreline changes associated with volcanic activity in 2018-2019 at Anak Krakatau, Indonesia, spanning a major lateral collapse and period of regrowth through explosive activity. The shoreline changes have been analyzed and validated through the adaptation of an existing methodology based on Sentinel-2 multispectral imagery and developed on Google Earth Engine. This work tests the results of this method in a highly dynamic volcanic environment and validates them with manually digitized shorelines. The analysis shows that the size of the Anak Krakatau Island increased from 2.84 km(2) to 3.19 km(2) during 15 May 2018-1 November 2019 despite the loss of area in the 22 December 2018 lateral collapse. The lateral collapse reduced the island area to similar to 1.5 km(2) but this was followed by a rapid increase in area in the first two months of 2019, reaching up to 3.27 km(2). This was followed by a period of little change as volcanic activity declined and then by a net decrease from May 2019 to 1 November 2019 that resulted from erosion on the SW side of the island. This history of post-collapse eruptive regrowth and coastal erosion derived from the shoreline changes illuminates the potential for satellite-based automated shoreline mapping to provide databases for monitoring remote island volcanoes.