The emplacement of the active lava flow at Sinabung Volcano, Sumatra, Indonesia, documented by structure-from-motion photogrammetry
The emplacement of the active lava flow at Sinabung Volcano, Sumatra, Indonesia, documented by structure-from-motion photogrammetry
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DOI：
10.1016/j.jvolgeores.2018.02.004
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发表时间：
2019-09-15
影响因子：
2.9
通讯作者：
Dhanu, Bima Eko
中科院分区：
文献类型：
--
作者：
Carr, Brett B.;Clarke, Amanda B.;Dhanu, Bima Eko
印度尼西亚锡纳朋火山于2013年12月开始喷发。我们使用运动结构(SfM)摄影测量技术来创建活动熔岩流的数字高程模型(DEM)。我们从两个不同时期拍摄的照片和两个独立的低成本手持相机建立DEM，并将它们与喷发前DEM进行比较，以评估使用不同相机创建的摄影测量DEM的质量和准确性，计算流量和长期平均渗漏率，并记录水流形态的变化。2014年9月22日，熔岩流长2.9公里，体积为1.03+/-0.14×10(8)m(3)，估计时平均流量为4.8+/-0.6m(3)S(-1)。与摄影测量DEM的比较表明，在为期两周的野外活动中，流动的地形变化发生在沿流动锋面和上翼面的区域，这一发现得到了相应热图像中相对较高的温度的支持。这种变形可以用流动前沿的主动推进和上翼失稳和坍塌的发展来解释。2014年10月和2015年6月，与上翼不稳定性的重力坍塌相关的大型火山碎屑密度流是由山脊上生长的熔岩引起的，这些山脊最初将流动限制在预先存在的河道内。这项工作展示了SfM摄影测量测量或识别熔岩流量、时间平均流量、流量侵位速率和类型以及重力不稳定性的发展的能力。我们的结果表明，SfM摄影测量作为一种具有成本和时间效益的方法，在锡纳朋和类似的喷发期间重复测量活跃的火山特征和监测灾害具有潜力。(C)2018年爱思唯尔B.V.
An effusive eruption at Sinabung Volcano in Indonesia began in December 2013. We use structure-from-motion (SfM) photogrammetric techniques to create digital elevation models (DEMs) of the active lava flow. We build DEMs from photographs taken during two separate time periods and from two separate low-cost handheld cameras and compare them with a pre-eruption DEM to assess the quality and accuracy of photogrammetric DEMs created using different cameras, calculate flow volume and long-term average effusion rate, and document changes in flow morphology. On September 22nd, 2014, the lava flow was 2.9 km long and had a volume of 1.03 +/- 0.14 x 10(8) m(3), leading to an estimated time-averaged discharge rate of 4.8 +/- 0.6 m(3) s(-1). Differencing the photogrammetric DEMs shows that during the two-week field campaign, topographic changes of the flow occurred in zones along the flow front and on the upper flank, a finding supported by relatively high temperatures in corresponding thermal images. The deformation can be explained by active advance at the flow front and development of instabilities and collapse on the upper flanks. large pyroclastic density currents associated with gravitational collapse of upper-flank instabilities in October 2014 and June 2015 were caused by lava growing over ridges that had initially confined the flow to a pre-existing channel. This work demonstrates the ability of SfM photogrammetry to measure or identify the lava flow volume, time-averaged discharge rate, flow emplacement rate and style, as well as the development of gravitational instabilities. Our results show the potential of SfM photogrammetry as a cost- and time-effective method of repeatedly measuring active volcanic features and monitoring hazards at Sinabung and during similar eruptions. (C) 2018 Elsevier B.V.