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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Mapping and DOWNFLOW simulation of recent lava flow fields at Mount Etna
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Mapping and DOWNFLOW simulation of recent lava flow fields at Mount Etna

机译：埃特纳火山最近熔岩流场的制图和下行模拟

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In recent years, progress in geographic information systems (GIS) and remote sensing techniques have allowed the mapping and studying of lava flows in unprecedented detail. A composite GIS technique is introduced to obtain high resolution boundaries of lava flow fields. This technique is mainly based on the processing of LIDAR-derived maps and digital elevation models (DEMs). The probabilistic code DOWNFLOW is then used to simulate eight large flow fields formed at Mount Etna in the last 25 years. Thanks to the collection of 6 DEMs representing Mount Etna at different times from 1986 to 2007, simulated outputs are obtained by running the DOWNFLOW code over pre-emplacement topographies. Simulation outputs are compared with the boundaries of the actual flow fields obtained here or derived from the existing literature. Although the selected fields formed in accordance with different emplacement mechanisms, flowed on different zones of the volcano over different topographies and were fed by different lava supplies of different durations, DOWNFLOW yields results close to the actual flow fields in all the cases considered. This outcome is noteworthy because DOWNFLOW has been applied by adopting a default calibration, without any specific tuning for the new cases considered here. This extensive testing proves that, if the pre-emplacement topography is available, DOWNFLOW yields a realistic simulation of a future lava flow based solely on a knowledge of the vent position. In comparison with deterministic codes, which require accurate knowledge of a large number of input parameters, DOWNFLOW turns out to be simple, fast and undemanding, proving to be ideal for systematic hazard and risk analyses.
机译：近年来，随着地理信息系统（GIS）和遥感技术的进步，熔岩流的映射和研究得到了空前的详细研究。引入了一种复合GIS技术来获得熔岩流场的高分辨率边界。该技术主要基于激光雷达衍生的地图和数字高程模型（DEM）的处理。然后使用概率代码DOWNFLOW模拟过去25年在埃特纳火山形成的八个大流场。由于收集了1986年至2007年不同时间代表埃特纳火山的6个DEM，通过在落位前的地形上运行DOWNFLOW代码可获得模拟输出。将模拟输出与此处获得或从现有文献中得出的实际流场的边界进行比较。尽管所选择的场是根据不同的沉积机制形成的，流经火山的不同区域的不同地形，并由不同持续时间的不同熔岩供给，但在所有考虑的情况下，降流产量都接近实际流场。此结果值得注意，因为通过采用默认校准已应用了DOWNFLOW，而对此处考虑的新情况未进行任何特定的调整。这项广泛的测试证明，如果可以使用放置前的地形，则DOWNFLOW仅基于排气孔位置的知识即可对未来的熔岩流进行逼真的模拟。与确定性代码相比，确定性代码需要准确了解大量输入参数，事实证明，DOWNFLOW简单，快速且不需要，被证明是进行系统危害和风险分析的理想选择。

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