Multi-level emulation of tsunami simulations over Cilacap, South Java, Indonesia

Multi-level emulation of tsunami simulations over Cilacap, South Java, Indonesia
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印度尼西亚南爪哇芝拉扎海啸模拟的多级模拟

DOI:
10.1007/s10596-022-10183-1
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发表时间:
2022
影响因子:
2.5
通讯作者:
Ehara A
Ehara A
中科院分区:
地球科学3区
文献类型:
--
作者:
Ehara A

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进行概率海啸灾害评估 (PTHA) 需要以高分辨率进行大量模拟。统计仿真构建了一个替代模拟器来取代模拟器,从而降低了将不确定性从地震源传播到海啸淹没时的计算成本。为了进一步降低这些成本,我们在此建议构建利用多个分辨率级别和计算机实验的顺序设计的模拟器。通过在高分辨率下运行一些海啸模拟和在较低分辨率下运行更多模拟,我们能够提供切合实际的评估,而对于相同的预算,仅使用高分辨率海啸模拟并不能提供令人满意的结果。因此,可以使用最高空间分辨率以更高精度考虑 PTHA,并考虑对更大区域的影响。我们以印度尼西亚芝拉扎市为例,展示了我们方法的好处。
Carrying out a Probabilistic Tsunami Hazard Assessment (PTHA) requires a large number of simulations done at a high resolution. Statistical emulation builds a surrogate to replace the simulator and thus reduces computational costs when propagating uncertainties from the earthquake sources to the tsunami inundations. To reduce further these costs, we propose here to build emulators that exploit multiple levels of resolution and a sequential design of computer experiments. By running a few tsunami simulations at high resolution and many more simulations at lower resolutions we are able to provide realistic assessments whereas, for the same budget, using only the high resolution tsunami simulations do not provide a satisfactory outcome. As a result, PTHA can be considered with higher precision using the highest spatial resolutions, and for impacts over larger regions. We provide an illustration to the city of Cilacap in Indonesia that demonstrates the benefit of our approach.
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