Benchmarking Non-Hydrostatic Tsunami-HySEA and Multilayer-HySEA Codes for Tsunami Hazard Assessment

This study focuses on the adaptation and enhancement of the Non-hydrostatic Multilayer version of the Tsunami-HySEA code to better model tsunamis triggered by granular flows. The aim is to optimize the code for operational hazard assessment, particularly for the Stromboli Island, and to meet the integration requirements for early warning systems for events occurring along the Sciara del Fuoco scarp.

 

Significant improvements have been achieved, including a 50% reduction in computational time compared to the previous version. A prototype simulation has been developed to model tsunami propagation in the Tyrrhenian Sea, initiated by a landslide at Sciara del Fuoco on Stromboli Island. This simulation employs a coupled approach: first, it models the initial minutes of the event near Stromboli using the Multilayer-HySEA code in UTM coordinates. Then, the resulting data are transferred as input to other Tsunami-HySEA codes (hydrostatic or non-hydrostatic) operating in lat-lon coordinates. This two-step process enables efficient and accurate modeling of tsunami wave propagation across the entire Tyrrhenian Sea.

 

Acknowledgments: This contribution was supported by the Center of Excellence for exascale in Solid Earth (ChEESE-2P) funded by the European High Performance Computing Joint Undertaking (JU) under grant agreement No 101093038 and  by the grants PID2022-137637NB-C21 and PID2022-137637NB-C22 funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”.