Two-Phase SPH Simulation of Granular Landslide-Tsunamis Processes Considering Dynamic Seepage
Peng Ming
Zhao Qingxin
Li Shuang
Chu Weijiang
Zhu Yan
Ge Xiangming
Chen Fangjian
Abstract：The landslide-tsunami is a typical multi-hazard coupled system,characterized by complex effects resulting from the transmedia transformation of hazards.In this paper it proposes a two-phase Riemann-SPH model for landslide-tsunami simulation that incorporates dynamic seepage and is validated against laboratory experiments.The incorporation of dynamic seepage effects enhances the completeness of the momentum exchange mechanism in the granular landslide-tsunami process,reducing the errors in the maximum wave amplitude(am)and maximum wave height(Hm)by at least 24.72%and 41.95%,respectively.The results reveal a synergistic regulation of tsunami characteristics by the sliding surface inclination(α)and the landslide leading edge inclination(β):as α increases,the am and Hm exhibit a single-peaked,nonlinear increase-then-decrease trend.The influence of β shows a distinct piecewise pattern:when α+β<90°,both am and Hm increase significantly with the angle.Beyond this threshold,non-monotonic variations appear,reflecting a competition between the increasing landslide volume and the decreasing effective impact area.Moreover,increasing α enhances seepage,turbulent and frictional dissipation effects,accelerating energy decay.These findings provide scientific support for the mitigation of landslide-tsunami hazards.
Keywords：landslide-tsunami hazard chainRiemann-SPHdynamic seepagesliding surface inclinationlandslide leading edge inclinationfluid-soil couplingengineering geology
Publication Date：2025-10-30
Online Publishing Date：2025-11-11(First online date of this platform, not the publication date of the document)
Pages：14( 3795-3808 )