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The effect of local irregular topography on seismic ground motion

Acta Seismologica Sinica(English Edition) 1996年第2期9卷 309-315页

作者：刘晶波 1. Department of Civil Engineering Tsinghua University 100084 Beijing China

Effects of irregular topography on ground motion for incident P, SV and the propagation of Rayleigh waves are studied by combining finite element method with modified transmitting boundary. TheoretiCal models include isolated protrUding topography and similar adjacent Protruding topography. The concluaion drawn from thisstudy is that the effects Of isolated protruding topography are remarkably larger for Rayleigh wave propagation than for P and SV they waves; Considering adjacent irregular toography ground motion is amplified, the duration of ground motion becomes longer and the speCtral ratios exhibit narrowband peaks Considering adjacent irregular topography and Rayleigh wave Propagation, the theoretical results wb more approach the results obtained in practice.

关键词： ground motion irregular topography seismic wave

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An optimized finite difference method based on a polar coordinate system for regional-scale irregular topography

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Earthquake Science 2021年第4期34卷 334-343页

作者： Jianxia Xu Wei Zhang Xiaofei Chen School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China

The finite difference method(FDM)is an important numerical approach for simulating the propagation of seismic waves,and some FDMs can be used to study the impact of the Earth’s curvature and topography over large *** efficiently model the effects of the Earth’s irregular topography on the propagation of seismic waves,here we optimize a previously proposed grid mesh method and develop a novel two-dimensional boundary-conforming FDM based on a curvilinear polar coordinate *** method efficiently simulates the propagation of seismic waves in an arc-shaped model with large variations in surface *** method was benchmarked against other reported methods using several global-scale *** consistency of the results confirms the validity of our proposed optimization ***,our findings indicate that the proposed optimization strategy improves computational efficiency.

关键词： finite difference irregular topography polar coordinate system.

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Well-balanced numerical modelling of non-uniform sediment transport in alluvial rivers

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International Journal of Sediment Research 2015年第2期30卷 117-130页

作者： Honglu Qian Zhixian Cao Gareth Pender Huaihan Liu Peng Hu State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Institute for Infrastructure and Environment Heriot-Watt University Yangtze River Waterway Bureau School of Ocean Science and Engineering Zhejiang University

The last two decades have witnessed the development and application of well-balanced numerical models for shallow flows in natural ***,until now there have been no such models for flows with non-uniform sediment *** paper presents a 1D well-balanced model to simulate flows and non-capacity transport of non-uniform sediment in alluvial *** active layer formulation is adopted to resolve the change of bed sediment *** the framework of the finite volume Slope Llmiter Centred(SLIC) scheme,a surface gradient method is incorporated to attain well-balanced solutions to the governing *** proposed model is tested against typical cases with irregular topography,including the refilling of dredged trenches,aggradation due to sediment overloading and flood flow due to landslide dam *** agreement between the computed results and measured data is *** to a non-well-balanced model,the well-balanced model features improved performance in reproducing stage,velocity and bed *** should find general applications for non-uniform sediment transport modelling in alluvial rivers,especially in mountain areas where the bed topography is mostly irregular.

关键词： Non-uniform:sediment transport Well-balanced scheme irregular topography Shallow flow Mathematical river modelling

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