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Seismic hazard prediction using multispectral amplification maps in a complex topographic area: A case study of Qiaozhuang town, Sichuan Province, Southwest China

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Journal of Mountain Science 2022年第3期19卷 726-739页

作者： LUO Yong-hong XU Qiang ZHAN Wei-wei GRELLE Gerardo State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection Chengdu University of TechnologyChengdu 610059China Department of Civil and Environmental Engineering Tufts UniversityMedfordMA 02155USA Department of Civil and Environment Engineering University of RomeRome 00184Italy

Earthquakes can cause widely distributed slope failures and damage in mountainous *** accurate prediction of ground motions in mountainous areas is essential for managing the seismic risk of urban cities near mountains but is restricted primarily by complex seismic site amplification effects in areas of uneven *** study selected Qiaozhuang town located in the Qingchuan–Pingwu fault zone,Southwest China,as a case study.A simulator for mapped seismic responses using a hybrid model(Si Se RHMap)was applied to compute the multispectral seismic topographic amplification maps at the three slope units surrounding Qiaozhuang town(Weigan hill,***,and ***).Post-earthquake damage survey maps,1 D seismic site response spectral ratios,and H/V spectral ratios of earthquake data were used to validate the computed seismic site amplification factors and resonance *** results suggest that strong topographic amplification effects usually occur at distinct slope locations,such as hilltops,convex slope positions,upslope,and narrow *** computed topographic amplification factors in the study area reached up to 2.4 at upslope or hilltops,and the resonance frequencies were between 3 and 10 *** effects can be as important as stratigraphic effects when assessing seismic amplification effects in the study *** conclude that both topographic and stratigraphic effects should be considered in the comprehensive seismic hazard assessment of the study area or other similar mountain towns.

关键词： Seismic hazard prediction Multispectral amplification map topographic effects Stratigraphic effects SiSeRHMap Wenchuan earthquake

Local topography-induced pressure gradient effects on the wake and power output of a model wind turbine

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Theoretical & Applied Mechanics Letters 2021年第5期11卷 304-311页

作者： Tengfei Cai Shyuan Cheng Antonio Segalini Leonardo P.Chamorro School of Mechanical Engineering University of Science and Technology BeijingBeijing100083 China Department of Mechanical Science and Engineering University of IllinoisUrbanaIL 61801USA Department of Earth Sciences Uppsala UniversityUppsalaSweden Department of Aerospace Engineering University of IllinoisUrbanaIL 61801USA Department of Civil and Environmental Engineering University of IllinoisUrbanaIL 61801USA Department of Geology University of IllinoisUrbanaIL 61801USA

Wind-tunnel experiments were performed to study the effect of favorable and adverse constant pressure gradients(PG)from local changes in the topography right downwind of a model wind *** image velocimetry was used to characterize the near and intermediate wake *** explored five scenarios,two favorable,two adverse PG,and a case with negligible *** show that the PGs induce a wake deflection and modulate the *** imposed a relatively small impact on the turbulence kinetic energy and kinematic shear stress but a comparatively dominant effect on the bulk flow on the flow *** on this,a simple formulation is used to describe the impact of PG on the *** modeled the base flow through a linearized perturbation method;the wake is obtained by solving a simplified,integrated streamwise momentum *** approach reasonably estimated the flow profile and PG-induced power output variations.

关键词： topographic effects Pressure gradient Turbine wake Power output

Preliminary results of strong ground motion simulation for the Lushan earthquake of 20 April 2013,China

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Earthquake Science 2013年第3期26卷 191-197页

作者： Gengshang Zhu Zhenguo Zhang Jian Wen Wei Zhang Xiaofei Chen School of Earth and Space Sciences University of Science and Technology of China Laboratory of Seismology and Physics of Earth’s Interior University of Science and Technology of China

The earthquake occurred in Lushan County on 20 April, 2013 caused heavy casualty and economic loss. In order to understand how the seismic energy propagates during this earthquake and how it causes the seismic haz- ard, we simulated the strong ground motions from a rep- resentative kinematic source model by Zhang et al. （Chin J Geophys 56（4）：1408-1411, 2013） for this earthquake. To include the topographic effects, we used the curved grids finite difference method by Zhang and Chen （Geophys J Int 167（1）：337-353, 2006）, Zhang et al. （Geophys J Int 190（1）：358-378, 2012） to implement the simulations. Our results indicated that the majority of seismic energy con- centrated in the epicentral area and the vicinal Sichuan Basin, causing the XI and VII degree intensity. Due to the strong topographic effects of the mountain, the seismic intensity in the border area across the northeastern of Boxing County to the Lushan County also reached IX degree. Moreover, the strong influence of topography caused the amplifications of ground shaking at the moun- tain ridge, which is easy to cause landslides. These results are quite similar to those observed in the Wenchuan earthquake of 2008 occurred also in a strong topographic mountain area.

关键词： Lushan earthquake Strong groundmotion topographic effects Seismic intensity