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DOWNSLOPE EROSION PROCESS UNDER UPSLOPE RUNOFF AND SEDIMENT USING A DUAL-BOX SYSTEM

International Journal of Sediment Research 2005年第2期20卷 136-142页

作者： Peiqing XIAO1,Fenli ZHENG2 and Wenyi YAO31Doctor candidate,State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling Shaanxi,china,712100 Graduate school of Chinese Academy of Sciences,Beijing 100049,china Engineer,Institute of Hydraulic Research,Yellow River Conservancy Commission,Zhengzhou 450003,china,2professor,State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciencesand Ministry of Water Resources,Yangling Shaanxi 712100,china 3Chief Engineer,Institute of Hydraulic Research,Yellow River Conservancy Commission,Zhengzhou 450003,china Engineer Institute of Hydraulic Research Yellow River Conservancy Commission Zhengzhou 450003 China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Yangling Shaanxi 712100 China Institute of Hydraulic Research Yellow River Conservancy Commission Zhengzhou 450003 China

Soil erosion at the hilly-gully region of the Loess Plateau has obvious vertical erosion zonation from watershed boundary to gully edge. Meanwhile,upslope runoff and sediment have a significant impact on the downslope erosion process. But due to the limits of research methods,there is not much data available to quantify the effects of upslope runoff and sediment on the downslope erosion process under different conditions. The objective of this study was to quantify the effects of upslope runoff and sediment on the downslope erosion process using a dual-box system with a 15° gradient consisting of a 2 m-long feeder box and a 5 m-long test box under different runoff rates andsediment concentrations in upslope runoff,rainfall intensities and soil surface conditions. The results showed that the sediment regime was detachment-transport dominant at steep hillslopes. The net sediment delivery S caused by upslope runoff was controlled by sediment concentration in upslope runoff,especially by interaction of the rainfall intensity,runoff rate,surface condition and dominant erosion process. The net sediment delivery S accounted for the total sediment deliverySft atdownslope 31.7% to 97.3% and 27.8 to 89.7% for both loose and compact surface treatments,respectively. Rainfall intensity,slope gradient,surface condition,and rill erosion development hadimportant influences on the downslope erosion process.

关键词： Run-on water and sediment Erosion process A dual-box system Net sediment delivery

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Preliminary analysis of the hanging wall effect and velocity pulse of the 5.12 Wenchuan earthquake

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Earthquake Engineering and Engineering Vibration 2009年第2期8卷 165-177页

作者： Liu Qifang and Li Xiaojun Institute of Engineering Mechanics, china Earthquake Administration, Harbin 150080, china Associate professor professor Associate professor Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China. professor Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

A preliminary study of the PGA attenuation, hanging wall effect and velocity pulse characteristics from the 2008 Wenchuan earthquake ofMS -8.0 is described in this paper. The study was carried out through analyses in the time and frequency domains of main earthquake records. In the PGA attenuation study, records from 316 stations less than 1000 km from the surface rupture of the fault were used as a database and attenuation relationships were developed and compared with some existing relationships that are widely used in china's Mainland, Chinese Taiwan and the US. At the same time, records from 28 stations less than 100 km from the fault were used to study the hanging wall effect and velocity pulse characteristics of this earthquake based on the distribution of PGA, PGV, spectral acceleration, and the velocity pulse peak, and the results are compared with the 1999 Chi-Chi earthquake. In addition, the large PGAs of the UD components observed in this event are also discussed in this paper. From the results of the preliminary study, some conclusions are developed and suggestions for further research are proposed.

关键词： Wenchuan earthquake hanging wall effect velocity pulse attenuation

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On time-step in structural seismic response analysis under ground displacement/acceleration

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Earthquake Engineering and Engineering Vibration 2009年第3期8卷 341-347页

作者： TianYuji~+ and Yang Qingshan~(++) School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,china +Associate professor ++professor School of Civil Engineering Beijing Jiaotong University Beijing 100044 China

There are two models in use today to analyze structural responses when subjected to earthquake ground motions, the Displacement Input Model （DIM） and the Acceleration Input Model （AIM）. The time steps used in direct integration methods for these models are analyzed to examine the suitability of DIM. Numerical results are presented and show that the time-step for DIM is about the same as for AIM, and achieves the same accuracy. This is contrary to previous research that reported that there are several sources of numerical errors associated with the direct application of earthquake displacement loading, and a very small time step is required to define the displacement record and to integrate the dynamic equilibrium equation. It is shown in this paper that DIM is as accurate and suitable as, if not more than, AIM for analyzing the response of a structure to uniformly distributed and spatially varying ground motions.

关键词： integration time step multi-supported structure displacement input model acceleration input model spatially varying ground motions

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professor Hong-Yuan Yang (1933-2010)

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Journal of Integrative Plant Biology 2011年第1期53卷 89-91页

作者： Mengxiang Sun professor at Wuhan University,Wuhan,china Chun-Ming Liu professor at Institute of Botany,Chinese Academy of Sciences,china professor at Wuhan University Wuhan China professor at Institute of Botany Chinese Academy of Sciences China

Prof. Hong-Yuan Yang, a renowned botanist, Academician of the Chinese Academy of Sciences and professor of Wuhan University, passed away at the age of 77 in Wuhan on November 18. 2010.

关键词： In professor Hong-Yuan Yang 2010 Cell

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Building damage in Dujiangyan during Wenchuan Earthquake

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Earthquake Engineering and Engineering Vibration 2008年第3期7卷 263-269页

作者： Zhang Minzheng and Jin Yingjie Institute of Engineering Mechanics, china Earthquake Administration, Harbin 150080, china professor Graduate Student Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

A field damage survey of 1,005 buildings damaged by the Wenchuan Earthquake in Dujiangyan City was carried out and the resulting data was analyzed using the statistical method. It is shown that buildings that were seismically designed achieved the desired seismic fortification target; they sustained less damage than the non-seismically designed buildings. Among the seismically designed buildings investigated, RC frame buildings performed the best in terms of seismic resistance. Masonry buildings with a ground story of RC frame structure were the second best, and masonry buildings performed the worst. Considering building height, multistory buildings sustained more severe damage than high-rise buildings and 2- and 3-story buildings. Compared to residential buildings, public buildings, such as schools and hospitals, suffered more severe damage.

关键词： Wenchuan Earthquake Dujiangyan building damage seismic intensity field survey

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Structural condition assessment of long-span suspension bridges using long-term monitoring data

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 123-131页

作者： Deng Yang~+,Ding Youliang~(++) and Li Aiqun~§Key Laboratory of Concrete & Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,china PhD Student ++ Assistant professor ~§professor Key Laboratory of Concrete & Prestressed Concrete Structures of Ministry of Education Southeast University Nanjing 210096 China

This paper focuses on developing an online structural condition assessment technique using long-term monitoring data measured by a structural health monitoring system. The seasonal correlations of frequency-temperature and beam-end displacement-temperature for the Runyang Suspension Bridge are performed, first. Then, a statistical modeling technique using a six-order polynomial is further applied to formulate the correlations of frequency-temperature and displacement-temperature, from which abnormal changes of measured frequencies and displacements are detected using the mean value control chart. Analysis results show that modal frequencies of higher vibration modes and displacements have remarkable seasonal correlations with the environmental temperature and the proposed method exhibits a good capability for detecting the micro damage-induced changes of modal frequencies and displacements. The results demonstrate that the proposed method can effectively eliminate temperature complications from frequency and displacement time series and is well suited for online condition monitoring of long-span suspension bridges.

关键词： structural health monitoring modal frequency beam-end displacement temperature seasonal correlation suspension bridge

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Shear wave velocity-based liquefaction evaluation in the great Wenchuan earthquake: a preliminary case study

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Earthquake Engineering and Engineering Vibration 2009年第2期8卷 231-239页

作者： Zhou Yanguo,Chen Yunmin and Ling Daosheng MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,china Assistant professor professor Assistant professor MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Institute of Geotechnical Engineering Zhejiang University Hangzhou 310058 China. professor MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Institute of Geotechnical Engineering Zhejiang University Hangzhou 310058 China

The great Wenchuan earthquake （Ms= 8.0） in 2008 caused severe damage in the western part of the Chengdu Plain. Soil liquefaction was one of the major causes of damage in the plain areas, and proper evaluation of liquefaction potential is important in the definition of the seismic hazard facing a given region and post-earthquake reconstruction. In this paper, a simplified procedure is proposed for liquefaction assessment of sandy deposits using shear wave velocity （V）, and soil liquefaction from the Banqiao School site was preliminarily investigated after the earthquake. Boreholes were made at the site and shear wave velocities were measured both by SASW and down-hole methods. Based on the in-situ soil information and V profiles, the liquefaction potential of this site was evaluated. The results are reasonably consistent with the actual field behavior observed after the earthquake, indicating that the proposed procedure is effective. The possible effects of gravel and fines contents on liquefaction of sandy soils were also briefly discussed.

关键词： liquefaction Wenchuan earthquake shear wave velocity spectral analysis of surface waves (SASW) hazarddefinition

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EXTRACTION KINETICS,SYNERGISTIC EFFECTS AND INTERFACIAL CHEMISTRY FOR D_2 EHPA MPA-Fe^(3+) MIXED EXTRACTION SYSTEM

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Acta Metallurgica Sinica(English Letters) 1993年第12期6卷 405-410页

作者： YU Jingfen LIU Difei Tsinghua University,Beijing,china professor,Dept.of Chemical Engineering,Tsinghua University,Beijing 100084,china Tsinghua Univ Beijing China

The thermodynamics of micella formation,interfacial characteristics,synergistic effects and interfacial kinetics for synergistic extraction system D_2 EHPA-MPA-Fe^(3+) have been *** was found that D_2EHPA in the mixed system strongly exhibits the effect on the micella formation thermodynamics and interracial characteristics of *** ther- modynamic parameters for constants of micelles formation(K_m).free energies of micelles formation(ΔG_m)and critical micella concentrations(CMC)were *** inter- facial adsorption behaviour of D_2EHPA is opposite to that of *** emulsification for single MPA and the mixed system was *** synergistic effects were found in this mixed extraction *** is proved that the process of the Fe^(3+) extraction for non-mixed extraction system is controlled by chemical reaction and the controlling reaction occurs at the interface.

关键词： interfacial chemistry synergistic effect Fe^(3+) extraction kinetics

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Emergency assessment of seismic landslide susceptibility: a case study of the 2008 Wenchuan earthquake affected area

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Earthquake Engineering and Engineering Vibration 2009年第2期8卷 207-217页

作者： Tang Chuan,Zhu Jing and Liang Jingtao State Key Laboratory of Geo-Hazard Prevention,Chengdu University of Technology,Chengdu 610059,china professor Associate professor Graduate Student professor State Key Laboratory of Geo-Hazard Prevention Chengdu University of Technology Chengdu 610059 China. Associate professor State Key Laboratory of Geo-Hazard Prevention Chengdu University of Technology Chengdu 610059 China. State Key Laboratory of Geo-Hazard Prevention Chengdu University of Technology Chengdu 610059 China

The 8.0 Mw Wenchuan earthquake triggered widespread and large scale landslides in mountainous regions. An approach was used to map and assess landslide susceptibility in a given area. A numerical rating system was applied to five factors that contribute to slope instability. Factors such as lithology, topography, streams and faults have an important influence as event-controlling factors for landslide susceptibility assessment. A final map is provided to show areas of low, medium, and high landslide susceptibility. Areas identified as having high landslide susceptibility were located in the central, northeastern, and far south regions of the study area. The assessment results will help decision makers to select safe sites for emergency placement of refuges and plan for future reconstruction. The maps may also be used as a basis for landslide risk management in the study area.

关键词： landslide susceptibility GIS Wenchuan earthquake Qingchuan area

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Diffraction of plane SV waves by a cavity in poroelastic half-space

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 29-46页

作者： Liang Jianwen and Liu Zhongxian Department of Civil Engineering, Tianjin University, Tianjin 300072, china professor PhD Candidate Department of Civil Engineering Tianjin University Tianjin 300072 China

This paper presents an indirect boundary integration equation method for diffraction of plane SV waves by a 2-D cavity in a poroelastic *** Green＇s functions of compressive and shear wave sources are derived based on Biot＇s theory. The scattered waves are constructed using fictitious wave sources close to the boundary of the cavity, and their magnitudes are determined by the boundary conditions. Verification of the accuracy is performed by：（1） checking the satisfaction extent of the boundary conditions, （2） comparing the degenerated solutions of a single-phased case with well- known solutions, and （3） examining the numerical stability of the solutions. The nature of diffraction of plane SV waves around a cavity in a poroelastic half-space is investigated by numerical examples.

关键词： poroelastic half-space cavity diffraction plane SV waves compressive wave source shear wave source Green's function pore pressure

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