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地基基础对风力发电机塔架系统地震响应的影响研究

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水力发电学报 2011年第6期30卷 122-126页

作者：曹青张燎军汪清河海大学水利水电学院南京210098

建立了风力机塔架、基础与地基的相互作用三维有限元模型,采用改进的拉格朗日有限元格式、接触问题的约束函数法和Newmark自动变步长的动力求解方法,分析了P-Δ效应、地基及地基与塔架基础的接触形式对塔架的自振特性和地震时程响应的... 详细信息

建立了风力机塔架、基础与地基的相互作用三维有限元模型,采用改进的拉格朗日有限元格式、接触问题的约束函数法和Newmark自动变步长的动力求解方法,分析了P-Δ效应、地基及地基与塔架基础的接触形式对塔架的自振特性和地震时程响应的影响。分析结果表明:弹性地基及塔架基础与地基土壤滑移接触使得塔架结构的各阶自振频率降低显著,尤其高阶频率影响更甚,同时塔架系统各地震响应值也增大很明显。研究方法和研究成果可为风力机塔架系统的抗震设计提供有益的参考。

关键词：风力发电工程地震响应地基-结构耦合风力发电机塔架接触模型 P-Δ效应

Comparison of heavy metal accumulation by a bloom-forming cyanobacterium,Microcystis aeruginosa

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Science Bulletin 2012年第Z2期 3790-3797页

作者： ZENG Jin 1*,ZHAO DaYong 2,JI YongBan 1 & WU QingLong 1 1 State Key Laboratory of Lake Science and Environment,nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,nanjing 210008,china 2 State Key Laboratory of Hydrology-water resources and Hydraulic engineering,college of Hydrology and water resources,hohai University,nanjing 210098,china

Microcystis aeruginosa is the dominant species during cyanobacterial blooms in freshwater *** the present study,we compared the bioaccumulation characteristics of cadmium(Cd) and zinc(Zn) in Microcystis *** short-term uptake tests,a rapid sorption of Cd and Zn occurred in the first few minutes,with a subsequent slower internalization *** obvious difference was observed between Zn and Cd in terms of their short-term uptake *** efflux experiments,elimination of Zn from the cells was faster than that of *** the 72-h exposure tests,the intracellular Cd concentrations increased with exposure time whereas the intracellular Zn concentrations always reached a *** cellular Cd showed greater variation than the cellular Zn at various free Cd 2+ or Zn 2+ *** differences in Cd and Zn accumulation and elimination indicated that Microcystis cells had a higher bioaccumulation capacity for Cd than for *** field studies,the bioconcentration factor(BCF) of Cd in lake-harvested Microcystis was more than 10 times higher than those of other *** results of the present study strongly suggested that the bloom-forming Microcystis may affect the Cd transportation and biogeochemical cycling in eutrophic freshwater ecosystems.

关键词： Microcystis aeruginosa cadmium zinc bioaccumulation bioconcentration factor

SAFETY EVALUATION AND CORROSPONDING METHODS ON DAMS GRADED BY RISK ANALYSIS

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SAFETY EVALUATION AND CORROSPONDING METHODS ON DAMS GRADED B...

16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS

作者： Weihua Fang② ② Doctor Candidate/Senior Engineer,college of water Conservancy and hydropower engineering,hohai University,nanjing 210098,china

In order to improve the rationality of dam safety evaluation,on the basis of analyzing characteristics of concepts and evaluation criteria of dam safety,all the dams are partitioned into four grades using the simple risk analysis method recommend by ICOLD and corresponding grade index is proposed. And according to different grades,evaluation methods with four different levels are studied and used,including the deterministic evaluation based on the guidelines on dam safety evaluation,the safety evaluation based on risk analysis,comprehensive evaluation based on uncertainty theories and the dynamic fuzzy risk analysis based on dam damage diagnosis & life prediction,corresponding key problems desiring further study are also pointed out. At last,the credibility of the result and the conclusion of dam safety evaluation are discussed by analyzing their uncertainty,corresponding method is presented and the concept of uncertainty of dam safety evaluation is proposed.

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宜昌站洪水流量事件变化规律研究

水电能源科学 2010年第1期28卷 41-43,46页

作者：张楠夏自强江红河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 河海大学水文水资源学院江苏南京210098 华北水利水电学院河南郑州450011

以宜昌水文站1950-2006年洪水极值事件为例，采用Morlet小波函数分析了1～60d洪水流量系列年际变化规律，揭示了洪水极值事件变化的多时间尺度的复杂结构，并根据主周期预测了未来变化。结果表明，该方法方便、有效，为研究水库调度、... 详细信息

以宜昌水文站1950-2006年洪水极值事件为例，采用Morlet小波函数分析了1～60d洪水流量系列年际变化规律，揭示了洪水极值事件变化的多时间尺度的复杂结构，并根据主周期预测了未来变化。结果表明，该方法方便、有效，为研究水库调度、防洪规划、洪水极值流量变化、河流生态系统保护和修复提供了依据。

关键词：洪水流量事件变化小波分析极值尺度周期

基于ABAQUS的四节点三维附加质量单元开发

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水电能源科学 2011年第6期29卷 100-102页

作者：徐磊河海大学水利水电学院江苏南京210098

为在水体—结构动力相互作用问题的有限元分析中实现节点附加质量的批量自动施加,利用ABAQUS软件提供的用户单元子程序接口UEL,开发了四节点三维附加质量单元(M3D4)。算例分析结果表明,M3D4单元可为基于附加质量法的三维水体—结构动力... 详细信息

为在水体—结构动力相互作用问题的有限元分析中实现节点附加质量的批量自动施加,利用ABAQUS软件提供的用户单元子程序接口UEL,开发了四节点三维附加质量单元(M3D4)。算例分析结果表明,M3D4单元可为基于附加质量法的三维水体—结构动力相互作用有限元分析提供简便的处理方法。

关键词：附加质量法 M3D4单元有限单元法 ABAQUS

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河道管理信息系统开发研究

水电能源科学 2009年第3期27卷 130-133页

作者：赵岩缪琴河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 河海大学水文水资源学院江苏南京210098 宿迁市泗洪县水务局江苏宿迁223900

为实现河道管理科学化、规范化、标准化,针对目前河道管理现状及存在的具体问题,以地理信息系统和数据库为支撑,设计开发了具有一定通用性、可移植性和可扩展性的河道管理信息系统。系统实现了河道信息的数字化,并为用户决策提供了强大... 详细信息

为实现河道管理科学化、规范化、标准化,针对目前河道管理现状及存在的具体问题,以地理信息系统和数据库为支撑,设计开发了具有一定通用性、可移植性和可扩展性的河道管理信息系统。系统实现了河道信息的数字化,并为用户决策提供了强大的技术支持。

关键词：河道管理地理信息系统数据库

Deposition and erosion in the fluctuating backwater reach of the Three Gorges Project after upstream reservoir adjustment

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International Journal of Sediment Research 2010年第1期25卷 64-80页

作者： Yongjun LU1,Liqin ZUO2,Rongyao JI3,and Huaixiang LIU4 1Dr.,Prof.,2Ph.D student,3,4Eingineer,nanjing Hydraulic Research Institute,State Key Laboratory of Hydrology-water resources and Hydraulic engineering,nanjing 210029,china. [a] Dr. Prof. State Key Laboratory of Hydrology-Water Resources Hydraulic engineering Nanjing 210029 China [b] Ph.D student State Key Laboratory of Hydrology-Water Resources Hydraulic engineering Nanjing 210029 China [c] Eingineer Nanjing Hydraulic Research Institute State Key Laboratory of Hydrology-Water Resources Hydraulic engineering Nanjing 210029 China

The construction of hydropower projects,such as Xiluodu and Xiangjiaba Reservoirs,in the upper Yangtze River will lead to variations of the incoming water and sediment conditions and in turn changes in the deposition and erosion processes in the fluctuating backwater reach of the Three Gorges Project(TGP).In this paper,based on the water and sediment characteristics,a 2D mathematical model in the boundary-fitting orthogonal curvilinear coordinate system has been employed to predict the space-time changes of sedimentation in the Chongqing reach,part of the fluctuating backwater reach of TGP,in a period of 100 years with repetition of the 1961-1970 hydrological series with and without the construction of upstream *** results show that in the case of natural hydrological series(NHS) without upstream reservoirs,severe deposition occurs in bays with concave bank lines,recirculation flow areas and wide-shallow *** the case with the adjustment of upstream reservoirs,only a little deposition exists in bays with concave bank lines,and the amounts of deposition in the Yangtze River and Jialing River reaches are about 10-20% of those in the case of ***,this is helpful to maintain the effective capacity of the TGP Reservoir and utilize the bank lines of the Chongqing reach.

关键词： Reservoir Adjustment of water and sediment Fluctuating backwater reach Deposition and erosion Mathematical model Chongqing reach Yangtze River Jialing River