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Multicriteria Analysis of a Capacity Expansion Problem:Damaturu, Northeastern Nigeria as Case Study

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Systems Science and Systems Engineering 1999年第1期9卷 112-118页

作者： Mallam Zaji Bunuq(hohai university, Foreign Students’ Building Room 307, nanjing, 210095, P. R. china.)

Damaturu, the Yobe State Capital is one of the major towns in the semi-arid areas OfNortheastern Nigeria. It lacks adequate water supply. Being a State Capital, rapid improvements in itsinfrastructures including water supply to cope with increased demands are required. Three options forthe expansion of the present water supply system are been considered. These are Groundwater resourceswithin and around the existing system, and surface water schemes from two Dam sites identitied andappraised for this purpose. The Management of the Yobe State Water Board and the State Governmentare faced with the problem of which of these three options to choose. This is a typical capacity expansionproblem within a multicriterion setting in which the choice is to be bassed on economic, environmental,social as well as political considerstions. This paper presents a multicriterion analysis whose result willbe used in forming the basis of an informed decision to be made on why a particular option is to bechosen.

关键词： Damaturu Capacity expansion Multicriteris analysis Ranking.

Calculation and Analysis on the Factors Contribution Rate of the Economic Growth in Jiangsu Province

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Calculation and Analysis on the Factors Contribution Rate of...

NEW METHOD OF SIMULATING CONCENTRATED DRAIN HOLES IN SEEPAGE CONTROL ANALYSIS

2011 International Conference on Management Science and Intelligent Control(ICMSIC 2011)

作者： Guoqing Han Business School hohai university nanjing china Jiahe Cao Business School hohai university nanjing china Hanning Zhang Business School hohai university nanjing china

Based on the Neo-Classical growth model,the paper analyzes the contribution rate of a variety of factor on the economic growth in Jiangsu Province,the result shows that the progress of science and technology and the increasing capital play a leading role in the economic growth of Jiangsu province,but the role of the labor is less important,with it declining year by year.

关键词： C-D productive function Economic growth contribution rate.

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Journal of Hydrodynamics 1999年第3期11卷 27-35页

作者： Zhan Mei li, Su Bao yu , Liu Jun yong, Shen Zhen zhong College of Water Conservancy and Hydropower Engineering, hohai university, nanjing 210098, P.R.china (Received Aug.1, 1998)

In this paper, based upon the basic solution of sink, the approximate solution of single drain hole in finite elements is derived by use of the superposition principle. Then, the theoretical solution is extended to the case of some drain holes in one finite element, and the method is used in seepage control analysis with quick convergence and high accuracy. On the other hand, if the positions of the drain holes are changed, only some control factors of drain holes are changed, but the finite element grid need not to be reformed. Therefore, the method is more suitable in optimal research of seepage control.

关键词： concentrated drain hole approximate solution seepage control optimal research

Preparation and performances of bulk porous Al foams impregnated with phase-change-materials for thermal storage

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Progress in Natural Science:Materials International 2012年第5期22卷 440-444页

作者： Jinghua Jiang a,b,Yingying Zhu b,Aibin Ma a,b,Donghui Yang b,c,Fumin Lu b,Jianqing Chen b,Jun Shi b,Dan Song a,b a National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,hohai university,nanjing 210098,china b College of Mechanics and Materials,hohai university,nanjing 210098,china c Department of Mechanical and Aerospace Engineering,North Carolina State university,Raleigh,NC 27695-7919,USA National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China College of Mechanics and Materials Hohai University Nanjing 210098 China Department of Mechanical and Aerospace Engineering North Carolina State University Raleigh NC 27695-7919 USA

Shape-stabilized phase change materials(PCMs) exhibit desirable thermal storage properties and are used for energy conservation *** study is focused on the preparation and thermal-/dynamic-mechanical properties of the bulk porous Al foams impregnated with organic PCMs such as paraffins and stearic *** results indicated that the new shape-stabilized PCMs composites could be produced by a simple and eco-friendly constant-pressure impregnation *** filling fraction of PCMs was approximately more than 80% for the impregnated samples with vacuuming or without *** shape-stabilized PCMs/Al-foam composites exhibited considerable latent thermal storage potential for good interface,desirable phase-change temperature range and latent heat values(72.9kJ/kg for the paraffin/Al-foam composite and 66.7kJ/kg for the stearic acid/Al-foam composite).Moreover,the impregnation of PCMs improved the dynamic-compression yield strength,durability and resistance to oxidation of Al foams and made its ideal energy-saving materials.

关键词： Phase change materials Porous Al foams Composites Thermal storage Dynamic mechanical properties

Experimental study on three dimensional movements of particles Ⅱ Effects of particle diameter on turbulence characteristics

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International Journal of Sediment Research 2009年第2期24卷 169-176页

作者： Limo TANG1 and Xingkui WANG2 1State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,hohai university, nanjing 210098,china 2 Prof.,State Key Laboratory of Hydroscience and Engineering,Tsinghua university,Beijing 100084,china State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

Based on the 3D PTV(Particle Tracking Velocimetry) measuring system,the 3D movement characteristics of particles with four different diameters were investigated. Under specific flow conditions,the impact of particle diameters on 3D motion of particles was studied,and the turbulence characteristics were analyzed by different statistical methods. The results showed that the turbulence intensity of coarse particle decreased as the diameter increased. In near wall region,the probability density distributions of longitudinal and vertical fluctuation velocities both deviated from the normal distribution;while in the outer region,the probability density distribution of vertical fluctuation velocity approximately agreed with the normal distribution.

关键词： Particle diameter Turbulence Probability density distribution

A process-based model for sediment transport under various wave and current conditions

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International Journal of Sediment Research 2011年第4期26卷 498-512页

作者： Chi ZHANG,Jin-Hai ZHENG,Yi-Gang WANG, Meng-Tao ZHANG,Dong-Sheng JENG,and Ji-Sheng ZHANG 1 Dr.,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,hohai university,1 Xikang Road,nanjing 210098,china, 2 Prof,Corresponding author,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, hohai university,1 Xikang Road,nanjing 210098,china, 3 Prof.,4 Bachelor,6 Assoc.Prof.,College of Harbor,Coastal and Offshore Engineering,hohai university,1 Xikang Road,nanjing 210098,china 5 Prof,Center for Marine Geotechnical Engineering Research,Shanghai Jiao Tong university,Shanghai 200240, china Division of Civil Engineering,university of Dundee,Dundee DD1 4HN,United Kingdom Dr. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University 1 Xikang Road Nanjing 210098 China Prof. Corresponding author State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University 1 Xikang Road Nanjing 210098 China Prof. College of Harbor Coastal and Offshore Engineering Hohai University 1 Xikang Road Nanjing 210098 China Bachelor College of Harbor Coastal and Offshore Engineering Hohai University 1 Xikang Road Nanjing 210098 China Prof. Center for Marine Geotechnical Engineering Research Shanghai Jiao Tong University Shanghai 200240 China Division of Civil Engineering University of Dundee Dundee DD1 4HN United Kingdom Assoc. Prof. College of Harbor Coastal and Offshore Engineering Hohai University 1 Xikang Road Nanjing 210098 China

The purpose of this study is to investigate the capability of a newly developed process-based model for sediment transport under a wide variety of wave and current *** model is based on the first-order boundary layer equation and the sediment advection-diffusion *** particular,a modified low Reynolds number k-e model is coupled to provide the turbulence *** model verifications have been performed by simulating a number of laboratory experiments,covering a considerable range of hydrodynamic conditions such as sinusoidal waves,asymmetric waves and wave-current *** model provides satisfactory numerical results which agree well with the measured results,including the time-averaged/dependent sediment concentration profiles and sediment flux profiles,as well as the time series of concentration at given *** observed influences of wave orbital velocity amplitude,wave period and sediment grain size are correctly reproduced,indicating that the fundamental physical mechanisms of those processes are properly represented in the *** is revealed that the present model is capable of predicting sediment transport under a wide range of wave and current conditions,and can be used to further study the morphodynamic processes in real coastal regions.

关键词： Sediment transport Wave Current Numerical model

THREE-DIMENSIONAL SIMULATION FOR EFFECTS OF BED DISCORDANCE ON FLOW DYNAMICS AT Y-SHAPED OPEN CHANNEL CONFLUENCES

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Journal of Hydrodynamics 2007年第5期19卷 587-593页

作者： WANG Xiao-gang YAN Zhong-min GUO Wei-dong College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China College of Water Conservancy Shenyang Agricultural University Shenyang 110161 China

Channel confluences are universally present in nature. They can be divided into two types： asymmetrical river confluences and symmetric river confluences. The latter is also called as the Y-shaped confluences. Most of previous work has paid more attention to the asymmetrical river confluences, but few studies have been conducted on the Y-shaped confluences. In this article, the effects of bed discordance on the flow patterns at ＂Y＂ shaped open-channel confluences were studied by using a 3-D numerical simulation. It is proved that the model can undertake quantitative assessment of the flow at confluences. The results indicate that there are a lot of differences between the Y-shaped confluence and asymmetrical confluence. The discordant bed height plays an important role at the Y-shaped junction.

关键词： Y-shaped junction discordant bed height,separation zone numerical simulation turbulent intensity,secondary flow lateral mixing

NUMERICAL MODEL FOR FLOW THROUGH SUBMERGED VEGETATION REGIONS IN A SHALLOW LAKE

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Journal of Hydrodynamics 2011年第2期23卷 170-178页

作者： WANG Pei-fang WANG Chao Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry ot Education College of Environment Hohai University Nanjing 210098 China

Aquatic vegetation has a significant impact on water currents. To evaluate the effects of changes in the aquatic vegetation on water currents of different velocity, a 3-D hydrodynamic model was then developed by taking into consideration of the additional hydraulic resistance of the aquatic plants. The Navier- Stokes equations were then solved using the SIMPLE method and the k - e＂ turbulence model. Calculations using the established models were used to forecast the vertical distribution of the horizontal velocity and horizontal flow under the transmission conditions of the South-North Water Diversion in the Nansi Lake. And comparative calculation for the flow velocity was also performed using the simplified method of assigning a high roughness coefficient to the lake bed in the same area. Results suggest that adding additional hydraulic resistance of the aquatic plants is feasible. The calculation errors between simulation result and the field observed data are smaller than 15%, while, those errors are up to 35% if the influence of aquatic vegetation is dealt with the simplified method.

关键词： lakes numerical models hydraulic resistance aquatic vegetation

Risk analysis model for landslide mass of high slope in dam area

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Science china(Technological Sciences) 2008年第S2期51卷 25-31页

作者： GU ChongShi1,2,HE XianFeng3,4,WU ZhongRu1,2 & SU HuaiZhi1,2 1 College of Water Conservancy and Hydropower Engineering,hohai university,nanjing 210098,china 2 National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,nanjing 210098,china 3 Yellow River Institute of Hydraulic Research,Zhengzhou 450003,china 4 Embankment Security Defect Prevention and Control Engineering Research Center of MWR,Zhengzhou 450003,china College of Water Conservancy and Hydropower Engineering Hohai University Nanjing China National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Nanjing China Yellow River Institute of Hydraulic Research Zhengzhou China Embankment Security Defect Prevention and Control Engineering Research Center of MWR Zhengzhou China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** concept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established according to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk