Fuzzy Risk Analysis of Harbour Engineering Investment by Hierarchy System Approach     

Lin Shaopei  Zhang Zhongming Professor  Civil  Architectural Engineering Dept.  Shanghai Jiao Tong University  Shanghai Lecturer  Civil  Architectural Engineering Dept.  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1992,(1)

The present risk analysis model of engineering investment is built by fuzzy hierarchy approach under the assumption of maximizing the revenues of the project during its whole life cycle of operation. It can reasonably be expressed by a system evaluation analysis. As a matter of fact, the system, aimed by its system goal can be modelled by a set of factors, constitutively structured by certain links between them, to form a factorial network chart, which represents the essentials of the system behaviours, the nodes of which represent the factors concerned. The weight distribution between factors located at the same level can be determined by the eigen-value problem of a "pair comparison" relation matrix. The weight distribution of factors at each level is successively manipulated until the fuzzy synthetic risk assessment. As an example of risk analysis of engineering investment, a harbour construction project is presented for illustration.  相似文献   

Influence of Energy Directional Spread on Wave Spectral Refraction     

Li Yucheng Professor  Dept. of Civil Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1992,(2)

Pierson- Moskowitz Spectrum, JONSWAP Spectrum as well as Bretschneider- Mitsuyasu Spectrum are used in this paper for analyzing the influence of wave energy directional spread on refraction of wave spectrum due to both current and topography of sea bed. The author's calculation indicates that such kind influence on the characteristic value of wave height as well as the average direction of wave energy propagation can not be ignored.  相似文献   

Some Considerations in Design and Construction of the Wei-Liu Water Supplying Submarine Pipeline     

Fan Yunlin  Chang Dezhi Associate Professor  Dept. of Ocean Eng.  Tianjin University Engineer  Construction Committee of Weihai City  Shandong Province 《中国海洋工程》1991,(4)

The Wei- Liu water supplying submarine pipeline is at present the longest one of the kind in China. It is about 4 kilometers long from Weihai City to Liugong Island in Shandong province. It took only half a year to design and construct it. The project was of a high economic efficiency and some practical experiences were achieved. In this paper a general introduction to the design and construction of this pipeline is presented and such problems as the stability of the pipeline in very soft clay, design of curved slide for launching and estimation of dragging forces are expounded.  相似文献   

Hydrodynamic Forces on Inclined Cylinder due to Waves with Crossing Current     

Li Yucheng  Kang Haigui Sun Dapeng Professor  Dalian University of Technology  Dalian Lecturer  Dalian University of Technology  Dalian Lecturer  Dalian University of Technology  Dalian 《中国海洋工程》1991,(2)

Based on Morison's Equation and linear wave theory, hydrodynamic forces acting on inclined cylinders due to waves and crossing current at an angle of a, are analyzed. A method for calculating exciting forces is proposed. Experimental results show that the proposed method in this paper is feasible and can be used in engineering practice.  相似文献   

A Study on Impervious and Heat-Insulating Performance of Geomembrane Composites Within Breakwater     

Tao Tongkang  Yu Long  Yan Jun Dong Zhiyong Prof.  Senior Engineer  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Graduate Student  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Engineer  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Associate Professor  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1997,(2)

This paper investigates the performance of geomembrane composites used as impervious andheat-insulating lining within a breakwater for a power station.The seepage field,distribution ofstress-strain contour and seepage discharge of hot water which has been treated as the inner thermalsource in the calculation of heat-insulation,have been given by three-dimensional calculation method coup-ling seepage with stress.The results indicate that the impervious and heat-insulation effect ofgeomembrane composites is significant.  相似文献   

Investigation on the Performance of Articulated Buoys     

Feng Bojun  Huang Guoliang Liu Tianwei Associale Professor  Shanghai Jiao Tong University  Shanghai Engineer  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1995,(4)

Articulated buoys become more and more popular by the marine management departments as a new type of aids to navigation, for they possess an excellent hydrodynamic performance with small static heel angle in wind and current and small rolling in wave and accurate position. The structure of articulated buoys and calculation method of their hydrodynamic performance are introduced in this paper. A scries of experiments has been conducted in the State Key Laboratory of Ocean Engineering of China and useful results achieved for providing a design optimization basis.  相似文献   

A Numerical Computation Method for Current Field in Tidal zone     

Wei Shoulin Xiao Rong Professor  Ocean University of Qingdao  Qingdao  . Teaching Assistant  Ocean University of Qingdao  Qingdao 《中国海洋工程》1994,(1)

- In this paper, a numerical computation method is developed for the computation of current field in the tidal zone, using the well-point method and ADI method. The computational results agree well with the general variation of current field in the tidal zone.  相似文献   

Analytical Study on Transmission and Reflection of Non-Linear Shallow Water Waves     

Miao Guoping Liu Yingzhong Professor  Dept. of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1991,(1)

The analytical study is made by using the method of matched asymptotic expansions on the transmission and reflection of solitary waves and cnoidal waves on two-dimensional floating bodies. The solutions give explicitly the variation pattern of the transmitted waves and the characteristics of the reflected waves, including the wave profile, amplitude, phase shift and evolution. The effects of the gap between the body and the sea bottom on the transmission and reflection of those waves are also discussed.  相似文献   

Evalution of Application of p-y Curve Method in Offshore Engineering Foundation     

Jin Weiliang  Zhu Yuming  Li Linpu Associate Professor  Dr. -Eng.  Zhejiang University  Hangzhou Engineer  Metallurgical Building Design  Research Institute  Beijing Associate Professor  Dalian University of Technology  Dalian 《中国海洋工程》1993,(4)

- Based on the Mohr-Coulomb failure principle and Rankine's theory, the laterally loaded pile ultimate resistance formulas of sand and soft clay proposed by Reese and Matlock respectively are discussed in this paper. The authors put forward the modified ultimate resistance formulas on the basis of which the ultimate resistance formula is developed for horizontally loaded pile in multi-layer soil in consideration of the effect of the overburden soil pressure on the calculation of soil layer. It is significant to the correct application of the ultimate resistance formulas in API and ZCS Rules into offshore engineering.  相似文献   

Study on the Improvement of Sea-Entering Waterway in the Changjiang Estuary     

Shen Huanting  Xu Haigen Ma Xiangqi Professor 《中国海洋工程》1992,(3)

The Changjiang Estuary is the doorway of the Shanghai Harbour and the throat for the six provinces in the Changjiang River drainage area. However the minimum water depth of the waterway in the estuary is only about six meters, so that the development of the Shanghai Harbour and the utilization of water transportation on the Changjiang River have been greatly restrained. Since 1975, the depth of the sea-entering waterway of the Changjiang Estuary has been successfully increased by one meter. This article has made a comprehensive summing-up about the selection of waterways, the determination of the line for dredging and disposal of the dredged material, thus providing reference data for future work in increasing the depth of the waterway of the Changjiang Estuary and for controlling similar waterways of other estuaries.  相似文献