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Eigen solutions of internal waves over subcritical topography

Acta Oceanologica Sinica 2011年第2期30卷 1-8页

作者： DAI Dejun WANG Wei ZHANG Qinghua QIAO Fangli YUAN Yeli The First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic AdministrationQingdao 266061 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 ChinaP~eceived 13 June 2010 accepted 2 December 2010

Diapycnal mixing plays an important role in the ocean *** waves are a kind of bridge relating the diapycnal mixing to external sources of mechanical *** in obtaining eigen solutions of internal waves over curved topography is a limitation for further theoretical study on the generation problem and scattering *** this study,a kind of transform method is put forward to derive the eigen solutions of internal waves over subcritical topography in twodimensional and linear *** transform converts the curved topography in physical space to flat bottom in transform space while the governing equation of internal waves is still hyperbolic if proper transform function is ***,one can obtain eigen solutions of internal waves in the transform *** examples of transform functions,which convert the linear slope,the convex slope,and the concave slope to flat bottom,and the corresponding eigen solutions are illustrated.A method,using a polynomial to approximate the transform function and least squares method to estimate the undetermined coefficients in the polynomial,is introduced to calculate the approximate expression of the transform function for the given subcritical topography.

关键词： internal waves transform method eigen solutions subcritical curved topography

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Propagation of internal waves up continental slope and shelf

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Chinese Journal of Oceanology and Limnology 2008年第4期26卷 450-458页

作者：戴德君王伟乔方利袁业立相文玺 The First Institute of Oceanography SOA Key Laboratory of Marine Science and Numerical Modeling.SOA Physical Oceanography Laboratory Ocean University of China National Marine Data and Information Service

In a two-dimensional and linear framework, a transformation was developed to derive eigensolutions of internal waves over a subcritical hyperbolic slope and to approximate the continental slope and shelf. The transformation converts a hyperbolic slope in physical space into a flat bottom in transform space while the governing equations of internal waves remain hyperbolic. The eigensolutions are further used to study the evolution of linear internal waves as it propagates to subcritical continental slope and shelf. The stream function, velocity, and vertical shear of velocity induced by internal wave at the hyperbolic slope are analytically expressed by superposition of the obtained eigensolutions. The velocity and velocity shear increase as the internal wave propagates to a hyperbolic slope. They become very large especially when the slope of internal wave rays approaches the topographic slope, which is consistent with the previous studies.

关键词： internal waves velocity and velocity shear hyperbolic slope transform method

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An Efficient Approach to Handling Functional Dependence Loops

An Efficient Approach to Handling Functional Dependence Loop...

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The 8th International Conference on Reliability,Maintainability and Safety(ICRMS 2009)

作者： Joanne Bechta Dugan Brock A.Morrissette Blectrical and Computer Engineering University of Virginia Charlouesville VAUSA

＜正＞The traditional approach to handling functional dependence loops is based on Markov models,which are inefficient due to the well-known state space explosion problem. This paper proposes a new and efficient approach to handling functional dependence loops in the system reliability analysis. Based on the divide-and-conquer strategy,the approach transforms a system with functional dependence loops into subsystems without dependence or loops,which can then be solved using efficient combinatorial *** proposed approach is applicable to analyzing complex systems with general component time-to-failure *** basics and advantages of the proposed approach are illustrated through a detailed analysis of an example.

关键词： functional dependence loop reliability transform method

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