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EXPERIMENTAL STUDY OF LANDSLIDE DAM-BREAK FLOOD OVER ERODIBLE BED IN OPEN CHANNELS

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Journal of Hydrodynamics 2009年第1期21卷 124-130页

作者： YAN Jun CAO Zhi-xian LIU Huai-han CHEN Li state key laboratory of Water Resources and Hydropower engineering Science Wuhan University Wuhan 430072China Changjiang Waterway Institute of Planning Design and Research Wuhan 430011 China

Large-scale landslide dams may block the river flow and cause inundation upstream, and subsequently fail and result in severe flooding and damage in the downstream. The need for enhanced understanding of the inundation and flooding is evident. This article presents an experimental study of the inundation and landslide dam-break flooding over erodible bed in open channels. A set of automatic water-level probes is deployed to record the highly transient stage, and the post-flooding channel bed elevation is measured. New experimental data resources are provided for understanding the processes of landslide-induced flooding and for testing mathematical rivers models.

关键词： landslide dam dam-break sediment transport

An Analysis Method of Business Application Framework

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wuhan university Journal of Natural Sciences 2001年第Z1期6卷 218-223页

作者： He Ke\|qing 1,Fan Hui hua 1,Ying Shi 2 1.Department of Computer Science, wuhan university, wuhan 430072, china 2.state {4. laboratory of software engineering, wuhan university, wuhan 430072, china Department of Computer Science Wuhan University Wuhan China state key laboratory of software {4. Wuhan University Wuhan China

We discuss the evolution of object oriented software development process based on software pattern. For developing mature software framework and component, we advocate to elicit and incorporate software patterns for ensuing quality and reusability of software frameworks. On the analysis base of requirement specification for business application domain, we present analysis method and basic role model of software framework. We also elicit analysis pattern of framework architecture, and design basic role classes and their structure.

关键词： object oriented software framework analysis pattern of architecture component role model

THEORETICAL ANALYSIS AND NUMERICAL SIMULATION OF TURBULENT FLOW AROUND SAND WAVES AND SAND BARS

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Journal of Hydrodynamics 2009年第2期21卷 292-298页

作者： LIU Shi-he XIONG Xiao-yuan LUO Qiu-shi state key laboratory of Water Resource and Hydropower engineering Science Wuhan University Wuhan 430072 China School of Water Resource and Hydropower Wuhan University Wuhan 430072 China Changjiang River Administration of Navigation Affairs MC Wuhan 430014 China

Natural rivers usually possess sand waves and sand bars. In this article, the rapid distortion theory was used to study the turbulent flow over sand waves. The results show that the pre-existing sheafing motion and upstream anisotropy of the turbulence flow would have significant effect on the turbulent structures, and hence the memory effect should be taken into consideration. Furthermore, the 2-D mathematical model was employed to simulate the unsteady flow around the Taiping Sand Bar in the lower reach of the Yangtze River and the time step effect on the unsteady flow simulation with the implicit scheme was discussed at the same time. The results show that the implicit scheme keeps effective until the time step reaches a certain number, and the calculated water levels and velocities are in agreement with the observed data.

关键词： sand wave sand-bar rapid distortion theory numerical simulation

Building Distributed Web GIS: A Mobile Agent Based Approach

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wuhan university Journal of Natural Sciences 2001年第Z1期6卷 474-481页

作者： jhguan@*** Guan Ji hong 1 , Zhou Shui geng 2 , Bian Fu ling 3, Meng Ling kui 3 1. School of Computer, wuhan university, wuhan 430072, china 2. state {4. laboratory of software engineering, wuhan university, wuhan 430072, Chin School of Computer Wuhan University Wuhan China state key laboratory of software {4. Wuhan University Wuhan China College of Remote Sensing and Information engineering Wuhan University Wuhan China

The diversity of GISs and the wide spread availability of WWW have led to an increasing amount of research on integrating a variety of heterogeneous and autonomous GISs in a cooperative environment to construct a new generation of GIS characterizing in open architecture, distributed computation, interoperability, and extensibility. Our on going research project MADGIS (Mobile Agent based Distributed Geographic Information System) is reported, in which we propose the architecture of MADGIS to meet the requirements of integrating distributed GIS applications under Internet environment. We first describe the architecture of MADGIS, and detailed discussions focusing on the structure of client site, server site and mobile agent in MADGIS. Then we explore key techniques for MADGIS implementation.

关键词： distributed GIS mobile agent architecture mobility interoperability

CONVERGENCE RATES FOR A CLASS OF EVOLUTIONARY ALGORITHMS WITH ELITIST STRATEGY

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Acta Mathematica Scientia 2001年第4期21卷 531-540页

作者：丁立新康立山 state key Lab of software engineering Wuhan University Wuhan 430072 China

This paper discusses the convergence rates about a class of evolutionary algorithms in general search spaces by means of the ergodic theory in Markov chain and some techniques in Banach algebra. Under certain conditions that transition probability functions of Markov chains corresponding to evolutionary algorithms satisfy, the authors obtain the convergence rates of the exponential order. Furthermore, they also analyze the characteristics of the conditions which can be met by genetic operators and selection strategies.

关键词： convergence rate Markov chain Banach algebra genetic operator elitist selection evolutionary algorithms

HAUSDORFF DIMENSION OF GENERALIZED STATISTICALLY SELF-AFFINE FRACTALS

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Acta Mathematica Scientia 2004年第3期24卷 421-433页

作者：余旌胡丁立新 wuhan Institute of Physics and Mathematics The Chinese Academy of Sciences Wuhan 430071 China state key laboratory of software {4. Wuhan University Wuhan 430072 Chinahe authors consider generalized statistically self-affine recursive fractals K with random numbers of subsets on each level. They obtain the Hausdorff dimensions of K without considering whether the subsets on each level are non-overlapping or not. They also give some examples to show that many important sets are the special cases of their models.

The authors consider generalized statistically self-affine recursive fractals K with random numbers of subsets on each level. They obtain the Hausdorff dimensions of K without considering whether the subsets on each level are non-overlapping or not. They also give some examples to show that many important sets are the special cases of their models.

关键词： Self-affine contraction map statistically recursive set statistically self-affine set Hausdorff measure Hausdorff dimension singular value function

Image City sharing platform and its typical applications

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Science china(Information Sciences) 2011年第8期54卷 1738-1746页

作者： SHAO ZhenFeng & Li DeRen state key laboratory for Information engineering in Surveying,Mapping and Remote Sensing,{4. university,{4. 4.0079,china state key laboratory for Information engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan China

In this paper,the trend of urban spatial information sharing service from the electronic map to image is analyzed and its sharing framework based on service-oriented architecture is ***,the service implementation,feedback data service procedure and its processing service model are explored. Based on the software with independent intellectual property rights,image city of Taizhou is developed as an example to realize various image data and processing servicesLastly,the bright future prospects of image city are described.

关键词： Image City service-oriented architecture image data service function service model service

A 2-D HYDRODYNAMIC MODEL FOR THE RIVER,LAKE AND NETWORK SYSTEM IN THE JINGJIANG REACH ON THE UNSTRUCTURED QUADRANGLES

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Journal of Hydrodynamics 2010年第3期22卷 419-429页

作者： ZHANG Xi-bing HU De-chao WANG Min state key laboratory of Water Resources and Hydropower engineering Science Wuhan University Wuhan430072 China Yangtze River Scientific Research Institute Wuhan 430010 China state key laboratory of Hydroscience and engineering Tsinghua University Beijing 100084 China

The main river, the Dongting Lake and river networks in the Jingjiang reach of the Yangtze River constitute a complex water system, for which a full 2-D hydrodynamic model is established instead of the traditional 1-D or compound models for simulation of such complex systems, based on the latest developments of computer technologies and numerical methods. To better handle irregular boundaries and keep the computation cost well in a reasonable limit, unstructured grids of moderate scale are used. In addition, a dynamic boundary tracking method is proposed to simulate variable flow domains at different floods, especially, when the moderate scale gird can not describe flows in narrow river-network channels at low water levels. The t9 semi-implicit method and the Eulerian-Lagrangian Method （ELM） are adopted, which make the model unconditionally stable with respect to the gravity wave speed and Courant number restrictions. Properties and efficiency of the model are discussed, and it is concluded that the new model is robust and efficient enough for the simulation of a big, complex water system. Validation tests show that the simulation results agree well with field data. It takes about 0.96 h to complete the computation of a 76 d flood, which indicates that the model is efficient enough for engineering applications.

关键词： 2-D numerical model river network unstructured grid semi-implicit Eulerian-Lagrangian Method (ELM) boundarytracking

SOME PROPERTIES OF GALTON-WATSON BRANCHING PROCESSES IN VARYING ENVIRONMENTS

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Acta Mathematica Scientia 2010年第4期30卷 1105-1114页

作者：余旌胡许芳 Department of Mathematics School of Science Wuhan University of Technology state key laboratory of software {4. Wuhan University wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

This article deals with some properties of Galton-Watson branching processes in varying environments. A necessary and suffcient condition for relative recurrent state is presented, and a series of ratio limit properti... 详细信息

关键词： Branching processes varying environments non-homogeneous relative recurrent transition probability ratio theorem