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METAMODELLING APPROACH TO DESIGN THE ALLUVIAL CHANNELS AT INCIPIENT MOTION

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Abstract：
The design of an alluvial channel for critical conditions requires information about four basic parameters, i.e., particle size d, water depth y, energy slope Sf and average velocity u. Most of the investigators use a standard or modified form of the critical Shields' parameter to define the incipient motion of a particular grain size. Shields' diagram describes an iterative process of determining the incipient motion parameters. To design a process that does not require iteration, one must know the resistance relationship. The absence of a universal resistance equation increases the difficulty of defining the model. Metamodelling techniques are widely used in engineering designs to simulate a complex system. This article describes a Metamodel, which employs the radial basis function (RBF)network to predict the average velocity u and energy slope Sf based on experimental data of incipient condition. With the help of the Metamodel generated by the RBF network, design curves have been presented to predict the u and Sf based on known values of the particle size and water depth. It has been found that this model improves the predictability of incipient motion.
作者：
Author： Achanta Ramakrishna RAO    Bimlesh KUMAR    Gopu SREENIVASULU
作者单位： Civil department, ⅡSc, India
期 刊： 国际泥沙研究（英文版）   SCI
Journal： INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
年，卷(期)： 2007, 22(3)
分类号： TV1
Keywords： Incipient motion 知识脉络    Metamodel 知识脉络    Multiquadric 知识脉络    Prediction error 知识脉络    Radial-Basis function 知识脉络    Sediment transport 知识脉络    Shields' diagram 知识脉络   
机标分类号： TV1 P7
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