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中文摘要：
河工动床模型时间变态常影响试验结果与原型的偏离程度。本文在前人研究基础上，首先分析了产生时间变态的原因及对悬移质动床模型相似的影响。然后通过长江上荆江河段悬移质动床模型，分别开展了三组时间比尺对河床变形相似影响的试验。其结果表明，时间变态程度对河床冲淤变形相似有直接影响。
英文摘要：
Time scale distortion in physical model of river process in alluvial streams always affects the experiment results and deviation to original prototype. On the basis of former researches, the direct reasons causing time scale distortion are analyzed in this paper. However, the effect on physical modeling similarity of suspension river process is also presented. Based on the test of Shangjinjiang reach of Yangtse River, three series of experimentations are done to analyze the effect of time scale on bed distortion. It shows that the degree of time scale distortion has the direct effect on bed deformation similarity.
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