| 张俊勇,陈 立,王志国,张春燕.河流自然模型试验时效的研究[J].水利学报,2006,37(3):0365-0370 |
| 河流自然模型试验时效的研究 |
| Investigation on valid duration of natural river model |
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| DOI： |
| 中文关键词: 河流自然模型 时效 相似理论 “空代时”假说 |
| 英文关键词: natural river model valid duration similarity theory ergodic hypothesis |
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| 中文摘要: |
| 在概述河流自然模型试验定义和前人众多试验研究的基础上，讨论了试验时间的确定对河流自然模型试验的意义。结合对概化水槽试验的分析，论述了河流自然模型试验时效的定义、实质及其影响因素，初步得出试验时效与河床组成、河谷比降以及流量的关系，并提出时效的判定指标。通过相似理论以及河段裁弯概化模型试验与天然河流的对比，对其合理性进行了初步验证。最后，引入“空代时”假说，分析了该假说在时效验证中的可行性。 |
| 英文摘要: |
| The natural river model is defined as the physical model of river formed by natural evolution. The effect of experiment duration and the factors influencing the valid duration of model test are analyzed based on the experimental data given by predecessors obtained from conceptual models carried out in flumes. It is found that the valid duration is related to the composition of riverbed material, gradient of river and river discharge, and the index for discriminating the valid duration is proposed. The reasonability of the concept of valid duration is verified by the comparison of model test result with prototype observation for the evolution of a cut-off in Jingjiang River. Furthermore, the concept of ergodic hypothesis is introduced to demonstrate the feasibility of the concept of valid duration for river modeling |
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