| 范家骅.浑水异重流槽宽突变时的局部掺混[J].水利学报,2005,36(1):0001-0008 |
| 浑水异重流槽宽突变时的局部掺混 |
| Local entrainment of turbid density current in width abrupt changed channel |
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| DOI： |
| 中文关键词: 浑水异重流 非连续流 局部掺混 水槽扩宽 水槽收缩 |
| 英文关键词: turbid density current discontinuous flow local entrainment width abrupt changed channel |
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| 中文摘要: |
| 本文利用浑水异重流水槽实验，改变不同收缩段和扩宽段的槽宽比，研究异重流流经槽宽突然收缩和突然扩宽时的流动特性，观察了槽宽突变断面上下游的流态，以及局部掺混情况，同时测读有关水沙因子。在不考虑沿程掺混因子的情形下，进行理论分析，求得浑水异重流流经突变断面时，上下游水力的泥沙诸因子与局部掺混系数的关系式。根据实测数据建立上下游槽宽比(扩宽与收缩)与局部掺混系数的经验关系式。利用上述诸公式，可计算求得异重流在槽宽突变时，掺混系数的变化和下游断面的水沙值。 |
| 英文摘要: |
| The flow characteristics of turbid density current in the channel with abrupt expansion or abrupt contraction are studied in laboratory. The flow regimes and local entrainment phenomena are carefully observed and the variations of water flow and sediment concentration are measured. The empirical relationship between expansion ratio (or contraction ratio) and local entrainment coefficient is established based on the experimental data. At the same time, the relationships between water-sediment factors and local entrainment coefficient are analyzed theoretically. Based on these relationships the variations of entrainment coefficient and the flow-sediment factors in the width abrupt changed channels can be calculated. |
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