ABSTRACT Direct numerical simulations of lock-exchange turbidity currents with small Reynolds number were often assumed to well represent turbidity currents with large Reynolds number. Here, this assumption is examined using a layer-averaged numerical model. It is shown that in the initial stage the current front position converges if the Reynolds number approaches certain threshold values. However, at later stages, turbidity currents with larger Reynolds number propagate faster and farther. This is because, by definition, a larger Reynolds number corresponds to more sediment mass carried by the current, and thus higher driving force. Furthermore, turbidity currents with the same Reynolds number can correspond to very different front positions and deposition profiles, as the Reynolds number depends on both current thickness and concentration.

中文翻译：

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雷诺数对浊流影响的层平均数值研究

摘要 小雷诺数锁定交换浊流的直接数值模拟通常被认为可以很好地代表大雷诺数的浊流。在这里，使用层平均数值模型检查该假设。结果表明，在初始阶段，如果雷诺数接近某个阈值，则当前前沿位置会收敛。然而，在后期阶段，具有较大雷诺数的浊流传播得更快更远。这是因为，根据定义，较大的雷诺数对应于电流携带的更多沉积物质量，因此驱动力更高。此外，具有相同雷诺数的浊流可能对应于非常不同的前沿位置和沉积剖面，因为雷诺数取决于电流厚度和浓度。