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Sediment Bed-Load Transport: A Standardized Notation

机译：沉积物床上装载运输：标准化符号

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Morphodynamic processes on Earth are a result of sediment displacements by the flow of water or the action of wind. An essential part of sediment transport takes place with permanent or intermittent contact with the bed. In the past, numerous approaches for bed-load transport rates have been developed, based on various fundamental ideas. For the user, the question arises which transport function to choose and why just that one. Different transport approaches can be compared based on measured transport rates. However, this method has the disadvantage that any measured data contains inaccuracies that correlate in different ways with the transport functions under comparison. Unequal conditions also exist if the factors of transport functions under test are fitted to parts of the test data set during the development of the function, but others are not. Therefore, a structural formula comparison is made by transferring altogether 13 transport functions into a standardized notation. Although these formulas were developed from different perspectives and with different approaches, it is shown that these approaches lead to essentially the same basic formula for the main variables. These are shear stress and critical shear stress. However, despite the basic structure of these 13 formulas being the same, their coefficients vary significantly. The reason for that variation and the possible effect on the bandwidth of results is identified and discussed. A further result is the finding that not only shear stress affects bed-load transport rates as is expressed by many transport formulas. Transport rates are also significantly affected by the internal friction of the moving sediment as well as by the friction fluid-bed. In the case of not fully rough flow conditions, also viscous effects and thus the Reynolds number becomes of importance.
机译：地球上的形态学过程是水流量的沉积物或风的作用的结果。沉积物运输的重要组成部分用永久性或间歇性接触床进行。过去，基于各种基本思想，已经开发了许多床上运输速率的方法。对于用户来说，问题出现了选择哪种传输功能以及为什么这一点。可以基于测量的运输速率进行比较不同的运输方法。然而，该方法具有缺点，即任何测量数据都包含以不同方式相关的不准确性，在相比之下的运输功能。如果在函数开发期间的测试数据集合到测试数据集的部分，则也存在不平等的条件，但其他则为其他问题。因此，通过将共13个运输功能转移到标准化符号中来制造结构公式比较。虽然这些公式是从不同的观点和不同方法开发的，但结果表明这些方法导致主要变量基本相同的基本公式。这些是剪切应力和临界剪切应力。然而，尽管这些13公式的基本结构相同，但它们的系数显着变化。鉴定并讨论了该变化的原因和对结果带宽的可能影响。另一个结果是发现不仅剪切应力影响床加载传输速率，如多种传输式表达。通过移动沉积物的内部摩擦和摩擦流体床的内部摩擦，运输率也显着影响。在没有完全粗糙的流量条件的情况下，也粘性效果，因此雷诺数变得重要性。

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