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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effect of physical variables on particle critical erosion shear stress: Hydrostatic pressure, slope and changes in water density
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Effect of physical variables on particle critical erosion shear stress: Hydrostatic pressure, slope and changes in water density

机译：物理变量对颗粒临界侵蚀剪切应力的影响：静水压力，斜率和水密度变化

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摘要

In recent years, the importance of organo-mineral aggregates (OMAs) in the transport of organic material from the continental shelf to the deep ocean floor has been recognized. Attempts to model the transport of these OMAs rely on measurements of several physical parameters, such as the critical erosion shear stress. However, due to technical constraints, such measurements are not done in situ, making it difficult to assess the impact of environmental parameters on the measurements made, and their accuracy in representing the study site. Changes in hydrostatic pressure, slope angle and water density potentially can affect the critical erosion shear stress of OMAs. Using new methodologies, we found no measurable effect of hydrostatic pressure variation on the OMAs' resuspension behavior. Changes in slope angle resulted in the decrease of u~*_(cri) up to 35%. The u~*_(cri) decreased by 9% with an exchange with denser water, and it increased by 6% with an exchange with lighter water. These changes were temporary, and after a 3-h stabilization the u~*_(cri) returned to the original value. We will discuss the future applications of these results on modeling of particle transport.
机译：近年来，人们已经认识到有机矿物集合体（OMA）在有机材料从大陆架到深海底的运输中的重要性。尝试对这些OMA的传输进行建模的方法依赖于几个物理参数的测量，例如临界侵蚀剪切应力。但是，由于技术限制，此类测量无法在原位进行，因此难以评估环境参数对所进行的测量的影响及其代表研究地点的准确性。静水压力，倾斜角和水密度的变化可能会影响OMA的临界侵蚀剪切应力。使用新的方法，我们发现静水压力变化对OMA的重悬行为没有可测量的影响。倾斜角的变化导致u〜* _（cri）降低35％。与浓水交换后，u〜*（cri）降低了9％，与轻水交换后，其增加了6％。这些变化是暂时的，在稳定3小时后，u〜* _（cri）返回到原始值。我们将讨论这些结果在粒子传输模型中的未来应用。

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