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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Development of bedforms due to waves blocked by a counter current
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Development of bedforms due to waves blocked by a counter current

机译：由于响应电流阻塞的波浪而导致的朝塔窗体

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Experiments are conducted in a laboratory flume on the propagation of a surface wave against unidirectional flow with a sediment bed. This article presents the spatial variation of bedforms induced by the wave-blocking phenomenon by a suitably tuned uniform fluid flow and a counter-propagating wave. The occurrence of wave-blocking is confirmed by finding a critical wave frequency in a particular flow discharge in which the waves are effectively blocked and is established using the linear dispersion relation. The purpose of this work is to identify wave-blocking and its influence on the development of bedforms over the sediment bed. Interestingly bedform signatures are observed at a transition of bedforms in three zones, with asymmetric ripples having a steeper slope downstream face induced by the incoming current, followed by flat sand bars beneath the wave-blocking zone and more symmetric ripples below the wave-dominated region at the downstream. This phenomenon suggests that the sediment bed is segmented into three different regions of bed geometry along the flow. The deviations of mean flows, Reynolds stresses, turbulent kinetic energy, and power spectral density due to the wave-blocking phenomenon are presented along the non-uniform flow over sediment bed. The bottom shear stress, bed roughness and stochastic nature of the bedform features are also discussed. The results are of relevance to engineers and geoscientists concerned with contemporary process as well as those interested in the interpretation of palaeoenvironmental conditions from fossil bedforms. (c) 2019 John Wiley & Sons, Ltd.
机译：实验在实验室水下进行，在表面波与沉积床上的单向流动的传播。本文介绍了通过适当调整的均匀均匀流体流动和反向传播波引起的波阻挡现象诱导的叶形空间变化。通过在特定流动放电中找到临界波频率来确认波阻塞的发生，其中使用线性色散关系建立波浪的特定流动放电。这项工作的目的是识别波浪阻塞及其对沉积物床上弯曲的影响。有趣的是在三个区域的朝向叶形转变的转变中观察有趣的啮盘签名，其具有由进入电流引起的陡峭斜坡下游面的不对称涟漪，然后在波阻挡区下方的扁平砂杆以及波托区域下方的更称对称的涟漪在下游。这种现象表明沉积床沿着流动分段为床几何形状的三个不同区域。沿着沉积物床的非均匀流动，呈现平均流量，雷诺应力，湍流动能，湍流动能和功率谱密度的偏差。还讨论了床泡特征的底部剪切应力，床粗糙度和随机性质。结果与与当代进程有关的工程师和地球科学家以及对从化石床形式解释古环境条件的工程师和地球科学家有关。 （c）2019 John Wiley＆Sons，Ltd。

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