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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The impact of internal waves on upper continental slopes: insights from the Mozambican margin (southwest Indian Ocean)
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The impact of internal waves on upper continental slopes: insights from the Mozambican margin (southwest Indian Ocean)

机译：内部波对上大陆斜坡的影响：莫桑比克边缘（西南印度洋）的见解

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摘要

Evidences of sedimentation affected by oceanic circulation, such as nepheloid layers and contourites are often observed along continental slopes. However, the oceanographic processes controlling sedimentation along continental margins remain poorly understood. Multibeam bathymetry and high-resolution seismic reflection data revealed a contourite depositional system in the Mozambican upper continental slope composed of a contourite terrace (a surface with a gentle seaward slope dominated by erosion) and a plastered drift (a convex-shape sedimentary deposit). A continuous alongslope channel and a field of sand dunes (mainly migrating upslope), formed during Holocene, were identified in the contourite terrace at the present seafloor. Seismic reflection data of the water column show internal waves and boluses propagating in the pycnocline near the upper slope. The channel and the dunes are probably the result of the interaction of the observed internal waves with the seafloor under two different conditions. The alongslope channel is located in a zone where intense barotropic tidal currents may arrest internal solitary waves, generating a hydraulic jump and focused erosion. However, upslope migrating dunes may be formed by bottom currents induced by internal solitary waves of elevation propagating landwards in the pycnocline. These small-scale sedimentary features generated by internal waves are superimposed on large-scale contouritic deposits, such as plastered drifts and contourite terraces, which are related to geostrophic currents. These findings provide new insights into the oceanographic processes that control sedimentation along continental margins that will help interpretation of palaeoceanographic conditions from the sedimentary record. (c) 2020 John Wiley & Sons, Ltd.
机译：沿着大陆斜坡常常观察受海洋循环影响的沉淀的证据，例如肾盂层和轮廓。然而，控制沿着大陆边距的沉降的海洋过程仍然明白。多芯浴浴和高分辨率地震反射数据在莫桑比克上陆坡上揭示了一种轮廓岩沉积系统，该系统在莫桑比克上部坡度组成的型室内露台（一个带有侵蚀的平缓的海坡的表面）和涂抹漂移（凸形沉积沉积物）。在本海底的Contulite露台中鉴定了在全新世期间形成的连续沿着沿着沿着沿沿沿着沿着沿着沿着沿着全新生形成的沙丘（主要是迁移的上坡）。水柱的地震反射数据显示在上斜率附近的斑块中传播的内波和钢管。通道和沙丘可能是观察到的内部波与海底在两个不同条件下的相互作用的结果。沿着沿着沿着波高的波纹潮流的区域，可以抑制内部孤独的波浪，产生液压跳跃和聚焦侵蚀。然而，Upslope迁移沙丘可以通过由曲线划线的内部孤立波的内部孤立波引起的底部电流形成。由内波产生的这些小型沉积特征叠加在大规模的Contoutic沉积物上，例如涂抹漂移和轮廓座露台，这与热脱节电流有关。这些调查结果为沿着大陆边缘控制沉降的海洋过程提供了新的见解，这将有助于从沉积记录解释古生物的情况。 （c）2020 John Wiley＆Sons，Ltd。

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