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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sediments and water fluxes in a muddy coastline: interplay between waves and tidal channel hydrodynamics
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Sediments and water fluxes in a muddy coastline: interplay between waves and tidal channel hydrodynamics

机译：泥泞海岸线上的泥沙和水通量：波浪和潮汐通道水动力之间的相互作用

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摘要

Tidal channels are ubiquitous in muddy coastlines and play a critical role in the redistribution of sediments, thus dictating the general evolution of intertidal landforms. In muddy coastlines, the morphology of tidal channels and adjacent marshes strongly depends on the supply of fine sediments from the shelf and on the resuspension of sediments by wind waves. To investigate the processes that regulate sediment fluxes in muddy coastlines, we measured tidal velocity and sediment concentration in Little Constance Bayou, a tidal channel in the Rockefeller State Wildlife Refuge, Louisiana, USA. The tidal measurements were integrated with measurements of wave activity in the bay at the mouth of the channel, thus allowing the quantification of feed-backs between waves and sediment fluxes. Results indicate that the sediment concentration in the channel is directly related to the wave height in the adjacent bay during flood and high slack water, whereas the concentration during ebb depends on local channel velocity. Moreover, the sediment flux during ebb is of the same order of magnitude as the sediment flux during the previous flood, indicating that only a small fraction of transported sediments are stored in the marsh during a tidal cycle. Finally, very low tides, characterized by high ebb velocities, export large volumes of sediment to the ocean.
机译：潮汐通道在泥泞的海岸线上无处不在，在沉积物的重新分配中起关键作用，因此决定了潮间带地貌的总体演变。在泥泞的海岸线上，潮汐河道和邻近沼泽的形态在很大程度上取决于架子上精细沉积物的供应以及风波对沉积物的再悬浮。为了研究调节泥泞海岸线上的泥沙流量的过程，我们在美国路易斯安那州洛克菲勒州野生动物保护区的潮汐通道Little Constance Bayou中测量了潮汐速度和泥沙浓度。潮汐测量与航道口海湾的波浪活动测量结果相结合，因此可以量化波浪和沉积物通量之间的反馈。结果表明，河道中的沉积物浓度与洪水和高松弛水期间相邻海湾的波高直接相关，而退潮期间的浓度取决于局部河道速度。此外，退潮期间的泥沙通量与前一次洪水期间的泥沙通量处于相同的数量级，这表明在潮汐周期中只有一小部分被运送的泥沙被储存在沼泽中。最后，以高潮汐速度为特征的极低潮汐将大量沉积物排入海洋。

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