A new perspective on meso-scale shoreline dynamics through data-driven analysis

A new perspective on meso-scale shoreline dynamics through data-driven analysis
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通过数据驱动分析研究中尺度海岸线动力学的新视角

DOI:
10.1016/j.geomorph.2019.04.033
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发表时间:
2019
期刊:
影响因子:
3.9
通讯作者:
Reeve D
Reeve D
中科院分区:
地球科学2区
文献类型:
--
作者:
Reeve D

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气候变化和沿海发展的双重范围提高了公众对海岸线管理的认识。同时,他们强调了我们对沉积物运输和形态动力学过程的理解在时间和空间尺度上的差距,这些尺度适合于海岸线管理目的。在这里,我们分析了22年来沿着英国东部萨福克海岸收集的一组特殊的海滩调查,该调查延伸了大约80 公里,以调查中尺度海岸线的变化。这些调查每半年沿着固定的样带进行,间隔约为1 公里,作为沿海当局协助海岸线管理规划的战略监测工作的一部分。计算了海滩体积、前岸坡度和岸线位置的变化,以研究时空变化。分析揭示了对潮汐和波浪的物理过程、人为干预和地质控制的一些不同反应。海防设施的存在和海滩反应之间既没有明确的关系,也没有有序的区域尺度的海岸线运动。海滩体积和位置的时间变化提供了一幅类似的复杂画面,在研究地点内,衰退、增生和稳定的行为都很明显。有证据表明,在某些地点存在准周期行为,并且在大约5年以上的时间尺度上变率有所减少。
The twin ambits of climate change and coastal development have raised public awareness of shoreline management. Simultaneously, they have highlighted a gap in our understanding of sediment transport and morphodynamic processes at time and space scales appropriate for shoreline management purposes. Here, we analyse an exceptional set of beach surveys gathered over a period of twenty-two years along the Suffolk coast, eastern UK, that extends over approximately 80 km to investigate the meso-scale shoreline variations. The surveys have been made biannually along fixed transects spaced at approximately 1 km intervals as part of a strategic monitoring exercise undertaken by the coastal authorities to assist in shoreline management planning. Changes in beach volume, foreshore slope and shoreline position have been computed to investigate both spatial and temporal changes. The analysis reveals some distinct responses to the physical processes of tides and waves, anthropogenic interventions and geological controls. Neither a clear relationship between the presence of sea defences and beach response nor an ordered regional-scale shoreline movement are evident. Temporal variations in beach volumes and position provide a similarly complex picture with recessionary, accretionary and stable behaviour all apparent within the study site. There is evidence of quasi-cyclic behaviour at some locations as well as a reduction in variability over time-scales beyond approximately five years.
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