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首页> 外文期刊>Ocean & coastal management >Delivering sustainable coasts: Monitoring the long-term stability of a breached barrier beach, Porlock Bay, Somerset, United Kingdom
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Delivering sustainable coasts: Monitoring the long-term stability of a breached barrier beach, Porlock Bay, Somerset, United Kingdom

机译：提供可持续的海岸：英国萨默塞特郡波洛克湾，监测破坏的屏障海滩的长期稳定性

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In many parts of the world, coastal managers have been compelled to make tough decisions about resource allocation, coastal protection and habitat restoration. The creation of habitats through managed realignment initiatives are essential tools for coastal zone managers. Porlock beach is an early example of managed realignment following the decision in the early 1990s to allow natural breaching without repair. Monitoring of these events is essential in understanding geomorphological evolution, but also to reassure the public and inform coastal managers in relation to the long-term stability of the barrier features. The planimetric beach change and inlet development at Porlock beach has been analysed from 1999 to 2014. The study utilised aerial photography and LiDAR datasets to ascertain shoreline positions and barrier width measurements throughout this period and calculate rates of change using linear regression. The results suggest that after some initial significant change, the beach itself and the breached inlet has generally stabilised. The increase in barrier width observed across all datasets is not reflected in the first sample period, spanning 1999 to 2006, which can be correlated with previous findings in the locality. Seaward barrier boundary advancement and landward boundary recession correlate to increased beach width observations, and can be attributed to redistribution and flattening of the barrier following barrier roll-over and breaching. Overall, this research suggests that the barrier beach at Porlock, whilst still exhibiting feature dynamism across shorter time-scales, is indicating relative geomorphological stability in the longer term which is considered important for coastal management.
机译：在世界许多地方，沿海管理者被迫做出关于资源分配，沿海保护和栖息地恢复的艰难决定。通过有管理的调整计划创造栖息地是沿海地区管理者的重要工具。在1990年代初决定允许自然破坏而无须维修之后，波洛克海滩便是管理调整的早期例子。对这些事件的监视对于理解地貌演化至关重要，而且对于使公众放心并告知沿海管理者有关屏障特征的长期稳定性至关重要。从1999年到2014年，对波洛克海滩的平面海滩变化和入水口开发进行了分析。该研究利用航空摄影和LiDAR数据集来确定这段时间内的海岸线位置和障碍物宽度测量值，并使用线性回归计算变化率。结果表明，在进行了一些初步的重大更改后，海滩本身和破裂的入口通常已经稳定下来。跨所有数据集观察到的屏障宽度的增加并未反映在1999年至2006年的第一个样本时期中，这与当地的先前发现相关。向海屏障边界的前进和向内边界的衰退与增加的海滩宽度观测值有关，并且可以归因于屏障翻滚和破坏后屏障的重新分布和平坦化。总体而言，这项研究表明，波洛克的屏障海滩虽然在较短的时间范围内仍表现出动态特征，但从长远来看表明相对地貌稳定，这对于沿海管理很重要。

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