The effectiveness of beach mega-nourishment, assessed over three management epochs.

The effectiveness of beach mega-nourishment, assessed over three management epochs.
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海滩巨型营养的有效性,在三个管理时期进行了评估。

DOI:
10.1016/j.jenvman.2016.09.090
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发表时间:
2016
影响因子:
8.7
通讯作者:
Brown JM
Brown JM
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Brown JM

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有复原力的沿海保护需要适应性管理战略,这些战略要与自然结合,以保持长期的可持续性。随着城市化、工业增长、海平面上升和风暴气候变化对海岸线的压力越来越大,实施沿海管理的软方法,以支持自然栖息地并维持健康的沿海生态系统。一个海滩巨型营养沿着正面的互动自然和工程系统,包括软,硬防御的影响进行了探讨。应用海岸演变模型模拟不同假设的巨型营养干预措施的影响,以评估其在3个海岸线管理规划时期的影响:当前(0-20年),中期(20-50年)和长期(50-100年)。人们发现,如果定位得当,较小的干预措施的影响与较大的计划一样有效,从而使它们对于当今的管理来说更具成本效益。随着时间的推移,大型干预措施的好处变得更加明显,多地点计划需要较小的初始营养,以实现至少与单一地点计划相同的好处。虽然较大方案的长期影响减少了前沿的侵蚀,但方案的短期影响向下漂移可能导致侵蚀增加,因为自然沉积物漂移被中断。这项研究提出了一个可转移的建模工具,以评估各种沉积海岸线的营养计划的影响,并突出了海滩巨型营养的积极和消极影响。
Resilient coastal protection requires adaptive management strategies that build with nature to maintain long-term sustainability. With increasing pressures on shorelines from urbanisation, industrial growth, sea-level rise and changing storm climates soft approaches to coastal management are implemented to support natural habitats and maintain healthy coastal ecosystems. The impact of a beach mega-nourishment along a frontage of interactive natural and engineered systems that incorporate soft and hard defences is explored. A coastal evolution model is applied to simulate the impact of different hypothetical mega-nourishment interventions to assess their impacts’ over 3 shoreline management planning epochs: present-day (0–20 years), medium-term (20–50 years) and long-term (50–100 years). The impacts of the smaller interventions when appropriately positioned are found to be as effective as larger schemes, thus making them more cost-effective for present-day management. Over time the benefit from larger interventions becomes more noticeable, with multi-location schemes requiring a smaller initial nourishment to achieve at least the same benefit as that of a single-location scheme. While the longer-term impact of larger schemes reduces erosion across a frontage the short-term impact down drift of the scheme can lead to an increase in erosion as the natural sediment drift becomes interrupted. This research presents a transferable modelling tool to assess the impact of nourishment schemes for a variety of sedimentary shorelines and highlights both the positive and negative impact of beach mega-nourishment.
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