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An integrated physical and cost-benefit approach to assess groins as a coastal erosion mitigation strategy
Coastal Engineering ( IF 4.4 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.coastaleng.2019.103614
M. Lima , C. Coelho , F. Veloso-Gomes , P. Roebeling

Abstract Future investments required for the construction and maintenance of coastal defense interventions are expected to increase, due to increasing coastal erosion issues along social, environmental and economically valuable coastal areas. The high costs related with coastal defense interventions require improved knowledge on their performance, considering impacts, costs and benefits. Despite the existence of several cost-benefit approaches applied to coastal zones, in this study a well-defined, sequential and integrated methodology supported by already existent numerical models is developed and applied to assess the effectiveness (shoreline evolution impacts), costs and benefits of different coastal defense interventions. This methodology encompasses three integrated modules, including a shoreline evolution module (to estimate areas of territory maintained, gained or lost over time), a coastal structure pre-design module (to estimate material volumes of coastal works) and a cost-benefit evaluation module (to assess cost-benefit evaluation criteria). The approach allows for the physical and economic comparison of different coastal defense intervention scenarios, helping coastal management and planning entities to define strategies. In this study, the proposed methodology was applied to evaluate the performance of different groin scenarios, based on a hypothetical case study. The case study allowed highlighting the importance of the physical and economic analysis of different scenarios. Results show that the definition of coastal defense interventions is complex where, on the one hand, best physical solutions are sometimes related to very high costs and, on the other hand, best economic scenarios lead to high territory losses. Thus, the innovative approach presented in this study shows that an integrated analysis of shoreline evolution, coastal intervention design and subsequent costs and benefits allows to improve the physical and economic performances of coastal defense interventions.

中文翻译:

评估腹股沟作为海岸侵蚀缓解策略的综合物理和成本效益方法

摘要 由于社会、环境和经济价值较高的沿海地区的海岸侵蚀问题日益严重,预计未来建设和维护海防干预所需的投资将会增加。与海防干预相关的高成本需要提高对其绩效的了解,并考虑影响、成本和收益。尽管存在几种适用于沿海地区的成本效益方法,但在本研究中,开发了一种由现有数值模型支持的明确、连续和综合的方法,以评估其有效性(海岸线演变影响)、成本和收益。不同的海防干预措施。这种方法包括三个集成模块,包括海岸线演变模块(估计随着时间的推移保持、获得或失去的领土面积)、沿海结构预设计模块(估计沿海工程的材料量)和成本效益评估模块(评估成本效益评估)标准)。该方法允许对不同的海防干预方案进行物理和经济比较,帮助沿海管理和规划实体定义策略。在这项研究中,基于假设的案例研究,所提出的方法被应用于评估不同腹股沟场景的性能。案例研究强调了对不同情景进行物理和经济分析的重要性。结果表明,海防干预的定义很复杂,一方面,最佳的物理解决方案有时与非常高的成本有关,而另一方面,最佳的经济方案会导致高额的领土损失。因此,本研究中提出的创新方法表明,对海岸线演变、海岸干预设计以及后续成本和收益的综合分析可以提高海岸防御干预的物理和经济性能。
更新日期:2020-03-01
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