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Overtopping Metrics and Coastal Safety: A Case of Study from the Catalan Coast
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2020-07-24 , DOI: 10.3390/jmse8080556
Corrado Altomare , Xavi Gironella , Tomohiro Suzuki , Giacomo Viccione , Alessandra Saponieri

Design criteria for coastal defenses exposed to wave overtopping are usually assessed by mean overtopping discharges and maximum individual overtopping volumes. However, it is often difficult to give clear and precise limits of tolerable overtopping for all kinds of layouts. A few studies analyzed the relationship between wave overtopping flows and hazard levels for people on sea dikes, confirming that one single value of admissible mean discharge or individual overtopping volume is not a sufficient indicator of the hazard, but detailed characterization of flow velocities and depths is required. This work presents the results of an experimental campaign aiming at analyzing the validity of the safety limits and design criteria for overtopping discharge applied to an urbanized stretch of the Catalan coast, exposed to significant overtopping events every stormy season. The work compares different safety criteria for pedestrians. The results prove that the safety of pedestrians on a sea dike can be still guaranteed, even for overtopping volumes larger than 1,000 L/m. Sea storms characterized by deep-water wave height between 3.6 and 4.5 m lead to overtopping flow depth values larger than 1 m and flow velocities up to 20 m/s. However, pedestrian hazard is proved to be linked to the combination of overtopping flow velocity and flow depth rather than to single maximum values of one of these parameters. The use of stability curves to assess people’s stability under overtopping waves is therefore advised.

中文翻译:

超越指标和海岸安全:以加泰罗尼亚海岸为例

通常通过平均超车流量和最大个人超车量来评估遭受波浪超车的海岸防御的设计标准。但是,通常很难对各种布局给出明确且精确的可容许的覆盖极限。几项研究分析了海堤上波浪超顶流量与危险水平之间的关系,并证实了允许的平均排放量或单个超顶量的单个值不足以表明危险,但可以对流速和深度进行详细描述需要。这项工作提出了一项实验性活动的结果,旨在分析安全限制的有效性和加泰罗尼亚海岸城市化沿线的过顶泄水设计标准,每个暴风雨季节都会遭受重大的超车事件。这项工作比较了行人的不同安全标准。结果证明,即使超过1000 L / m的通行量,海上堤坝上行人的安全仍然可以得到保证。以深水波高度在3.6至4.5 m之间为特征的海暴导致超过1 m的超流深度值和高达20 m / s的流速。但是,行人危险被证明与超速流速和流速深度的组合有关,而不是与这些参数之一的单个最大值有关。因此,建议使用稳定性曲线来评估人们在倾覆浪潮下的稳定性。结果证明,即使超过1000 L / m的通行量,海上堤坝上行人的安全仍然可以得到保证。以深水波高度在3.6至4.5 m之间为特征的海暴导致超过1 m的超流深度值和高达20 m / s的流速。但是,行人危险被证明与超速流速和流速深度的组合有关,而不是与这些参数之一的单个最大值有关。因此,建议使用稳定性曲线来评估人们在倾覆浪潮下的稳定性。结果证明,即使超过1000 L / m的通行量,海上堤坝上行人的安全仍然可以得到保证。以深水波高度在3.6至4.5 m之间为特征的海暴导致超过1 m的超流深度值和高达20 m / s的流速。但是,行人危险被证明与超速和深度有关,而不是这些参数之一的最大值。因此,建议使用稳定性曲线来评估人们在倾覆浪潮下的稳定性。事实证明,行人危险与超速流速和深度有关,而不是这些参数之一的单个最大值。因此,建议使用稳定性曲线来评估人们在倾覆浪潮下的稳定性。事实证明,行人危险与超速流速和深度有关,而不是这些参数之一的单个最大值。因此,建议使用稳定性曲线来评估人们在倾覆浪潮下的稳定性。
更新日期:2020-07-24
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