Physical model comparison of gray and green mitigation alternatives for flooding and wave force reduction in an idealized urban coastal environment
Physical model comparison of gray and green mitigation alternatives for flooding and wave force reduction in an idealized urban coastal environment
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DOI：
10.1016/j.coastaleng.2023.104339
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发表时间：
2023-06-03
影响因子：
4.4
通讯作者：
Lomonaco，Pedro
中科院分区：
文献类型：
--
作者：
Van Dang，Hai;Park，Hyoungsu;Lomonaco，Pedro
一个1：16比例的物理模型，调查海堤的有效性，一个淹没防波堤，和红树林，以减轻陆上洪水和部队的结构在一个理想化的城市沿海环境。该实验使用不同水位、波幅和时间尺度的海啸波来模拟长波动力学。分别对基线条件（无缓解）、海堤、潜堤和红树林进行了试验，并对海堤和潜堤进行了组合试验。波浪仪，声学多普勒测速仪，测压元件，和压力计被用来测量波的高度，速度，力，和沿海结构上的压力，分别。这些硬结构和红树林的性能进行了比较，通过它们对波的高程，粒子速度和力的减少。实验结果表明，每一个保护结构减少了水平波力和内陆流的水动力在低水位的情况下，与类似的性能由单独的海堤，潜堤，和四排红树林。当海堤和水下防波堤同时安装时，组合配置导致最大作用力减少约50%，而排列成八排的红树林导致第一个建筑阵列中的作用力减少46%。然而，在高水位的情况下，与潜堤的存在下测得的冲击力大于在基线情况下，因此，潜堤可能会放大冲击力的垂直建筑物行的某些入射波条件。一般来说，结合硬结构诱导的最低力折减系数测量几乎每一个建筑行相比，海堤，潜堤，红树林单独考虑所有的波浪条件和水位。这意味着这种多层结构在减少内陆水平力方面比单独考虑的单独替代方案表现出更好的性能。
A 1:16 scaled physical model was constructed to investigate the effectiveness of a seawall, a submerged breakwater, and mangrove forests to mitigate overland flooding and forces on structures in an idealized urban coastal environment. The experiment was performed using tsunami-like waves at different water levels, wave amplitudes, and time scales to simulate long-wave dynamics. The baseline condition (no mitigation), seawall, submerged breakwater, and mangrove forest were tested individually, and the seawall and submerged breakwater were also tested in combination. Wave gauges, acoustic Doppler velocimeters, loadcells, and pressure gauges were used to measure wave elevations, velocities, forces, and pressures on coastal structures, respectively. The performance of these hard structures and mangroves was compared through their effects on wave elevation, particle velocity, and force reduction. Experimental results showed that each protecting structure reduced the horizontal wave forces and inland flow hydrodynamics in the low-water-level case, with a similar performance by the individual seawall, submerged breakwater, and four rows of mangroves. The combined configuration, when the seawall and submerged breakwater were installed simultaneously, caused the most significant maximum force percent reduction by approximately 50%, while mangrove forests arranged in eight rows resulted in a force reduction of 46% in the first building array. However, in the high-water-level cases, the impulsive force measured with the presence of the submerged breakwater was larger than in the baseline case; thus, the submerged breakwater may amplify the impulsive force on the vertical building rows for certain incident wave conditions. Generally, the combined hard structures induced the lowest force reduction factor measured in almost every building row compared to the seawall, submerged breakwater, and mangroves considered separately for all wave conditions and water levels. That means this multi-tiered configuration showed better performance than individual alternatives in reducing horizontal forces inland than the individual alternatives considered separately.