Breakwaters used in living shoreline projects are referred to as engineered reefs and are used to modify wave characteristics along estuarine shorelines in such a way as to promote ecological and biological enhancement, with stabilization of the shoreline often an expressed goal. Studies show engineered reefs are a successful alternative to traditional rubble mound breakwaters in the environmental aspect; however, the true success of these structures has not been quantified in terms of wave energy dissipation. Through physical modeling of engineered reefs using the University of South Alabama's wave basin, much of the engineering design related to wave energy was determined. The testing included bagged oyster shell breakwaters, apex-truncated square concrete pyramids, and ReefBLKs SM subjected to multiple wave forms and water depths. Results from the testing showed that wave transmission through bagged oyster shell and concrete pyramid devices can mostly be explained using published methodologies. In terms of structure geometry, the non-dimensional height, h c/d, is the primary factor when designing the engineered reefs. The bagged oyster shell and ReefBLKsSM are more effective in attenuating shorter wavelengths while concrete pyramids are more effective in attenuating longer wavelengths. The dependence of structure performance on wave period is a new finding.
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机译:在生活中的海岸线项目中使用的防波堤被称为工程礁,并被用来修改沿河口海岸线的波浪特征,以促进生态和生物的增强,而海岸线的稳定往往是一个明确的目标。研究表明,在环境方面,人造礁石是传统瓦砾防波堤的成功替代品。然而,这些结构的真正成功还没有在波能消散方面进行量化。通过使用南阿拉巴马大学的波浪盆地对工程礁进行物理建模,确定了与波浪能有关的许多工程设计。测试包括袋装牡蛎壳防波堤,顶角截断的方形混凝土金字塔和经受多种波形和水深的ReefBLKs SM。测试结果表明,通过袋装牡蛎壳和混凝土金字塔形设备传播的波主要可以使用已公开的方法进行解释。就结构的几何形状而言,无尺寸的高度h c / d是设计工程礁时的主要因素。套袋的牡蛎壳和ReefBLKsSM在衰减较短波长方面更有效,而混凝土金字塔在衰减较长波长方面更有效。结构性能对波浪周期的依赖性是一个新发现。
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