An experimental study on oscillatory characteristics of young mangroves behind a portable reef

IF 1.9 3区工程技术 Q3 ENGINEERING, CIVIL Coastal Engineering Journal Pub Date : 2022-12-28 DOI:10.1080/21664250.2022.2161124

Sindhu Sreeranga, H. Takagi, Shin-ichi Kubota, J. Mitsui

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引用次数: 2

Abstract

ABSTRACT Approximately half of the world’s mangroves are concentrated in Asia, but they have been logged at an alarming rate. To compensate for this, mangrove plantations are being attempted at various sites but with many failures. In this study, we investigated the role of a small portable reef in protecting young mangrove plants from hydrodynamic disturbances caused by short-period waves. To investigate the effectiveness of such a small reef, an experiment using a large wave flume was conducted with two types of real-sized portable reefs (stone and block reefs). A numerical wave model was also constructed to analyze in detail the turbulence around the reef. Our previous study showed that short-period waves can cause resonant oscillations in young mangrove plants. To confirm whether this occurs even behind a reef system, a young mangrove model made of flexible olefin resin was tested with a small wave flume placed behind porous and non-porous reefs, and its oscillation was precisely measured using a high-speed camera. These experiments yielded several new findings. If appropriately designed, small porous reefs can minimize oscillations with adverse effects and provide a favorable environment for the initial growth of mangroves at restoration sites.

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移动暗礁后小红树林振荡特性的实验研究

摘要世界上大约一半的红树林集中在亚洲，但它们的砍伐速度惊人。为了弥补这一点，正在不同地点尝试红树林种植，但多次失败。在这项研究中，我们调查了一个小型便携式珊瑚礁在保护年轻的红树林植物免受短周期波浪引起的水动力干扰方面的作用。为了研究这种小珊瑚礁的有效性，使用大型波浪水槽对两种实际尺寸的可移动珊瑚礁（石礁和块礁）进行了实验。还建立了波浪数值模型，详细分析了珊瑚礁周围的湍流。我们之前的研究表明，短周期的波浪会在年轻的红树林植物中引起共振振荡。为了确认这种情况是否发生在珊瑚礁系统后面，用放置在多孔和非多孔珊瑚礁后面的小型波浪水槽测试了一个由柔性烯烃树脂制成的年轻红树林模型，并使用高速相机精确测量了其振荡。这些实验产生了一些新发现。如果设计得当，小型多孔珊瑚礁可以最大限度地减少产生不利影响的振荡，并为红树林在恢复地点的初始生长提供有利的环境。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Coastal Engineering Journal 工程技术-工程：大洋

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

7.5 months

期刊介绍： Coastal Engineering Journal is a peer-reviewed medium for the publication of research achievements and engineering practices in the fields of coastal, harbor and offshore engineering. The CEJ editors welcome original papers and comprehensive reviews on waves and currents, sediment motion and morphodynamics, as well as on structures and facilities. Reports on conceptual developments and predictive methods of environmental processes are also published. Topics also include hard and soft technologies related to coastal zone development, shore protection, and prevention or mitigation of coastal disasters. The journal is intended to cover not only fundamental studies on analytical models, numerical computation and laboratory experiments, but also results of field measurements and case studies of real projects.