This paper presents a well-controlled laboratory experimental study to evaluate wave attenuation by artifi- cial emergent plants (Phragmites australis) under different wave conditions and plant stem densities. Results showed substantial wave damping under investigated regular and irregular wave conditions and also the different rates of wave height and within canopy wave-induced flows as they travelled through the vegetated field under all tested conditions. The wave height decreased by 6%–25% at the insertion of the vegetation field and towards the downstream at a mean of 0.2 cm and 0.32 cm for regular and irregular waves respectively. The significant wave height along the vegetation field ranged from 0.89–1.76 cm and 0.8–1.28 cm with time mean height of 1.38 cm and 1.11 cm respectively for regu- lar and irregular waves. This patterns as affected by plant density and also location from the leading edge of vegetation is investigated in the study. The wave energy attenuated by plant induced friction was predicted in terms of energy dissipation factor (fe) by Nielsen's (1992) empirical model. Shear stress as a driving force of particle resuspension and the implication of the wave attenuation on near shore protection from erosion and sedimentation was discussed. The results and findings in this study will advance our understanding of wave attenuation by an emergent vegetation of Phragmites australis, in water system engineering like near shore and bank protection and restoration projects and also be employed for management purposes to reduce resuspension and erosion in shallow lakes.

本文提出了一个控制良好的实验室实验研究，以评估人工新兴植物（芦苇）的波衰减。）在不同的波浪条件和植物茎密度下。结果显示，在所研究的规则和不规则波浪条件下，波浪具有显着的阻尼作用；在所有测试条件下，波高和冠层波浪引起的水流在穿过植被场时的速率也不同。插入植被场时，波高下降了6％–25％，规则波和不规则波的波高分别下降0.2 cm和0.32 cm。沿规则波场和不规则波，沿植被场的重要波高分别为0.89-1.76 cm和0.8-1.28 cm，时间平均高度分别为1.38 cm和1.11 cm。在这项研究中，研究了这种模式受植物密度以及从植被前沿开始的位置的影响。Nielsen（1992）的经验模型根据能量耗散因子（fe）预测了由植物引起的摩擦所衰减的波能。讨论了作为颗粒重悬驱动力的剪切应力，以及波浪衰减对近岸侵蚀和沉降保护的意义。这项研究的结果和发现将促进我​​们对芦苇的新兴植被在水系统工程（如近岸和岸边保护与修复项目）中对波衰减的理解，也可用于管理目的以减少浅水湖泊的重悬和侵蚀。讨论了作为颗粒重悬驱动力的剪切应力，以及波浪衰减对近岸侵蚀和沉积保护的影响。这项研究的结果和发现将促进我​​们对芦苇的新兴植被在水系统工程（如近岸和岸边保护与修复项目）中对波衰减的理解，也可用于管理目的以减少浅水湖泊的重悬和侵蚀。讨论了作为颗粒重悬驱动力的剪切应力，以及波浪衰减对近岸侵蚀和沉降保护的意义。这项研究的结果和发现将促进我​​们对芦苇的新兴植被在水系统工程（如近岸和岸边保护与恢复项目）中对波衰减的理解，也可用于管理目的以减少浅水湖泊的重悬和侵蚀。