| 根、茎、叶定量概化植物模型沿程不规则波消减实验 |
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| 引用本文： | 陈杰,龚尚鹏,官志鑫,张竹,谢振东,雷佳欣,彭浩.根、茎、叶定量概化植物模型沿程不规则波消减实验[J].海洋学研究,2019,37(4):48-59. |
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| 作者姓名： | 陈杰 龚尚鹏 官志鑫 张竹 谢振东 雷佳欣 彭浩 |
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| 作者单位： | 南京水利科学研究院水利部水科学与水工程重点实验室,江苏南京210029;长沙理工大学水利工程学院,湖南长沙410114;长沙理工大学水利工程学院,湖南长沙410114;湖南省交通勘察设计院有限公司,湖南长沙410008;湖南水利水电职业技术学院建筑工程系,湖南长沙410131 |
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| 基金项目： | 国家自然科学基金重点项目资助(51839002);国家自然科学基金项目资助(51979014);湖南省教育厅科学研究项目重点项目资助(18A123);水利部水科学与水工程重点实验室开放研究基金项目资助(YK914013) |
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| 摘 要： | 在理论分析的基础上利用根、茎、叶均可量化的植物模型,开展波浪水槽实验。通过改变实验水深、入射波高、植物分布密度等因素,研究不规则波在植物群传播时沿程波高衰减特性,利用快速傅里叶变换对不规则波频谱变化情况进行分析。结果表明,各植物模型消波效果较好,但很少出现植物消波的边界效应,不规则波沿植物群的波高变化情况多数时与Mendez理论曲线不一致,植物群各部分的波能衰减情况并无固定的变化规律。此外,波能衰减集中在谱峰频率处,且入射波高越大,透射波与入射波之间的谱峰值差值越大,但透射波的频谱宽度与入射波相比无明显变化。本研究可为采用近岸植物消波护岸提供一定的理论依据。
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| 关 键 词： | 不规则波 植物 波高衰减 快速傅里叶变换 |
| 收稿时间： | 2019-06-03 |
Experimental investigation on irregular wave attenuation under the effects of vegetation with roots,stems and canopies |
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| CHEN Jie,GONG Shang-peng,GUAN Zhi-xin,ZHANG Zhu,XIE zhen-dong,LEI Jia-xin,PENG Hao.Experimental investigation on irregular wave attenuation under the effects of vegetation with roots,stems and canopies[J].Journal of Marine Sciences,2019,37(4):48-59. |
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| Authors: | CHEN Jie GONG Shang-peng GUAN Zhi-xin ZHANG Zhu XIE zhen-dong LEI Jia-xin PENG Hao |
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| Affiliation: | 1. Key Laboratory of Water Science and Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;2. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;3. Hunan Provincial Communications Planning, Survey & Design Institute Co. ,Ltd. , Changsha 410008, China;4. Department of Architectural Engineering, Hunan Technical College of Water Resources and Hydropower, Changsha 410131, China |
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| Abstract: | Based on the theoretical analysis, wave flume experiments were carried out employing vegetation models with quantifiable root, stem and canopy. The attenuation characteristics of irregular wave height within the vegetation filed was investigated by a combination of water depth, incident wave height and vegetation distribution density. Variation of wave spectra associated with vegetation was studied using FFT. The results show that the vegetation models in this experiment have good wave-absorbing effect, but the boundary effect of vegetation wave attenuation is rare. The variation of irregular wave height along the flora is inconsistent with Mendez's theoretical curve most of the time. At the same time, there is no fixed variation of wave energy loss within different sections of the vegetation filed. In addition, the attenuation of wave energy is concentrated at the peak frequency, and increasing incident wave height result in a bigger difference between spectra values of transmitted wave and incident wave at peak frequency, while spectra of both transmitted wave and incident wave show similar bands. This study can provide a theoretical basis for using coastal vegetation to reduce shoreline erosion by surface waves. |
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| Keywords: | irregular wave vegetation wave height attenuation FFT |
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