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刚性植物分布方式对海啸波消减影响实验研究
彭浩1, 陈杰1,2,3,4, 蒋昌波1,2,3,4, 何飞1, 邓斌1,2,3,4, 屈科1,2,3,4, 隆院男1,2,3,4, 伍志元1,4
1.长沙理工大学水利工程学院 长沙 410114;2.洞庭湖水环境治理与生态修复湖南省重点实验室 长沙 410114;3.水沙科学与水灾害防治湖南省重点实验室 长沙 410114;4.湖南省环境保护河湖污染控制工程技术中心 长沙 410114
摘要:
在理论分析的基础上通过物理模型实验探究了刚性植物分布方式对海啸波消减的影响。实验中借助孤立波模拟海啸波,分析了矩形、交错、组合三类分布方式下孤立波沿程波高、透射系数以及拖曳力系数的变化情况。结果表明,植物分布密度相等时,孤立波在矩形和组合分布植物模型前的壅高均大于交错分布植物模型。同时,植物分布密度一定时,分布方式将对植物消波产生影响,且植物间横向间距L2比纵向间距L1的影响更大。在雷诺数2000≤Rep≤4000且体积分数小于或等于0.331的条件下,各植物模型的拖曳力系数随植物分布密度的增大而增大。
关键词:  孤立波  刚性植物  分布方式  波浪衰减  透射系数  拖曳力系数  淹没度
DOI:10.11693/hyhz20171200303
分类号:P731.22
基金项目:国家自然科学基金重点项目,51839002号;湖南省自然科学基金项目,2018JJ3546号;长沙理工大学研究生科研创新项目,CX2017SS10号。
EXPERIMENTAL INVESTIGATION ON TSUNAMI WAVE ATTENUATION UNDER THE EFFECT OF RIGID VEGETATION DISTRIBUTION
PENG Hao1, CHEN Jie1,2,3,4, JIANG Chang-Bo1,2,3,4, HE Fei1, DENG Bin1,2,3,4, QU Ke1,2,3,4, LONG Yuan-Nan1,2,3,4, WU Zhi-Yuan1,4
1.School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;2.Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China;3.Key Laboratory of Water Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;4.Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha 410114, China
Abstract:
We studied in a flume experiment the effects of rigid vegetation distribution on tsunami wave attenuation based on theoretical analysis in which solidary waves were used to represent tsunami waves. The variations of wave height, transmission coefficient, and the drag coefficient in rectangle and staggered patterns or the combined pattern were analyzed. Results show that under a given vegetation density, the wave run-up in front of the vegetation model in the rectangle and combined patterns is higher than that of staggered pattern. Moreover, under a given vegetation density, the wave attenuation in transversal space of adjacent plants (L2) is greater than that in lengthwise spaces of adjacent plants (L1). Under the condition of 2000 ≤ Rep ≤ 4000 (Rep:the Reynolds number in porewater velocity in vegetation region) and the volume fraction is less than 0.331, the drag coefficient of different vegetation patterns increases when the fraction increases. Therefore, findings of this paper could provide a theoretical basis for the protection against tsunami by coastal plantation.
Key words:  solitary wave  rigid vegetation  distribution  wave height attenuation  transmission coefficient  drag coefficient  submergence ratio
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