摘要
通过物理模型实验研究岸礁礁冠宽度变化对礁坪上波浪增水的影响,实验采用概化的岸礁和梯形礁冠模型,在一系列规则波工况下分别测试5种不同宽度的礁冠以及无礁冠模型。实验结果表明:礁冠宽度越大,波浪破碎造成的能量衰减越剧烈;礁冠的存在使礁坪上的波浪增水增大,且礁冠宽度越大,增水值越大;增水随礁冠水深的增大而减小,并引入了一对无量纲参数合理地描述了入射波波要素对增水的影响;运用文献中基于能量守恒的理论模型进一步研究了礁冠宽度对增水的影响,并给出模型中的礁形参数与实测的礁冠相对宽度间的经验关系式;通过分析同一礁冠水深控制下,相对增水随着礁冠相对宽度的变化趋势,发现只有在礁冠充分宽的情况下礁冠水深才是控制礁坪上增水的主要因素。
To investigate the effect of reef-crest width on wave-induced set-up over the fringing reefs, a series of experiments are performed in a wave flume using an idealized trapezoidal reef-crest and fringing reef model. Experimental results are reported for five reef-crest widths together with the case without reef crest under regular wave conditions. Data analysis shows that larger energy dissipation around the reef crest occurs under a wider reef crest. The presence of reef crest enhances the wave set-up over the reef flat, and the wave set-up also increases with the increase of the crest width. Wave set- up decreases with the increase of reef-crest submergence, and two dimensionless parameters are introduced to reasonably describe the effect of wave factors on the wave set-up. A theoretical model based on the conservation of energy in the literature is then used to further examine the effect of reef crest width, and an empirical formula describing the relationship between the shape factor in the model and relative width of crest is proposed. Finally, the variation of relative wave set-up with relative width of crest under the same reef-crest submergence is analyzed, and the results indicate that reef-crest submergence is the primary control factor of wave set-up over the reef flat only if the width of reef crest is sufficient.
出处
《海洋通报》
CAS
CSCD
北大核心
2017年第3期340-347,共8页
Marine Science Bulletin
基金
国家自然科学基金(51309035
51239001)
高等学校博士学科点科研基金新教师类(20134316120004)
大连理工大学海岸和近海工程国家重点实验室开放课题基金(LP1510)
长沙理工大学研究生科研项目(CX2015SS07)
关键词
礁冠宽度
波浪破碎
波浪增水
物理模型实验
reef-crest width
wave breaking
wave-induced set-up
laboratory experiments
