Internal solitary waves(ISWs)are nonlinear fluctuations in nature that could cause significant interactions between seawater and the seabed.ISWs have been proven to be an adequate cause of sediment resuspension in sha...Internal solitary waves(ISWs)are nonlinear fluctuations in nature that could cause significant interactions between seawater and the seabed.ISWs have been proven to be an adequate cause of sediment resuspension in shallow and deep-sea environments.In the South China Sea,ISWs have the largest amplitude globally and directly interact with the seabed near the Dongsha slope in the northern South China Sea.We analyzed the water profile and high-resolution multibeam bathymetric data near the Dongsha slope and revealed that submarine trenches have a significant impact on the sediment resuspension by ISWs.Moreover,ISWs in the zone of the wave-wave interaction enhanced sediment mixing and resuspension.The concentration of the suspended particulate matter inside submarine trenches was significantly higher than that outside them.The concentration of the suspended particulate matter near the bottoms of trenches could be double that outside them and formed a vast bottom nepheloid layer.Trenches could increase the concentration of the suspended particulate matter in the entire water column,and a water column with a high concentration of the suspended particulate matter was formed above the trench.ISWs in the wave-wave interaction zone near Dongsha could induce twice the concentration of the bottom nepheloid layer than those in other areas.The sediment resuspension caused by ISWs is a widespread occurrence all around the world.The findings of this study can offer new insights into the influence of submarine trench and wave-wave interaction on sediment resuspension and help in geohazard assessment.展开更多
波浪能作为一种可再生海洋清洁能源,其开发利用对建设绿色港口具有重要意义。将振荡水柱式(oscillating water column,简称OWC)发电装置与码头结构相结合,提出了一种兼做防波堤的集成OWC波浪发电装置的圆沉箱与吸力桶整体预制式离岸深...波浪能作为一种可再生海洋清洁能源,其开发利用对建设绿色港口具有重要意义。将振荡水柱式(oscillating water column,简称OWC)发电装置与码头结构相结合,提出了一种兼做防波堤的集成OWC波浪发电装置的圆沉箱与吸力桶整体预制式离岸深水码头结构,这种新结构具有整体刚度大、耐久性好、施工作业时间短和可适用于软土地基的优点。使用水动力软件FLOW-3D建立新型结构的三维水动力模型,系统研究了不同前墙入水深度、透平开孔率及入射波高时新型结构在波浪作用下的水动力特性,并计算了其波能转化效率。结果表明,新型结构的波能转化效率随入射波高增大而增大,随透平开孔率及前墙入水深度的增加呈现出先增后减的趋势,在前墙入水深度取7.5 m,透平开孔率取6%时,波能转化效率最大可达49.04%。同时,本研究提出的新型离岸深水码头结构上所受的波浪力相比未开孔结构大幅降低,实现提高码头安全度和利用绿色能源的双收益。建议在实际工程设计中适当提高气室开孔的高程或设置防护措施,以保证波能转换装置免受极端波浪的影响。展开更多
研究旨在探究振荡水柱(oscillating water column,简称OWC)防波堤前墙的受力特性。通过物理模型试验,利用狭缝开口模拟冲击式空气透平,测量前墙两侧的波浪压强和振荡水柱气室内气体压强,从而在计算前墙水平波致总力时计及波压力和气压...研究旨在探究振荡水柱(oscillating water column,简称OWC)防波堤前墙的受力特性。通过物理模型试验,利用狭缝开口模拟冲击式空气透平,测量前墙两侧的波浪压强和振荡水柱气室内气体压强,从而在计算前墙水平波致总力时计及波压力和气压力。研究结果表明,气室宽度比和狭缝开口率是影响波浪压强和气体压强的关键参数,其主要影响表现为:改变前墙两侧波浪压强的幅值,改变前墙两侧高波压区域的垂向宽度以及改变气压振荡的剧烈程度。在不同的气室结构参数和波浪参数组合下,前墙的最大水平波致力分布呈现两个高波力区域,时域分析结果表明,这两个区域的前墙水平波致力中波压分力与气压分力的峰值幅值和相位组合存在差异。文中特别强调气体压强在前墙水平波致力中的重要作用,受其主要影响,狭缝开口率小于1.50%的OWC防波堤前墙在B/L=0.15附近波浪作用下出现较大波致力。为确保OWC防波堤结构安全,设计时应根据海域波浪特征调整气室结构,避免或减少在前墙表面形成高波力区域。展开更多
基金supported by the National Natural Science Foundation of China(Nos.42107158 and 41831280)the Natural Science Foundation of Jiangsu Province(No.BK20210527)+2 种基金the Open Research Fund of Key Laboratory of Coastal Science and Integrated Management,the Ministry of Natural Resources,the National Basic Research Program of China(No.2018YFC0309200)the Fundamental Research Funds for the Central Universities(No.2021QN1096)We thank the Natural Science Foundation of China for the Open Research Cruise(No.NORC2018-05).
文摘Internal solitary waves(ISWs)are nonlinear fluctuations in nature that could cause significant interactions between seawater and the seabed.ISWs have been proven to be an adequate cause of sediment resuspension in shallow and deep-sea environments.In the South China Sea,ISWs have the largest amplitude globally and directly interact with the seabed near the Dongsha slope in the northern South China Sea.We analyzed the water profile and high-resolution multibeam bathymetric data near the Dongsha slope and revealed that submarine trenches have a significant impact on the sediment resuspension by ISWs.Moreover,ISWs in the zone of the wave-wave interaction enhanced sediment mixing and resuspension.The concentration of the suspended particulate matter inside submarine trenches was significantly higher than that outside them.The concentration of the suspended particulate matter near the bottoms of trenches could be double that outside them and formed a vast bottom nepheloid layer.Trenches could increase the concentration of the suspended particulate matter in the entire water column,and a water column with a high concentration of the suspended particulate matter was formed above the trench.ISWs in the wave-wave interaction zone near Dongsha could induce twice the concentration of the bottom nepheloid layer than those in other areas.The sediment resuspension caused by ISWs is a widespread occurrence all around the world.The findings of this study can offer new insights into the influence of submarine trench and wave-wave interaction on sediment resuspension and help in geohazard assessment.
文摘波浪能作为一种可再生海洋清洁能源,其开发利用对建设绿色港口具有重要意义。将振荡水柱式(oscillating water column,简称OWC)发电装置与码头结构相结合,提出了一种兼做防波堤的集成OWC波浪发电装置的圆沉箱与吸力桶整体预制式离岸深水码头结构,这种新结构具有整体刚度大、耐久性好、施工作业时间短和可适用于软土地基的优点。使用水动力软件FLOW-3D建立新型结构的三维水动力模型,系统研究了不同前墙入水深度、透平开孔率及入射波高时新型结构在波浪作用下的水动力特性,并计算了其波能转化效率。结果表明,新型结构的波能转化效率随入射波高增大而增大,随透平开孔率及前墙入水深度的增加呈现出先增后减的趋势,在前墙入水深度取7.5 m,透平开孔率取6%时,波能转化效率最大可达49.04%。同时,本研究提出的新型离岸深水码头结构上所受的波浪力相比未开孔结构大幅降低,实现提高码头安全度和利用绿色能源的双收益。建议在实际工程设计中适当提高气室开孔的高程或设置防护措施,以保证波能转换装置免受极端波浪的影响。
文摘研究旨在探究振荡水柱(oscillating water column,简称OWC)防波堤前墙的受力特性。通过物理模型试验,利用狭缝开口模拟冲击式空气透平,测量前墙两侧的波浪压强和振荡水柱气室内气体压强,从而在计算前墙水平波致总力时计及波压力和气压力。研究结果表明,气室宽度比和狭缝开口率是影响波浪压强和气体压强的关键参数,其主要影响表现为:改变前墙两侧波浪压强的幅值,改变前墙两侧高波压区域的垂向宽度以及改变气压振荡的剧烈程度。在不同的气室结构参数和波浪参数组合下,前墙的最大水平波致力分布呈现两个高波力区域,时域分析结果表明,这两个区域的前墙水平波致力中波压分力与气压分力的峰值幅值和相位组合存在差异。文中特别强调气体压强在前墙水平波致力中的重要作用,受其主要影响,狭缝开口率小于1.50%的OWC防波堤前墙在B/L=0.15附近波浪作用下出现较大波致力。为确保OWC防波堤结构安全,设计时应根据海域波浪特征调整气室结构,避免或减少在前墙表面形成高波力区域。
