| 潮流及单向流作用下海底沙波形成和运移试验 |
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| 引用本文： | 王 琮,孙永福,刘振纹,周其坤,孙玉欣.潮流及单向流作用下海底沙波形成和运移试验[J].海洋科学进展,2020,38(4):688-696. |
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| 作者姓名： | 王 琮 孙永福 刘振纹 周其坤 孙玉欣 |
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| 作者单位： | 自然资源部 第一海洋研究所,山东 青岛 266061;中国石油集团 工程技术研究有限公司,天津 300451,自然资源部 第一海洋研究所,山东 青岛 266061,中国石油集团 工程技术研究有限公司,天津 300451,天津大学 建筑工程学院,天津 300350 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项资金资助项目——海底沙波形成机理及对管线影响研究(2017Q04);
国家自然科学基金项目——南海北部外陆架海底沙波迁移特征及其动力机制研究(41806079);
青岛市博士后应用研究项目 |
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| 摘 要： | 基于量纲分析理论进行水槽试验,研究了潮流以及单向流作用下海底沙波的形成和发展过程。通过分析
海床地形数据,对海底沙波的特征尺度和发展过程进行定量描述,得出了潮流流速、周期、水深以及叠加单向流等因素对沙波特征尺度的影响。结果表明,潮流作用产生的海底地貌由大尺度的沙波和小尺度的沙纹共同组成,大尺度沙波在地貌形态塑造中占主导地位。从平坦海床开始,沙波波高和波长随水流作用逐渐增大,增长速度越来越慢,最终达到动态平衡。沙波特征波高和特征波长随流速和水深增大而增大,同时随往复流周期的增大而增大,并不断趋近于单向水流的情况。进一步对小尺度的沙纹地貌进行分析,得出了沙纹特征尺度随水流条件的变化规律。
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| 关 键 词： | 海底沙波 潮流 发展过程 特征尺度 |
Experiment on Formation and Migration of Submarine Sandwaves Under Current Conditions |
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| WANG Cong,SUN Yong-fu,LIU Zhen-wen,ZHOU Qi-kun,SUN Yu-xin.Experiment on Formation and Migration of Submarine Sandwaves Under Current Conditions[J].Advances in Marine Science,2020,38(4):688-696. |
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| Authors: | WANG Cong SUN Yong-fu LIU Zhen-wen ZHOU Qi-kun SUN Yu-xin |
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| Institution: | 1. First Institute of Oceanography, MNR, Qingdao 266061, China;
2.CNPC Engineering Technology Research Company Limited, Tianjin 300451, China;
3.School of Civil Engineering, Tianjin University, Tianjin 300350, China |
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| Abstract: | Submarine sand waves have important influences on the construction and safety operation of ocean engineering. The tidal current is one of the main causes for formation of submarine sand waves. Based on the dimensional analysis, this study conducted the flume experiments to study the formation and development of submarine sand waves under the tidal current and unidirectional flows. By analyzing the seabed morphology data, this study quantitatively described the characteristic scale and evolution process, and discussed the effects of the speed and cycling period of the tidal current, the water depth and the combination of tidal current and unidirectional flow on the characteristic geometry of sand waves. The experiment results showed that the seabed topography produced by the tidal current is composed of large-scale sand waves and small-scale sand ripples, in which the former topography is dominant to shape the form of the seabed. Beginning from a flat seabed, the height and length of sand waves gradually increase and the growth rate decreases under the action of currents, and it reaches a dynamic balance finally. Both the characteristic wave height and characteristic wavelength of sand waves increase with the increase of flow velocity and water depth. They also increase with the increasing reciprocating flow period, finally tend to close to the condition of unidirectional flows. Furthermore, this study analyzed the topography of the small-scale sand ripples, and indicated the rule of characteristic scale of sand ripples under different currents. |
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| Keywords: | submarine sand wave current development process characteristic scale |
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