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Flows over crescentic bars under control of wave energy
Geo-Marine Letters ( IF 2.1 ) Pub Date : 2019-11-28 , DOI: 10.1007/s00367-019-00621-y
Hee Jun Lee , Mujong Kim , Jong Dae Do , Hak Soo Lim , Chung Kyun Jeon

Crescentic bars with wavelengths of 250–450 m were observed on a micro-tidal, open coast (Anmok Beach, Korea) to unravel the flow patterns over them under various wave conditions. The horn and bay environments of the crescents were distinguished to measure respective near-bottom flow conditions in the nearshore 3–8 m deep. Offshore waves were measured at a station about 18 m deep. The measurement duration spanned approximately one winter month and two stormy spells of several days each in summer and another winter comprising three different field campaigns. In addition, bar morphologies were measured with single- and multi-beam echo-sounders before and after each hydrodynamic measurement. Winter-storm waves yielded discernable bar movements offshore accompanied by a merging of small bays into a larger one. During the field campaigns, the bars moved alongshore by far less than a half of their wavelength. Hydrodynamic measurements show a suite of the flow patterns including onshore and offshore uniform flows and rip cell circulations. The flow patterns depend exclusively on the offshore significant wave height ( H s ), or a non-dimensional parameter H p = H s tan θ / h c $$ {\mathrm{H}}_{\mathrm{p}}={H}_s\sqrt{\tan \theta }/{h}_c $$ , where h c is the water depth of the bar crest and tan θ the slope gradient. Therefore, the specific ranges of H p could be given to individual flow patterns measured. These results are used to illustrate a coupled behavior of the bars and flows in a beach-state cycle forced by varying wave energies.

中文翻译:

在波浪能的控制下流过新月棒

在微潮的开阔海岸(韩国安木海滩)上观察到波长为 250-450 m 的新月形棒,以揭示在各种波浪条件下它们上的流动模式。区分了新月形的角和海湾环境,以测量近岸 3-8 m 深的近底流条件。在大约 18 m 深的台站测量了海上波浪。测量持续时间跨越大约一个冬季月份和两次风暴期,夏季各几天,另一个冬季包括三个不同的野外活动。此外,在每次流体动力学测量之前和之后,使用单波束和多波束测深仪测量棒形貌。冬季风暴波在近海产生了可辨别的酒吧运动,伴随着小海湾合并成一个更大的海湾。在野外活动期间,条形沿海岸移动的距离远不到其波长的一半。水动力测量显示了一套流动模式,包括陆上和海上均匀流动和裂隙单元循环。流动模式完全取决于海上有效波高 ( H s ),或无量纲参数 H p = H s tan θ / hc $$ {\mathrm{H}}_{\mathrm{p}}={ H}_s\sqrt{\tan \theta }/{h}_c $$ ,其中 hc 是杆顶的水深,tan θ 是坡度。因此,H p 的特定范围可用于测量的各个流型。这些结果用于说明由变化的波浪能量强制的海滩状态循环中的杆和流的耦合行为。水动力测量显示了一套流动模式,包括陆上和海上均匀流动和裂隙单元循环。流动模式完全取决于海上有效波高 ( H s ),或无量纲参数 H p = H s tan θ / hc $$ {\mathrm{H}}_{\mathrm{p}}={ H}_s\sqrt{\tan \theta }/{h}_c $$ ,其中 hc 是杆顶的水深,tan θ 是坡度。因此,H p 的特定范围可用于测量的各个流型。这些结果用于说明由变化的波浪能量强制的海滩状态循环中的杆和流的耦合行为。水动力测量显示了一套流动模式,包括陆上和海上均匀流动和裂隙单元循环。流动模式完全取决于海上有效波高 ( H s ),或无量纲参数 H p = H s tan θ / hc $$ {\mathrm{H}}_{\mathrm{p}}={ H}_s\sqrt{\tan \theta }/{h}_c $$ ,其中 hc 是杆顶的水深,tan θ 是坡度。因此,H p 的特定范围可用于测量的各个流型。这些结果用于说明由变化的波浪能量强制的海滩状态循环中的杆和流的耦合行为。或一个无量纲参数 H p = H s tan θ / hc $$ {\mathrm{H}}_{\mathrm{p}}={H}_s\sqrt{\tan \theta }/{h}_c $$ ,其中 hc 是杆顶的水深,tan θ 是坡度。因此,H p 的特定范围可用于测量的各个流型。这些结果用于说明由变化的波浪能量强制的海滩状态循环中的杆和流的耦合行为。或一个无量纲参数 H p = H s tan θ / hc $$ {\mathrm{H}}_{\mathrm{p}}={H}_s\sqrt{\tan \theta }/{h}_c $$ ,其中 hc 是杆顶的水深,tan θ 是坡度。因此,H p 的特定范围可用于测量的各个流型。这些结果用于说明由变化的波浪能量强制的海滩状态循环中的杆和流的耦合行为。
更新日期:2019-11-28
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