Numerical modeling of three‐dimensional stratified tidal flow over Camarinal Sill, Strait of Gibraltar
Numerical modeling of three‐dimensional stratified tidal flow over Camarinal Sill, Strait of Gibraltar
复制标题
直布罗陀海峡Camarinal Sill上空三维分层潮汐流的数值模拟
DOI：
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
L. Pratt
中科院分区：
文献类型：
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作者：
J. Sánchez;G. Sannino;L. Liberti;J. G. Lafuente;L. Pratt
[1]本文用一个三维、完全非线性、非静力数值模式研究了直布罗陀内Camarinal Sill地区斜压对正压潮汐强迫的响应。数值计算的目的是评估三维效应，这是潜在的显着的，因为在该地区相当不规则的底部地形，可变的背景分层，和复杂的结构的正压潮汐。模型结果揭示了一个复杂的斜压响应下相对温和的洪水潮流，其中包括形成的内部水跃上游的窗台，内部交叉波接近渠道壁，和一个暴跌的密度跃层在背风侧的窗台波峰。这些结构表现出显著的跨通道空间依赖性，并且可能看起来跨通道对齐在一起。这一事实使得它们很难从遥感图像捕获的表面图案中识别出来。在较强的正压强迫（大潮）下，上游水跃移到Camarinal Sill的背风侧，形成单一的内部水跃。显著的第一和第二模式的水力跃变也产生在丹吉尔盆地较小的二次窗台附近，从而扩展发生强烈的水混合和能量耗散的海峡的其他区域。
[1] The baroclinic response to barotropic tidal forcing in the Camarinal Sill area, within the Strait of Gibraltar, is investigated with a three-dimensional, fully nonlinear, nonhydrostatic numerical model. The aim of numerical efforts was the assessment of three-dimensional effects, which are potentially significant in the area because of rather irregular bottom topography, variable background stratification, and complex structure of barotropic tides. Model results reveal a complex baroclinic response under relatively moderate flood tidal currents, which includes the formation of internal hydraulic jumps upstream of the sill, internal cross waves close to the channel walls, and a plunging pycnocline at the lee side of the sill crest. These structures exhibit significant cross-channel spatial dependence and may appear to be aligned together across the channel. This fact makes their identification difficult from the surface pattern captured by remote sensing images. Under strong barotropic forcing (spring tides) the upstream hydraulic jumps are shifted to the lee side of Camarinal Sill, where a single internal hydraulic jump is formed. Significant first- and second-mode hydraulic jumps are also generated near smaller secondary sills in Tangier basin, thus extending the occurrence of intense water mixing and energy dissipation to other zones of the strait.
直布罗陀海峡大振幅内波三维演化
影响因子：
3.5
作者：
Vlasenko V
通讯作者：
Vlasenko V