TY - JOUR
T1 - A Model Study on the Generation of Internal Tides by Tidal Flows Over a Submerged Seamount in the Channel
AU - Shuqun Cai, Junliang Liu & Xiaomin Long
JO - Communications in Computational Physics
VL - 1
SP - 95
EP - 114
PY - 2010
DA - 2010/08
SN - 8
DO - http://doi.org/10.4208/cicp.2009.09.069
UR - https://global-sci.org/intro/article_detail/cicp/7564.html
KW - 
AB - <p style="text-align: justify;">It is known that the submerged seamount/ridge is a source for the generation
of internal tides. In this paper, a three-dimensional two-layer model is set up to
study the generation of internal tides by tidal flows over a submerged seamount/ridge
in the channel. Several numerical experiments with different topographic features,
upper layer depths, tidal flows and background currents are carried out to study the
variations of the induced internal tides. It is shown that, for the specific stratification,
the seamount feature, the slope, the initial upper layer depth and the imposing
driven force determine the Froude number near the seamount peak. Once when the
Froude number is supercritical, the associated maximum amplitude of the induced internal
tide is so large that the internal tide begins to disintegrate, which brings about
severe variations of the current velocity and the water elevation fields, and the associated
induced baroclinic tidal energy around the seamount peak is much larger than
the barotropic one. The Richardson number greater than 1/4 is a criterion for stability
of shear flow. Since the maximum tidal velocity changes within 0 ∼ 360<sup>◦</sup> with time
in a period around the seamount peak, the induced internal tide does not stride the
seamount peak before it disintegrates, which is different from the two-dimensional
modeled results. The asymmetrical slope of the submerged seamount is a mechanism
for the asymmetrical internal tide generation.</p>