Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 2.821 IF 2.821
  • IF 5-year<br/> value: 3.048 IF 5-year
    3.048
  • CiteScore<br/> value: 2.90 CiteScore
    2.90
  • SNIP value: 1.191 SNIP 1.191
  • SJR value: 1.885 SJR 1.885
  • IPP value: 2.589 IPP 2.589
  • h5-index value: 25 h5-index 25
https://doi.org/10.5194/os-2017-33
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
31 May 2017
Review status
This discussion paper is under review for the journal Ocean Science (OS).
A study on some basic features of seiches, inertial oscillations and near-inertial internal waves
Shengli Chen, Daoyi Chen, and Jiuxing Xing Shenzhen Key Laboratory for Coastal Ocean Dynamic and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Abstract. Some basic features of seiches, inertial oscillations and near-inertial internal waves are investigated by simulating a two-dimensional (x-z) shallow basin initialized by a wind pulse. Two cases with and without the vertical stratification are conducted. For the homogeneous case, seiches and inertial oscillations dominate. We find even modes of seiches disappear, which is attributed to a superposition of two seiches generated at east and west coastal boundaries. They have anti-symmetric elevations and a phase lag of nπ, thus their even modes cancel each other. The inertial oscillation shows typical opposite currents between surface and lower layers, which is formed by the feedback between barotropic waves and inertial currents. For the stratified case, near-inertial internal waves are generated are generated at land boundaries and propagate offshore with increasing frequencies, which induce tilting of velocity contours in the thermocline.

The inertial oscillation is uniform across the whole basin, except near the coastal boundaries (~ 20 km) where it quickly declines to zero. This boundary effect is related to great enhancement of nonlinear terms, especially the vertical nonlinear term (w∂u / ∂z). With inclusion of near-inertial internal waves, the total near-inertial energy has a slight change, with occurrence of a small peak at ~ 50 km, which is similar to previous researches. We conclude that, for this distribution of near-inertial energy, the boundary effect for inertial oscillations is primary, and the near-inertial internal wave plays a secondary role.


Citation: Chen, S., Chen, D., and Xing, J.: A study on some basic features of seiches, inertial oscillations and near-inertial internal waves, Ocean Sci. Discuss., https://doi.org/10.5194/os-2017-33, in review, 2017.
Shengli Chen et al.
Shengli Chen et al.
Shengli Chen et al.

Viewed

Total article views: 183 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
149 20 14 183 2 10

Views and downloads (calculated since 31 May 2017)

Cumulative views and downloads (calculated since 31 May 2017)

Viewed (geographical distribution)

Total article views: 183 (including HTML, PDF, and XML)

Thereof 183 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 24 Jun 2017
Publications Copernicus
Download
Short summary
Simulations are used to examine the response of a shallow closed basin to a wind pulse. Even modes of seiches are found absent and interpreted. The inertial oscillation has opposite currents in vertical, due to the feedback between barotropic waves and currents. The horizontal distribution of near-inertial energy is primarily controlled by the boundary effect on inertial oscillations, and the near-inertial internal wave makes a secondary effect.
Simulations are used to examine the response of a shallow closed basin to a wind pulse. Even...
Share