Tidal interaction of stratified flow in a drowned valley on the Sanriku ria coast
Abstract
The mooring observations were conducted at two points of the north and south mouth in a drowned valley on the Sanriku ria coast, Japan, from 2012 through May 2014. Two current systems were deployed at the bottom, comprising an Acoustic Doppler Current Profiler and a temperature-salinity-depth sensor at the surface and the bottom. Observations have revealed a broad variety of different interactions depending upon the strength of tidal forcing. Tidal and shorter waves strengths with non-periodic frequencies. The astronomical tide explained these non-periodic frequencies. The semi-diurnal and the shorter periods were detected to occur simultaneously. The result probably implies that semi-diurnal phenomena would generate the shorter one. Diurnal fluctuations were well reproduced by predicted tidal waves but semi-diurnal one was not. The tidal flow likely slackens, subsequently evolving into travelling internal bores or surges. On-going numerical experiment supported our observational results. Related analyses will show the detail phenomena above using the observation and numerical modeling, with a discussion of a propagating system of barotropic and baroclinic tidal waves and vertical propagations of internal waves.
- Publication:
-
American Geophysical Union, Ocean Sciences Meeting
- Pub Date:
- February 2016
- Bibcode:
- 2016AGUOSEC24B1114I
- Keywords:
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- 4546 Nearshore processes;
- OCEANOGRAPHY: PHYSICALDE: 4558 Sediment transport;
- OCEANOGRAPHY: PHYSICALDE: 4560 Surface waves and tides;
- OCEANOGRAPHY: PHYSICALDE: 4568 Turbulence;
- diffusion;
- and mixing processes;
- OCEANOGRAPHY: PHYSICAL