References

NPG

Nonlinear Processes in Geophysics

NPG

Nonlin. Processes Geophys.

1607-7946

Copernicus Publications

Göttingen, Germany

10.5194/npg-20-935-2013

Asymmetric tide in Lake Vallunden (Spitsbergen)

Marchenko

A. V.

¹ ² Morozov

E. G.

Svalbard University Center, Longyearbyen, Spitsbergen, Norway

Sustainable Arctic Marine and Coastal Technology (SAMCoT), Centre for Research-Based Innovation (CRI), Norwegian University of Science and Technology, Trondheim, Norway

Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

04 11 2013

20 6 935 944

2013

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We observed strongly asymmetric tide in a channel connecting the Van Mijen Fjord and Lake Vallunden in Spitsbergen. The channel is approximately 100 m long, 10 m wide, and 1–2 m deep. Asymmetric tide was also observed in the lake. The form of the semidiurnal tide is described by a combination of only three harmonics (M2, S2 and M4) with different amplitudes and phases. The flood dominant form of the surface elevation in the channel (unlike the ebb dominant tide in the fjord) is formed over a horizontal distance of 50 m over a shallow bottom at the entrance to the channel. The tide in shallow places becomes asymmetric due to nonlinear effects caused by the influence of the bottom and especially by choking of the tidal flow over a sill that is located between the fjord and channel. We think that such a small distance, over which the form of the tide changes, is caused by the small scale of the channel related to the fjord. We suggest a numerical model related to these measurements.

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