V. A. Petrov*, G. V. Tlyavlina, N. A. Yaroslavtsev
Research Center “Sea Coasts” (branch of JSC TsNIITS), Sochi, Russia
* e-mail: demmi8@mail.ru
Abstract
Implementation of coastal protection measures on the coasts of the Arctic and Far Eastern seas with tidal phenomena determines increased requirements for the justification of design solutions when developing schemes for engineering protection of the shores. Wave-absorbing structures, including wave-absorbing beaches consisting of coarse-grained material, are the most effective ones for protecting coasts from the effects of waves. This is particularly true for northern seas, coasts of which are perpetually frozen. The calculation of such beaches should take into account the effect of periodical sea level fluctuations on the formed profile. Field studies of the effect of tidal sea level fluctuations on the profile of a wave-absorbing pebble beach are associated with certain difficulties. The most promising are experiments performed on hydraulic models in wave pools and flumes. The purpose of the work is to study in a wave flume the effect of tidal cycles on the profile of a wave-absorbing pebble beach. It was found that during high tide, when the initial backfill is exposed to waves, a beach profile is formed similar to the profile generated at a constant level corresponding to the maximum phase of the tide. At low tide, the pebble is displaced by waves seaward of the underwater border of the pebble beach formed at a constant water level. At high tide, the displaced pebble does not completely return to the upper part of the profile, which leads to a decrease in the width of the surface part of the beach and that in its wave damping efficiency. Based on studies performed in seas with a tide height of up to 3.6 m, when creating wave-absorbing pebble beaches, the volume of the initial backfill of beach-forming material must be increased by 5 % compared to the volume calculated for tidal seas.
Keywords
beach profile, high tide, hydraulic modeling, low tide, wave absorbing pebble beach
For citation
Petrov, V.A., Tlyavlina, N.A. and Yaroslavtsev, N.A., 2022. Physical Modeling of the Effect of Tidal Sea Level Fluctuations on Wave-Absorbing Pebble Beaches. Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 53–69. doi:10.22449/2413-5577-2022-3-54-70
DOI
10.22449/2413-5577-2022-3-54-70
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