Bottom Sediment Suspension under Irregular Surface Wave Conditions

Resumo

The authors study how the spectral shape of irregular surface waves affects the bottom sediment suspension. The features of the frequency distribution of the energy of synchronous fluctuations of water flow velocity series and the concentration of suspended particles are analyzed. It is shown that the maximum mutual energy of synchronous oscillations of the velocity and concentration series can occur at both low and at high frequencies in a wide range of passing waves. In a narrow spectrum, synchronous oscillations dominate in the region of the main energy-carrying frequency. It is also shown that the geometric shape of wave groups has a direct impact on the resuspension intensity. In groups of waves with a symmetrical profile, the suspension is more intense compared to groups with pronounced spatial asymmetry. In the groups of waves with a symmetrical profile, the bottom sediments are suspended more intensely than in groups with pronounced spatial asymmetry.