TY - GEN

T1 - A semi-empirical formula for wave attenuation over muddy bed under current

AU - Xie, Wenang

AU - Shibayama, Tomoya

N1 - Publisher Copyright:
© 2018 World Scientific Publishing Co. Pte. Ltd.

PY - 2018

Y1 - 2018

N2 - Theoretical and laboratory studies are performed to analyze the wave attenuation phenomenon over fluid mud under current. In the theoretical part, a semi-empirical formula is derived to model the attenuation process under current. Based on the linear wave theory, the change of wave amplitude is related with the averaged damping effect of the muddy bed. By solving a differential equation, the exponential decay of the wave amplitude is confirmed. A function called damping function is used in the formula, and it is expanded into a series of wave parameters and some undetermined coefficients called auxiliary damping factors. Based on the assumption that the mud properties do not change under current, the formula is combined with the dispersion relation for linear wave under uniform current to describe the attenuation process under current. Laboratory experiments are conducted first without current. The data of wave attenuation are collected and inserted to the formula obtained in the theoretical analysis to figure out the values of the auxiliary damping factors. The second set of experiments is conducted under current and the collected data are compared with the calculated values obtained by using the newly proposed formula with the dispersion relation. The result of comparison shows good applicability of the new formula to the wave attenuation under current.

AB - Theoretical and laboratory studies are performed to analyze the wave attenuation phenomenon over fluid mud under current. In the theoretical part, a semi-empirical formula is derived to model the attenuation process under current. Based on the linear wave theory, the change of wave amplitude is related with the averaged damping effect of the muddy bed. By solving a differential equation, the exponential decay of the wave amplitude is confirmed. A function called damping function is used in the formula, and it is expanded into a series of wave parameters and some undetermined coefficients called auxiliary damping factors. Based on the assumption that the mud properties do not change under current, the formula is combined with the dispersion relation for linear wave under uniform current to describe the attenuation process under current. Laboratory experiments are conducted first without current. The data of wave attenuation are collected and inserted to the formula obtained in the theoretical analysis to figure out the values of the auxiliary damping factors. The second set of experiments is conducted under current and the collected data are compared with the calculated values obtained by using the newly proposed formula with the dispersion relation. The result of comparison shows good applicability of the new formula to the wave attenuation under current.

KW - Fluid mud

KW - Semi-empirical formula

KW - Wave attenuation

UR - http://www.scopus.com/inward/record.url?scp=85048197638&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048197638&partnerID=8YFLogxK

U2 - 10.1142/9789813233812_0004

DO - 10.1142/9789813233812_0004

M3 - Conference contribution

AN - SCOPUS:85048197638

SN - 9789813233805

T3 - Proceedings of the 9th International Conference on APAC 2017

SP - 34

EP - 43

BT - ASIAN AND PACIFIC COASTS 2017

A2 - Suh, Kyung-Duck

A2 - Cruz, Eric C

A2 - Tajima, Yoshimitsu

PB - World Scientific Publishing Co. Pte Ltd

T2 - 9th International Conference on Asian and Pacific Coasts, APAC 2017

Y2 - 19 October 2017 through 21 October 2017

ER -