MIXING BY SHEAR INSTABILITIES OF THE LONGSHORE CURRENT

Proceedings of the International Conference on Coastal Engineering

J.C. Church¹  E.B. Thornton¹  J. Oltman-Shay² 

[1] Department of Oceanography, Naval Postgraduate School;Quest Integrated, Inc.

关键词: longshore current;    mixing;    shear instability;   

DOI  :  10.9753/icce.v23.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Shear instabilities of the longshore current are examined as a possible source of non-zero uV values (mixing) within the surfzone. This term is calculated using model generated stream functions whose amplitudes are calibrated with the observed turbulent kinetic energy spectrum. Data from the DELILAH experiment, conducted at the barred beach at Duck, North Carolina is used. Excellent agreement is found between the predicted range of shear instabilities and observations as seen in frequency-wavenumber plots. Maximum predicted values for u'2, v-'2 and WP are .04, .20, and .03 mVs2.

【 授权许可】

Unknown