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Barotropic instability mechanism analysis to development of low-salinity water lenses outside the Changjiang Estuary

ZHANG Wenjing;ZHU Shouxian;RUAN Kun;PENG Jian;College of Meterology and Oceanography,PLA Univ.of Sci.& Tech.;College of Harbor,Coastal and Offshore Engineering,Hohai University;  
Barotropic instability mechanism analysis was carried out to research the dynamic mechanism of the low-salinity water lenses(LSWL)in the expansion of the Changjiang diluted water(CDW).Based on the analysis of the LSWL's character in 1977summer,the initial LSWL was taken as small disturbance, and its equation founded to describe the motion of LSWL.The solution of the equation was obtained by WKBJ method,and was used to discuss the impact of the quickly varying wave(namely inertial-gravity wave)and the slowly varying wave(namely residual current)on LSWL.And the equation of energy evolution was founded,which was controlled by slowly varying wave packet.The main conclusion is that the quickly varying wave makes negligible influence on LSWL,but the slowly varying wave is helpful for the develop ment of LSWL because of depth increase when LSWL moves from the river mouth to the northeast.
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