A two-dimensional empirical eigenfunction model is proposed for the analysis and the prediction of beach profile change due to longshore and cross-shore sediment transports. Beach profile data from Redhill coast, Taiwan, measured every two months at 150 meters interval along the detached breakwaters are analyzed and the relative importance from two directions is investigated. Furthermore, by employing the method of Markov process and linear regression, a prediction model is formulated which takes into account the effect of breaking waves, bottom sediment and radiation stress of waves. This 2-D model is shown to be effective in the analysis and the prediction of beach changes near the coastal structures.

K e y Word Index-Paired Electrolysis, Aldoses, Flow Cell, Mediator Simultaneous anodic oxidation and cathodic reduction of aldoses in a divided flow cell were studied. T h e stream of the anolyte was an aqueous solution containing D-gluaose, sodium bromide, and sodium bicarbonate. The stream of the catholyts was also an aqueous solution containing xylose and sodium sulfite. The factors which affected both the anodic and cathodic reactions were studied. T h e results indicate that the Bow rates and temperatures of the anolyte and the catholyte, concentrations of the aldoses, pH values and the material of electrodes significantly affect both anodic and cathodic yields. T h e selectivities of gluconic acid in the anode and xylitol i n the cathode were very high. The power consumption of paired electrolysis in the flow system was fess than paired electrolysis in a batch system.