Research of Numerical Modeling in Coastal Flow and Dispersion Coefficient

• Main Authors: Chi-Wei Chen, 陳志威
• Other Authors: Chin-Wu Lan
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/80675272339290040353

碩士 === 國立中興大學 === 土木工程學系 === 89 === Abstract 　　This research includes two parts. First, using two-dimensional depth-average governing equation with finite difference method of explicit scheme to solve a coastal flow which is incompressible, viscous, and do not consider the effects of the wind and Coriolis forces. The modeling region in this research is from Dong-Shi, Chia-Yie to Chiang-Chung, Tainan. To model a coastal flow during a tidal period 12 hours, we compare two different boundary conditions in the flow ,and then find the reasonable one. According to the condition, we make a further discussion in different eddy viscousity coefficients and manning coefficients, and then find the suitable ones. Second, according to the coast flow we have made, we discuss the relative variations of position of the groups of particles in different regions, and then estimate the relative dispersion coefficients by the relations of the groups of particles. In the other sides, we also discuss the situation of relative dispersion of the groups of particles by shortening grid size and non-uniform depth so as to know the further situation of groups of particles in the shortening grid size and non-uniform depth. According to dispersion coefficients we have estimated, the coefficients is smaller because we do not consider the effects of the wind, but they mostly still corresponding to the theory Fourth-three .