Modeling the tidal bore on the Qiantang River, China:An application of FVCOM

摘要

The tidal bore is a typical hydraulic phenomenon that the water surface changes abruptly and surge forward in the front of a tidal wave. In this contribution, the FVCOM model has been used to simulate the tidal bore on the Qiantang River, China. The depth-averaged 2-D model results, like water levels and velocities agree well with the field data, and the typical bore scenes have been reproduced. This is consistent with the research of Pan et al. (2007) which used a depth-averaged 2-D numerical model, based on a Godunov-type scheme. The cell size could influence the modeled velocity to a large extent. However, the modeled 3-D velocity distributions is not obvious except those around the time of high slack water, if a small manning coefficient is used to obtain large current velocity when the bore pass by. When a large relatively manning coefficient is used, the vertical distributions of velocity become noticeable, but the magnitudes of velocity are smaller than the observations. It is expected that to solve this contradiction depends on the advances of friction coefficients.