Development of a Depth-Averaged Two-Dimensional Pier Scouring Model

• Main Authors: Chen, Yen-You, 陳彥酉
• Other Authors: 楊錦釧,謝德勇
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/32767061140556743096

碩士 === 國立交通大學 === 土木工程學系 === 99 === This study develops a depth-averaged two-dimensional pier scouring model to simulate both the contraction scour and the local scour properties due to vertical flow. The framework of the model developed is based on the depth-averaged two-dimensional mobile bed model by Hsieh (2003), in which employed the immersed boundary method is to deal with the internal pier boundary. The maximum vertical flow velocity and the corresponding sediment transport formula are taken into account to simulate the local scour phenomenon. The maximum vertical velocity regression formula is established from the velocity field simulated by a commercial 3-D model, CFX, through several hypothetical cases designed. Several bridge pier scouring experiment results are used to conduct the model calibration and parameter regression analysis to develop the empirical formula of local scour. Furthermore, the model is verified by using experiment results other than those for calibration. The verification studies show that the variation of the scour depth with respect to time around the bridge piers could be well simulated.