Numerical Simulation of Flow and Bed Evolution in Alluvial River with Levees

• Main Authors: Chih-Heng Tsai, 蔡智恆
• Other Authors: Chang-Tai Tsai
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/20260358264046841450

博士 === 國立成功大學 === 水利及海洋工程學系 === 88 === The present paper is aimed to develop a numerical model based on an explicit finite-difference method for simulating unsteady flow and bed variations in alluvial rivers. A set of experimental data on channel-contraction is used to examine the ability of this model. The numerical results are satisfactory, as clearly observed from comparisons with measured data. Also, two bed-load formulas are chosen for simulating the experiment. The findings indicate that quantitative effect is the influence of the bed-load formula on bed evolution. The applicability of the model can be performed by simulating the bed evolution of Tseng-Wen River during flood stage. The main-channel would occur intense erosion and form a larger cross-section in the earlier stage of swell. At the same time, the flood-plains far away from the main-channel would silt. Furthermore, the suspended-sediment concentration of the main-channel is more heavy and more uniform in the transverse direction, as compared to that of flood-plains.