多方式特性法應用於採沙坑運移之研究

Abstract

本研究以李式(1992) 陳氏(1994) 臧氏(1995)及陳氏(1996)所發展之一維非均勻質輸沙模 式為基礎,在數值方法上,驗證特徵值與特徵向量之推求方法,在底床或水理條件驟變的情 行下,仍能維持模式之穩定.並擴充模式下游邊界之能力.最後探討模式於不平衡輸沙情形 下泥沙運移之行為,期就能河道中採沙坑的運移有進一步的了解.最後,以李氏(1990)所進 行之採沙坑運移試驗資料,對模式之模擬結果做深入的探討. This study, based on the coupled non-uniform sediment multi-mode characteristi csmodel developed in series by Li(1992), Chen(1994), Tsang(1995),and Chen(1996 ), in volves the use of modified eigenvalues and eigenvectors and identifies t hemodel's stabilty under radical chang of hydraulic conditions. The study also enlarges the model's capability of imposing downstream boundary conditions.Sim ulations of a mining pit case are then performed to look into its migrationphe nomena under the condition of non-equilibrium sediment transportation.Finally, the simulation results are compared with the experimental data obtainedby Li et al.(1990) and intensive discussions of the results are also given.