一維變量異重流模式之驗證與模擬比較

Verification and Comparison of Simulation for 1-D Unsteady Density Currents

10.29417/JCSWC.200906_40(2).0008

許少華(Shao-Hua Marko Hsu)；李孟霖(Meng-Lin Lee)；林正傑(Cheng-Chieh Lin)

異重流 ； 捲水係數 ； 阻力係數 ； 數值模擬 ； saline density currents ； turbidity currents ； water entrainment efficiency ； total drag coefficient ； numerical simulation

中華水土保持學報

40卷2期（2009 / 06 / 01）

114 - 124

繁體中文

本文以有限差分法求解一維異重流之方程式，利用陳秉鈞(2007)實驗數據加以率定捲水係數(E(下標 w))及總阻力係數(C(下標 d))之重要參數（實驗不易取得）。所建置之數值模式，可反映鹽水異重流於實驗入口之發展段以及於長距離（40公尺）傳輸的物理機制。此外，本文模擬渾水異重流（含不溶於水之砂或細泥）加以比較。根據波形分析後，發現不論渾水或鹽水異重流，兩者之沿程平均厚度的波型發展結果相似。

Finite Difference Method was applied for modeling the unsteady one-dimensional density currents. Experimental data (from Chen, 2007) was used to calibrate and determine two important parameters, water entrainment efficiency (E(subscript w)) and total drag coefficient (C(subscript d)). The 1-D model simulated well on both the entrance developing section and mass transfer of saline density current for a long distance (40m). Simulation of turbidity currents was compared with saline density currents. Based on the analysis of wave shape, and the depth-average thickness, both currents were similar.