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題名 | 二維沖積河流底床演變分段分離演算模式之研究=Two-Dimensional Piecewise-Uncoupled Model for Bed Evolution in Alluvial Rivers |
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作者 | 蔡智恆; 高偉騰; 蔡長泰; | 書刊名 | 力學 |
卷期 | 14:2 1998.12[民87.12] |
頁次 | 頁109-124 |
分類號 | 351.7 |
關鍵詞 | 沖積河流; 二維底床演變模式; 底床載公式; Alluvial rivers; Two-dimensional bed evolution model; Bed-load formulas; |
語文 | 中文(Chinese) |
中文摘要 | 本文旨在應用顯式有限差分法,建立一適用於沖積河流之二維底床演變數值模式。 利用一組窄縮渠道沖淤試驗,驗證模式之模擬能力,演算結果與觀測值頗為一致。並選取兩 種底床載公式進行比較,顯示底床載公式對河床演變具有定量之影響。實際應用上,本文以 曾文溪河段進行洪水歷程模擬。計算結果顯示,渠道之主深槽區域於洪漲初期即發生劇烈沖 刷而形成較大之主深槽斷面,距主深槽較之洪水平原則大致呈現淤積之現象。主深槽之懸浮 載濃度比洪水平原高,且橫向分佈較為均勻。 |
英文摘要 | 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 mode. 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 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. |
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