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頁籤選單縮合
題 名 | 河川束縮段滯洪區之水理分析=Hydraulics Analysis of Flood-Plain Near River |
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作 者 | 鄧慰先; 鄭思蘋; 許銘熙; | 書刊名 | 臺灣水利 |
卷 期 | 45:4=180 1997.12[民86.12] |
頁 次 | 頁24-35 |
分類號 | 443.046 |
關鍵詞 | 河川束縮; 超臨界流; 震波; 數值模擬; 全變量消去法; River contractions; Supercritical flow; Shock wave; Numerical simulation; Total variation diminishing; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要在發展一河川束縮段滯洪區之水理分析數值模式。 臺灣中上游河川束縮 段,常由於斷面束縮而形成臨界流,故河川束縮附近之流況十分複雜,需考慮使用較精密之 水理分析方法。目前國內河川束縮段之水理分析,通常以一維定量流模式為計算之主要工具 ,但簡易的一維模式常無法反應複雜之水理現象,尤其是河川超臨界流束縮段附近引起斜震 波所產生之水面壅高等情況。本文發展一河川束縮段滯洪區二維水理演算模式,並以苗栗縣 後龍後龍溪束縮段為模式之應用對象,探討該河段之水理情況。模擬結果顯示束縮堤距後, 使河川水位產生壅高。本文發展之水理模式可計算河川束縮段滯洪區之水理特性。 |
英文摘要 | The main purpose of this paper is to develop a mathermatical model for hydraulics analysis of flood-plain near river contractions. The supercritical flow always takes place at the upstream and midstream of the river in Taiwan due to the river contractions. Because of the complicated phenomena of the river flow, the advanced hydraulics analysis should be taken into consideration. At present, one-dimensional steady flow models are usually employed to calculate the water stage of the supercritical flow in river contractions. However, the simulated results from the simplified models can not response the complicated characteristics of the supercritical flow, such as water stage increasing caused by the contraction of river section or the oblique shock wave. This paper develops a two-dimensional river flow model which has been employed to simulate the flow field of the river contraction in Ho-Long creek. The simulated results show that the river stage increases with decreasing channel width. The mathematical model developed in this study can be used for simulating the flow characters of the river contractions. |
本系統中英文摘要資訊取自各篇刊載內容。