頁籤選單縮合
題 名 | 防砂壩下游河床之沖刷模式=The Scouring Model of the Channel Bed Below a Sabo Dam |
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作 者 | 連惠邦; 柴鈁武; | 書刊名 | 中華水土保持學報 |
卷 期 | 28:1 1997.03[民86.03] |
頁 次 | 頁59-68 |
分類號 | 443.92 |
關鍵詞 | 防砂壩最大沖刷深度; 清水流; 含滓流; Sabo dam; Maximum scour depth; Clear-water flow; Sediment-laden flow; |
語 文 | 中文(Chinese) |
中文摘要 | 防砂壩下游河床沖刷問題,對壩體安全、壩下游溪床人工護坦設計及其下游地區 泥砂沖淤平衡等具有深遠之影響。因此本文乃利用水流運動方程式、能量方程式、及泥砂顆 粒臨界推移力等理論,考慮溢壩水流在不同含砂量,如清水流、含滓流和土石流等流況下, 建立沖刷坑之最大沖刷深度及其沖刷深度之發展歷線理論模式,經與其他研究者試驗資料驗 證結果良好。研究顯示 1. 清水流最大沖刷深度方程式可表為 式中 h ��: 直垂方向之最大沖刷深度;D: 水舌厚度;d ��: 泥砂粒徑;��: 沖射流入射角 度;U ��: 沖射流入射初速;s : 比重。 2. 含滓流沖刷深度之時間變化方程式 式中 C: 含滓流含砂量;t: 時間;Z: 沖射流入射方向之沖刷深度。 3. 清水流摩擦阻力係數 f = 0.9 而含滓流具有較大之能量損失,其摩擦阻力係數 f = 0 .93。 4. 溢壩水流之泥砂含量達到臨界泥砂含量時, 沖刷坑逐漸回淤,其流動性狀為土石流之範 疇。 |
英文摘要 | Local scour in the channel bed below a sabo dam is one of the most ess ential factors of river stability and safety of dam body. This work presents study on the maximum depth of scour hole under equilbrium condition and scouring hydrograph of channel bed are presented by this paper. The derived equations are found to be quite satisfactory by comparing with the experiments data obtained from other studies. According to the experiments from researcher was analyzed by: h ��: maximum scour depth of vertical direction;D: thickness of nappe; d �� :grain diameter; ��:angle of jet; U ��: initial velocity of jet; s: specific weight. 2. Scouring hydrograph equation of sediment-laden flow can be written as C:volume concentration of grain; t:time; Z:scour depth of jet direction. 3. The friction coefficient of clear-water flow f=0.9, and the friction coefficient of sediment-laden flow f=0.93. 4. The scour hole will be deposited when the volume concentration of grain obtains the critical value. The charactistics of flow are belong to debris flow. |
本系統中英文摘要資訊取自各篇刊載內容。