頁籤選單縮合
| 題 名 | 阿公店水庫淤泥沖刷起動之研究=A Study on the Critical Erosion Conditions for the A-Kung-Tien Reservoir Deposits |
|---|---|
| 作 者 | 賴進松; | 書刊名 | 臺灣水利 |
| 卷 期 | 46:3=183 1998.09[民87.09] |
| 頁 次 | 頁76-83 |
| 分類號 | 443.96 |
| 關鍵詞 | 粘性淤泥; 臨界流速; 臨界剪應力; 沖刷延時; Cohesive deposit; Critical velocity; Critical shear stress; Dry density; Erosion duration; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文針對阿公店水庫底床的粘性淤泥進行水槽沖刷試驗,探討淤泥沖刷起動時之 現象,分析水流作用與淤泥特性間的關係。粘性淤泥受水流沖刷,作用於粘土顆粒上的力,除 了水流剪應力、上舉力及顆粒自身重力外,尚有顆粒之間的粘結力;粘性淤泥沖刷起動現象 ,一般難以用定性之觀察給予臨界起動狀態下定義,本文利用 McNeil 等 (1996) 研究粘性 淤泥之臨界起動狀態所建議之條件來加以比較分析。採用阿公店水庫底床淤泥進行沖刷試驗 發現,水流流速或底床剪應力與沖刷延時間可迴歸得到一漸近趨勢線,當沖刷延時增長時, 漸近線將趨於臨界值,此臨界值即為沖刷起動之水流條件。由沖刷試驗結果分析可知,代表 水庫粘性淤泥壓密程度之乾密度與水流臨界流速或臨界剪應力,可建立指數型之迴歸關係式 ,而此關係式與其他研究者所建立之關係式具有相同之型式。 |
| 英文摘要 | By using the sediment deposits collected from the A-Kung-Tien reservoir, laboratory experiments have been conducted to study the mechanism of sediment erosion. Except particle weight, drag froce and lift force, cohesive force becomes a predominant force concerning resuspension resistance fo the deposits with cohesiveness. Based on the definition proposed by McNeil, et al (1996), the critical conditions of erosion are investigated quantitatively. According to the experimental measurements, for each deposit sample, the flow velocity or bed shear stress can be plotted against erosion duration to obtain a fitting curve approaching a constant value which can be defined as the critical velocity or critical shear stress to initiate the movement of deposits, respectively. In addition, the dry density representing the condition of consolidation is highly correlated to the critical velocity as well as to the critical shear stress, and an exponential function is established for further applications. |
本系統中英文摘要資訊取自各篇刊載內容。