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題 名 | 八掌溪仁義潭攔河堰至道將圳攔河堰間河道沖刷初探=A Preliminary Investigation for Channel Erosion between Jen-I Weir and Tao-Chiang-Chun Weir of Pa-Chang River |
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作 者 | 陳春宏; | 書刊名 | 臺灣水利 |
卷 期 | 48:1=189 2000.03[民89.03] |
頁 次 | 頁86-93 |
分類號 | 443.64 |
關鍵詞 | 河道沖刷; 現場調查; 水工試驗; 數值分析; 起動流速; Erosion of channel; Field investigation; Hydraulic engineering experiment; Numerical model; Incipient motion; |
語 文 | 中文(Chinese) |
中文摘要 | 八掌溪仁義潭攔河堰至道將圳攔河堰間於民國 76 年至 86 年溫妮颱風後河道高 程差最大超過二十公尺,其沖刷現象甚為嚴重。本文針對此現象利用現調查、水工試驗及數 值模式分析進行探討,藉此了解其沖刷原因,以供工程單位於工程設計時之參考。本文除利 用現場調查了解土樣之特性及沖刷原因外,為了解當河道流速達何值時河道即產生沖刷,乃 以水工試驗求出現場土樣之起動流速,並以 NETSTARS 模式進行河道模擬分析,數值分析時 模式之參數以道將圳進水口模型試驗資料作為檢定,進而模擬各年重現期距流量時各斷面可 能之沖刷。利用溫妮颱風後之斷面資料,由數值分析結果得當二年重現期距時在斷面 95 至 繼面 101 (即仁義潭攔河堰)皆達到土樣之起動流速, 故未來此河段在目前之河床坡度下 仍具持續沖刷潛勢。 |
英文摘要 | The maximum channel erosion exceeds 20 meters in the reach between the Jen-I weir and the Tao-Chiang-Chun weir of the Pa-Chang River surveys from 1987 to 1997. It reveals that the erosion is very serious. In this study the field investigation, hydraulic experiment and numerical analysis are used to study and realize the reasons of the channel erosion. The study results can be used for the planning and design of hydraulic structure. In this paper the field investigation is used to understand the soil characteristics of channel bed and the channel erosion. Besides the hydraulic experiment technique will be used to determine the incipient motion of the cohesive deposits on the river bed. Finally, the NETSTARS model is applied to calculate the flow field of the channel for various return periods of flood discharge. The results from the experimental and the numerical analysis show that the flow velocities in 2-year flood discharge at sections 95 to 101 are greater than the incipient motion of the cohesive deposits, and the channel bed have a trend of erosion in future. |
本系統中英文摘要資訊取自各篇刊載內容。