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題 名 | 連續防砂壩之水理特性研究 |
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作 者 | 潘建中; 黃宏斌; | 書刊名 | 農業工程學報 |
卷 期 | 41:3 1995.09[民84.09] |
頁 次 | 頁38-46 |
分類號 | 443.92 |
關鍵詞 | 防砂壩; 水理特性; 連續防砂壩; Sabo dam; Hydraulic characteristic; Series of sabo dams; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要探討單一與連續防砂壩在淤滿過程中之水理特性。研究中以防砂壩溢口堰流公式之推導為基礎,由因次分析,求得流量修正係數之無因次參數,配合定床水槽試驗加以分析探討,以求得在不同壩距或有效壩高時,隨上游坡度之改變,流量與水深之關係及水理之變化。 本研究使用兩座梯形溢口防砂壩從事水槽試驗。試驗項目分壩上游未淤滿及全淤滿二類,底床坡度在0.012到0.022共三種,流量為0.0115到0.0427 cms各六種,壩距為3至7公尺三種。 經分析90組有效數據後知,防砂壩未淤滿時,以寬頂堰流公式求算流量;淤滿時以曼寧公式求算會較合宜。全淤滿時上游壩壩翼束縮將影響水位產生壅高,其影響距離隨坡度之增加會有很快速的縮小。全淤滿時當兩座壩間之壩距加長時,下游壩之上游水深會漸次增大,最後將趨正常水深。此時若以曼寧公式演算所求之流量會低估。於本研究之試驗範圍,在不同壩距下,可分別以水深之函數修正之。未淤滿時由於未列入各項損失,單一防砂壩之流量若以理論寬頂梯形堰流公式演算會有高估,本研究建議可以水深與堰高之函數修正之。 |
英文摘要 | The object of this study was to explore the hydraulic characteristic of unique and series of Sabo dams during depositing process. Based on derivation of weir formula for Sabo dam, this study collected dimensionless parameters of flow discharge by dimensional analysis as well as the data from rigid-bed flume experiments to explore the relationship between flow discharge and its depth with different dam distances, lengths and upstream slopes. This study used two dams with trapezoidal spillway in flume experiment. There were two types of deposit conducted in flume experiment. One was potential deposit. The other was full deposit. Three slopes ranging from 0.012 to 0.022, six discharges from 0.0115 to 0.0427cms. Distances between two dams was designed as three, five and seven meters. After analyzing 90 sets of available data, the following results can be obtained. For Sabo dams, broad-crested weir formula would be more convenient in condition of potential deposit; while Manning's formula in condition of full deposit. In condition of full deposit, the local rising of water profile would be occurred by contraction of both sides of dam wings. And, the effect distance would be less significant fast with slope. When distance between two dams changed longer in case of full deposit, the water depth after lower dam site would be increased to normal depth. And the flow discharge calculated by Manning's formula could be smaller. In this study, the correction factors functioned of water depth could be suggested to modify the formula in different dam distance. For neglecting some loses, the flow discharge of unique Sabo dam calculated by theoretical broad-crest weir formula would get higher value. In this study, the correction factors functioned of the ratio of water depth and weir height could be suggested to modify the theoretical formula. When dam distance existed, the modification could be smaller. The modification equation for 3 meter's dam distance could be improved by some correction factors functioned of the ratio of water depth and weir height. |
本系統中英文摘要資訊取自各篇刊載內容。