【摘要】：揚(yáng)動(dòng)流速是泥沙由間歇性滾動(dòng)、滑動(dòng)、跳躍運(yùn)動(dòng)轉(zhuǎn)化為懸浮運(yùn)動(dòng)的臨界流速,確定揚(yáng)動(dòng)流速對(duì)于預(yù)判沙質(zhì)河床沖淤狀態(tài)具有重要意義。在回顧前人研究成果的基礎(chǔ)上,認(rèn)為揚(yáng)動(dòng)流速概念適用的對(duì)象主要是非黏性沙質(zhì)顆粒,它們的揚(yáng)動(dòng)狀態(tài)同含沙量垂線分布圖形存在的關(guān)系較為清晰,從而依據(jù)張紅武及張羅號(hào)先后建立的含沙量垂線分布公式分別計(jì)算了不同懸浮指標(biāo)下相對(duì)含沙量為0.85時(shí)的相對(duì)水深,得到一定水流條件下的顆粒懸浮高度擬合關(guān)系式,再通過假定泥沙揚(yáng)動(dòng)的臨界狀態(tài)為顆粒實(shí)際離開床面的運(yùn)動(dòng)高度已達(dá)相對(duì)水深0.03,即可得出泥沙揚(yáng)動(dòng)流速公式。通過與沙玉清和張羅號(hào)揚(yáng)動(dòng)流速公式的比較以及沙質(zhì)河床實(shí)測(cè)水沙資料的檢驗(yàn),結(jié)果表明本文建立的泥沙揚(yáng)動(dòng)流速公式能較好地描述天然河流的泥沙揚(yáng)動(dòng)規(guī)律。
[Abstract]:The lifting velocity is the critical velocity of sediment from intermittent rolling, sliding and jumping motion to suspended motion. It is important to determine the lifting velocity for predicting the scour and deposition state of sandy riverbed. On the basis of reviewing the previous research results, it is considered that the main objects for the concept of lifting velocity are non-viscous sand particles, and the relationship between their lifting state and the distribution pattern of vertical distribution of sediment content is relatively clear. According to the vertical distribution formula of sediment content established by Zhang Hongwu and Zhang Luo respectively, the relative water depth of 0.85 relative sediment content under different suspended indexes is calculated, and the fitting formula of particle suspended height under certain water flow condition is obtained. By assuming that the critical state of sediment uplift is that the moving height of particles leaving the bed surface has reached the relative water depth of 0.03, the formula of sediment lifting velocity can be obtained. By comparing with the formula of lifting velocity of Shayuqing and Zhangluo, and checking the measured data of water and sediment in sandy river bed, the results show that the formula established in this paper can better describe the law of sediment movement in natural rivers.
【作者單位】： 內(nèi)蒙古農(nóng)業(yè)大學(xué)水利與土木建筑工程學(xué)院;
【基金】：內(nèi)蒙古水利科技重點(diǎn)項(xiàng)目 國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC04022500)
【分類號(hào)】：TV142

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