本文選題：壩下游 + 枯水位　； 參考：《水利水運(yùn)工程學(xué)報(bào)》2017年04期

【摘要】：三峽水庫(kù)蓄水后,葛洲壩樞紐下游近壩河段內(nèi)枝城枯水位降幅較小,但宜昌及宜都等位置枯水位降幅較大,且隨時(shí)間變化顯示出非均勻下降的特征。為揭示該現(xiàn)象成因,依據(jù)宜昌至枝城河段內(nèi)枯水位、地形、河床組成等實(shí)測(cè)資料分析了各因素的時(shí)變特征,并采用分離變量法計(jì)算分析了枯水位非均勻下降的機(jī)理。結(jié)果表明:宜昌枯水位在2008年前降幅小且下降速度慢,2008年以后降幅增大且下降速度加快;宜都至枝城區(qū)間沖刷是引起宜昌枯水位下降的主導(dǎo)因素,宜都以上河床變形、枝城水位下降為次要因素;宜都以上河床粗化引起阻力調(diào)整,是導(dǎo)致2008年前宜昌枯水位降幅小的主要原因;2012年后,宜昌至枝城段河床變形和阻力調(diào)整余地都已不大,未來(lái)宜昌枯水位穩(wěn)定性主要取決于枝城水位變幅。
[Abstract]:After the three Gorges Reservoir impounded, the water level of Zhicheng in the lower reaches of Gezhouba Project decreased slightly, but the water level of Yichang and Yidu decreased more and more, and the variation of the water level showed the characteristics of non-uniform decline with time. In order to reveal the cause of the phenomenon, the time-varying characteristics of the factors are analyzed based on the measured data of the dry water level, topography and river bed composition in the reach of Yichang to Zhicheng River, and the mechanism of the uneven decline of the dry water level is calculated and analyzed by using the method of separating variables. The results show that the decline of the dry water level in Yichang is small and slow before 2008, and the decrease is increasing and the decreasing speed is quickening after 2008, the erosion between Yidu and Zhicheng is the main factor that causes the decline of the low water level in Yichang, and the deformation of the riverbed above Yidu, The water level in Zhicheng is a secondary factor; the resistance adjustment caused by the coarsening of the riverbed above Yidu is the main reason leading to a small decrease in the dry water level before 2008; after 2012, the bed deformation and resistance of the section from Yichang to Zhicheng have been limited. In the future, the stability of water level in Yichang mainly depends on the variation of water level in Zhicheng.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家科技支撐計(jì)劃課題(2013BAB12B02) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51579185,51339001)
【分類號(hào)】：TV147
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本文編號(hào)：1853405