【摘要】：針對近年來黃河內(nèi)蒙段防洪、防凌形勢嚴(yán)峻,河槽萎縮日益加重等問題,分析了黃河內(nèi)蒙段頭道拐斷面河床沖淤演變特征。通過同流量水位變化,分析該河段河床沖淤變化發(fā)現(xiàn):該河段在2008年以前呈微淤狀態(tài),在2008年以后呈沖刷趨勢,并有"凹岸沖刷、凸岸淤積"的特點(diǎn);依據(jù)頭道拐水文站的水文資料及遙感數(shù)據(jù)影像的分析,分別以1987年頭道拐河道橫向水深變化及平面河勢變化為基礎(chǔ)分析了2006、2010、2014年頭道拐河道的相應(yīng)變化,發(fā)現(xiàn)在水流作用的影響下,彎曲河道凹岸的沖刷速度大于凸岸的淤積速度,河道形成旋渦回流。以上結(jié)果均是在水流條件及外界條件的共同作用下造成的,水沙條件變化必將導(dǎo)致河道演變,研究水沙條件變化規(guī)律有利于充分認(rèn)識河床演變規(guī)律,為今后解決防洪、防凌問題提供依據(jù)。
[Abstract]:In view of the problems of flood control, ice prevention and river channel shrinkage in the inner Mongolia section of the Yellow River in recent years, the characteristics of river bed scouring and silting in the head turn section of the inner Mongolia section of the Yellow River are analyzed. Through the analysis of the change of river bed scouring and silting in the same discharge water level, it is found that the reach shows a state of micro-silting before 2008 and a scouring trend after 2008, and has the characteristics of "concave bank scour and convex bank siltation". Based on the analysis of hydrological data and remote sensing data images of Tou Dao roundabout Hydrological Station, based on the variation of transverse water depth and plane river regime in 1987, the corresponding changes of the first turn channel in 2006, 2010 and 2014 are analyzed respectively. it is found that under the influence of water flow, the scouring speed of the concave bank of the curved channel is greater than that of the convex bank, and the channel forms a vortex reflux. The above results are caused by the combined action of water flow conditions and external conditions, and the change of water and sediment conditions will lead to the evolution of river courses. The study of the change law of water and sediment conditions is helpful to fully understand the evolution law of river bed and provide the basis for solving the problems of flood control and ice prevention in the future.
【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;內(nèi)蒙古農(nóng)業(yè)大學(xué)職業(yè)技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51369021)
【分類號】：TV147

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