本文選題：河灣 + 平面形態(tài)演變��； 參考：《水力發(fā)電學(xué)報》2017年06期

【摘要】：目前對三峽水庫運行后下游水文泥沙特性變化、河道沖刷與崩岸等問題已有認(rèn)識,但對河灣平面形態(tài)演變還少見論述。本項研究基于研究區(qū)枯水期遙感影像,分析了三峽水庫運行10余年來荊江段枯水河灣平面形態(tài)的演變特征。結(jié)果表明,枯水河灣的中心線長度、凸岸長度、凹岸長度、彎曲率和中心軸長度存在顯著變異,以下荊江段的變異程度更大,凸、凹岸及上、下荊江段在演變過程上存在非同步性。上荊江段凹岸先于凸岸發(fā)生顯著變異,且平面形態(tài)演變以凹岸沖刷延伸占主導(dǎo)作用,下荊江段凸岸先于凹岸顯著變異,并以凸岸沖刷收縮占主導(dǎo)。大部分河灣尤其在下荊江,表現(xiàn)為面積、平均寬度明顯增加,而中心線長度、彎曲率與中心軸長度減小,河灣發(fā)展具有河道沖刷展寬但彎曲退縮的特征。還討論了平面形態(tài)演變與凸、凹岸沖淤變化的關(guān)系。
[Abstract]:At present, the changes of hydrologic and sediment characteristics, channel erosion and bank collapse in the lower reaches of the three Gorges Reservoir have been recognized, but the evolution of the river bay plane is rarely discussed. Based on the remote sensing images of the dry season in the study area, the evolution characteristics of the flat shape of the low water estuary in Jingjiang reach during the past 10 years of operation of the three Gorges Reservoir are analyzed. The results show that there are significant variations in the centerline length, convex bank length, concave bank length, bending rate and central axis length of the low water estuary, and the variation degree of the Jingjiang section below is greater, convex, concave and upper. There is nonsynchronism in the evolution of the lower Jingjiang section. The concave bank of the upper Jingjiang section had significant variation before the convex bank, and the plane morphology evolution was dominated by the erosion extension of the concave bank, the significant variation of the convex bank in the lower Jingjiang section was earlier than the concave bank, and the dominant factor was the erosion and contraction of the convex bank. Most of the estuaries, especially in the lower Jingjiang River, show a significant increase in area and average width, while the centerline length, the bending rate and the central axis length decrease. The river bay development has the characteristics of river channel scouring and bending and shrinking. The relationship between the evolution of plane morphology and the erosion and deposition of convex and concave banks is also discussed.
【作者單位】： 湖北民族學(xué)院生物科學(xué)與技術(shù)學(xué)院;湖北民族學(xué)院生物資源保護(hù)與利用湖北省重點實驗室;
【基金】：國家自然科學(xué)基金(31460132) 湖北民族學(xué)院博士啟動基金(D2014196)
【分類號】：TV147
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本文編號：1784752