【摘要】：河道裁彎及三峽工程運(yùn)用對(duì)荊江石首河段的河床演變產(chǎn)生了顯著影響。結(jié)合實(shí)測(cè)水沙及地形資料分析,研究了該河段近50年來(lái)的河床演變特點(diǎn),主要包括河床沖淤、平面及斷面形態(tài)調(diào)整三個(gè)方面。分析結(jié)果表明:兩次裁彎使得石首河段平面形態(tài)發(fā)生顯著調(diào)整,1966-1975年該河段深泓平均擺幅達(dá)42.0m/a,且總體向左岸擺動(dòng)。三峽工程運(yùn)用后,大規(guī)模護(hù)岸工程的實(shí)施使石首河段的平面形態(tài)趨于穩(wěn)定,深泓平均擺幅減小到29.8m/a,但北門(mén)口下段、調(diào)弦口彎道等位置的深泓擺動(dòng)仍較為劇烈,使得這些局部河段岸線崩退現(xiàn)象十分明顯。此外還分析了石首河段斷面形態(tài)的調(diào)整過(guò)程,并建立了河段平灘河槽形態(tài)參數(shù)與前5年汛期平均水流沖刷強(qiáng)度的經(jīng)驗(yàn)關(guān)系式,用于反映河段平灘河槽形態(tài)隨水沙條件的變化趨勢(shì)。
[Abstract]:The river bed evolution in the Shishou reach of Jingjiang River has been significantly affected by the river channel bend and the application of the three Gorges Project. Based on the analysis of measured water and sediment and topographic data, the characteristics of river bed evolution in the last 50 years are studied, including three aspects of river bed erosion and siltation, plane and section shape adjustment. The results show that the plane shape of the reach of Shishou River is significantly adjusted by two cutting bends, and the average amplitude of the deep reach reaches 42.0 m / a during 1966-1975, and the total swinging to the left bank. After the operation of the three Gorges Project, the implementation of the large-scale bank revetment project has stabilized the plane shape of the Shishou reach, and the average swing amplitude of the deep Wang has been reduced to 29.8 m / a, but the deep wobble of the lower section of the North Gate mouth and the bend of the chord adjusting mouth is still quite intense. It is very obvious that the shoreline collapse and retreat in these parts of the river. In addition, the adjustment process of section shape in Shishou reach is analyzed, and the empirical relationship between the shape parameters of flat beach channel and the average water flow scour intensity in the previous 5 years is established. It is used to reflect the changing trend of the flat channel shape with the water and sediment conditions in the reach.
【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)家自然科學(xué)基金項(xiàng)目(51579186,51339001) 國(guó)家重點(diǎn)研發(fā)計(jì)劃課題(2016YFC0402303/05)
【分類(lèi)號(hào)】：TV147

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