【摘要】：三峽水庫(kù)蓄水后沙量驟減使得荊江河段河床劇烈沖刷調(diào)整,下荊江急彎段"凸沖凹淤",部分彎道凹岸側(cè)淤積形成水下潛洲。這種不同于彎曲河道一般性演變規(guī)律的異�，F(xiàn)象勢(shì)必給下荊江的行洪、航運(yùn)及江湖關(guān)系變化等帶來(lái)新的影響,其內(nèi)在成因急需揭示�；谠陀^測(cè)資料分析,通過(guò)研究灘槽沖淤量及分布、灘體及河道形態(tài)特征等,全面揭示了近期下荊江急彎段"凸沖凹淤"的演變特征及河道形態(tài)響應(yīng)。結(jié)果表明,流量年內(nèi)過(guò)程重分配、來(lái)沙量及組成突變是下荊江急彎段"凸沖凹淤"的決定性因素。
[Abstract]:After the three Gorges Reservoir impoundments, the sediment volume of the Jingjiang River reach is reduced sharply, the river bed of the Jingjiang reach is adjusted sharply, the lower Jingjiang section is "convex scouring, concave silting", and part of the curved channel concave bank silts up to form a submerged bank. This unusual phenomenon, which is different from the general evolution law of curved river, will inevitably bring new influence to the flood discharge, shipping and the change of the relationship between rivers and lakes in the Lower Jingjiang River, and its internal causes need to be revealed urgently. Based on the analysis of prototype observation data, the evolution characteristics of "convex scour and concave silt" and the responses of channel morphology in the near future are revealed by studying the amount and distribution of erosion and siltation in the channel, the characteristics of the beach body and the shape of the river channel, and so on. The results show that the redistribution of discharge, the amount of sediment and the sudden change of composition are the decisive factors of "convex scouring, concave and silting" in the section of the lower Jingjiang River.
【作者單位】： 長(zhǎng)江水利委員會(huì)水文局;
【基金】：水利部公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)資助項(xiàng)目(201401021) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51579186)~~
【分類號(hào)】：TV147

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【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊云平;張明進(jìn);李松U，

本文編號(hào)：2306876