沙颍河三八村切滩段航槽稳定性分析

Stability analysis of navigation channel in Sanba village beach cutting section of Shaying River

以沙颍河阜阳闸站1972—2016年水沙原型资料为基础,利用SPSS、Matlab等工具,采用RS分析和小波分析等方法,研究三八村河段来水来沙特性及变化趋势;基于2017年及2019年工程河段实测地形资料,分析近期河势变化情况及河床冲淤特性,揭示该河段河床演变的主要特点和规律。结果显示:在径流量未发生系统增加或减少的前提下,河道输沙量和含沙量均呈明显降低趋势;预测工程河段输沙量与含沙量未来一段时间整体呈现减小的趋势;自然演变条件下,整治工程段河道滩地基本稳定,主槽微冲,冲刷幅度较小,河道相对比较稳定;工程不会根本上改变河段的冲淤特性,从长远来看,工程后弯道主流会逐渐趋向于新开河槽,河床仍将保持冲刷下切的趋势。

Based on the prototype data of water and sediment from 1972 to 2016 at Fuyang sluice station of Shaying River,using tools such as SPSS,MATLAB,etc.,and adopting R S analysis and wavelet analysis methods,we study the characteristics and change trend of water and sediment from Sanbacun reach.Based on the measured topographic data of the project reach in 2017 and 2019,we analyze the recent changes of river regime and characteristics of riverbed erosion and deposition to reveal the main characteristics and laws of riverbed evolution in this reach.The results show that under the premise of no systematic increase or decrease of runoff,the sediment discharge and sediment concentration in the river course are obviously decreased;The sediment discharge and sediment concentration in the river reach of the project are predicted to be decreased in the future;Under the natural evolution condition,the floodplain of the river course of the project section is basically stable,the main channel is slightly scoured,the scour range is small,and the river course is relatively stable;The project will not fundamentally change the scouring and silting characteristics of the reach.In the long run,the main stream of the bend after the project tends to open a new channel,and the riverbed will still maintain the trend of scouring and cutting down.