郁江贵港城区河段河道演变分析

River channel evolution in Guigang urban area,the Yujiang River

郁江的河道演变对河流的堤防安全、河势稳定、防汛抢险等影响重大。以郁江贵港市区河段作为研究对象,通过实测资料,分析了研究河段的历史演变,对24个典型断面的断面特征和河床演变的趋势进行分析。结果表明:研究河段在近30 a河槽变化不大,河势相对较为稳定,河道各个断面有冲有淤且变化幅度较小;在现有水沙条件下,未来河段将呈缓慢淤积的趋势,贵港和桂平航运枢纽对河势及冲淤变化影响不大。

The evolution of the channel of the Yujiang River has a major impact on the safety of the river dyke,the stability of river,and regime and flood prevention.Taking the reach in Guigang urban area of the Yujiang River as the research object,the historical evolution of the study section is analyzed through the measured data,and the cross-section characteristics of 24 typical sections and the trend of river bed evolution are analyzed.The results suggest that:the study reach has not changed much in the past 30 years,and the river regime is relatively stable,and all sections of the channel have erosion and siltation and the change range is small;under the existing water and sediment conditions,the river reach will show a trend of slow sedimentation in the future,and the Guigang and Guiping shipping hubs will have little effect on the river regime and changes in erosion and siltation.