黄河上游典型崩岸碍航河段航道整治

Waterway regulation for typical bank collapse obstructing reach in the upper Yellow River

针对黄河上游河段堤防或护岸崩塌、后退导致河道放宽、航槽淤积问题,进行了崩岸碍航河段航道整治方案研究。采用二维水流数学模型,计算黄河黑峡滩河段崩岸前后航槽内水动力条件变化,并对不同航道整治方案进行分析。结果表明:1)优良河段因崩岸或采砂等因素导致河床形态突变前航槽内水流条件(流速、流态等)改变,可为航道整治方案实施后航槽内通航水流条件提供重要参考。2)根据工程实施后效果观测,利用整治工程适当调整中、枯水的河宽,使挖槽内流速大小接近崩岸前流速,对维持挖槽稳定十分有效。

In view of the collapse and retreat of the embankment or revetment in the upper reaches of the Yellow River,which leads to the widening of the river channel and the siltation of the waterway,a waterway regulation plan for bank collapse obstructing reach is studied.A two-dimensional mathematical model of water flow is used to calculate the changes in hydrodynamic conditions in the navigation channel before and after the bank collapse in the Heixiatan section of the Yellow River,and the different channel regulation schemes are analyzed.The results show that:1)The flow conditions(velocity,flow pattern,etc.)in the navigable channel before the river bed morphology changes due to bank collapse or sand mining in the excellent river section can provide an important reference for the navigable flow conditions after implementation of the waterway regulation plan.2)According to the observation of the effect after the implementation of the project,using the regulation project to appropriately adjust the width of the middle and low waters to make the flow velocity in the navigable channel close to the flow velocity before the bank collapse,is very effective in maintaining the stability of the navigable channel.