三峡水库蓄水以来重点淤积水道黄花城河床演变及航道变化

Evolution of Huanghuacheng reach and variation of waterway after impoundment of the Three Gorges Reservoir

针对三峡水库蓄水以来常年回水区重点淤积水道黄花城出现泥沙累积性淤积的问题,根据三峡水库蓄水以来原型观测资料,分析黄花城水道蓄水以来水位变化、泥沙冲淤特性、典型断面冲淤变化和等深线变化,对该河道的航道条件变化和演变趋势进行预测。结果表明:黄花城水道存在细沙累积性淤积,主要淤积部位较为固定,2012年以前淤积速度、厚度和范围均较大,2012年以后随着上游来沙量减少的趋势渐缓,黄花城水道泥沙淤积速度逐渐减小。

Aiming at the problem of sediment accumulation in Huanghuacheng reach,which is a key sedimentary channel in the backwater area since the impoundment of the Three Gorges Reservoir,and based on the prototype observation data since the impoundment of the Three Gorges Reservoir,we analyze the water level change,sediment erosion and deposition characteristics,typical section erosion and siltation changes and isobath changes of the Huanghuacheng waterway,and predict the channel conditions and evolution trends of the channel.The results show that there is a cumulative siltation of fine sand in the Huanghuacheng waterway,and the main siltation site is relatively fixed;before2012,the deposition rate,thickness and range were relatively large;after2012,with the slowing down of the trend of sediment reduction from the upstream,the sedimentation rate of the Huanghuacheng waterway decreases.