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三峡水库蓄水运行后,荆江河段发生了普遍冲刷,下荆江尾闾七弓岭弯道主流出现撇弯现象。分析了七弓岭弯道的历史演变和形成过程,以及近期岸线、深泓线和河床冲淤的变化,并与已有的丹江口水库蓄水后坝下游撇弯切滩的分析成果进行对比,探究了七弓岭弯道发生撇弯的原因。结果表明,七弓岭弯道撇弯主要和来水来沙量及过程、河道形态及河床地质条件、江湖关系等因素有关。其河道勘测分析成果可为下荆江河道综合整治提供参考。
Three Gorges Reservoir impoundment operation, the Jingjiang River section of a common scour, the main stream of the curve at the foot of the bow arch Qiling downstream phenomenon appears bending. The evolution and formation process of the curve of Qijiaoling bend and the change of scouring and silting of the coastline, shenhong line and riverbed in recent years are analyzed and compared with the analysis results of the cut-off curve downstream of dam after the impoundment of Danjiangkou reservoir , Explored the causes of the bending of the bend at Seven Bowling. The results show that the curve deflection of Qigongling is mainly related to the quantity and process of incoming and outgoing sediment, the shape of the river channel, the geological conditions of the riverbed and the relationship between rivers and lakes. The results of river survey and analysis can provide a reference for the comprehensive regulation of the Jingjiang River.